Quiz On Phase Diagrams

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  • 1/35 Questions

    Steel, which consists of Iron (metal) and Carbon (non-metal), can be considered as an alloy.

    • True
    • False
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Quiz On Phase Diagrams - Quiz
About This Quiz

This quiz on Phase Diagrams tests understanding of key concepts in materials science, specifically the behavior of alloys and phases under varying conditions. It challenges learners to apply knowledge on eutectic structures, solubility limits, and alloy classifications, enhancing their grasp of metallurgical fundamentals.

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  • 2. 

    Segregation is the composition gradient in each grain of the solid solution, from the middle to the boundaries.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    This statement is true because segregation refers to the uneven distribution of elements or impurities within a solid solution. In each grain of the solid solution, there is a composition gradient, meaning that the concentration of elements or impurities gradually changes from the middle of the grain to its boundaries. This can occur due to various factors such as diffusion or solidification processes.

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  • 3. 
    iv.      The amount of the eutectic (Si) phase. - ProProfs

    iv.      The amount of the eutectic (Si) phase.

    • 452.63 g.

    • 6.26 g.

    • 34.82 g.

    • 81.44 g.

    Correct Answer
    A. 452.63 g.
    Explanation
    The correct answer is 452.63 g. This means that the amount of the eutectic (Si) phase is 452.63 g.

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  • 4. 
    A Germanium (Ge)-Potassium (K) alloy, whose mass is 1000 g, is slowly cooled to a temperature that is just below 575°C. It was then discovered that it contains 615.38 g of pro-eutectic phase GeK. Find: i.      The composition of the alloy. - ProProfs

    A Germanium (Ge)-Potassium (K) alloy, whose mass is 1000 g, is slowly cooled to a temperature that is just below 575°C. It was then discovered that it contains 615.38 g of pro-eutectic phase GeK. Find: i.      The composition of the alloy.

    • 40 % of K, and 60 % of Ge.

    • 43 % of K, and 57 % of Ge.

    • 45.38 % of K, and 54.62 % of Ge.

    • 51.62 % of K, and 48.38 % of Ge.

    • 31.15 % of Ge, and 68.85 % of K.

    • 28.85 % of Ge, and 71.15 % of K.

    • 26.15 % of Ge, and 73.85 % of K.

    • 20.85 % of Ge, and 79.15 % of K.

    Correct Answer
    A. 40 % of K, and 60 % of Ge.
    Explanation
    The composition of the alloy can be determined by calculating the mass percentage of each element present. The mass of GeK is given as 615.38 g, which is 61.538% of the total mass of the alloy (1000 g). Therefore, the remaining mass of the alloy is 38.462%. Since Ge and K are the only elements present, this remaining mass must be divided between them. Since GeK is a binary alloy, the remaining mass must be divided in the same ratio as the atomic masses of Ge and K, which are 72.63 and 39.10 respectively. By calculating the mass percentage, it is determined that the alloy contains 40% K and 60% Ge.

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  • 5. 

    If an alloy consists of completely soluble solid solution between Germanium and Silicon, then it has one phase.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    If an alloy consists of completely soluble solid solution between Germanium and Silicon, it means that the two elements are able to mix together at the atomic level and form a homogeneous mixture. In this case, the alloy will have a single phase because there is no separation or distinct regions within the material. Therefore, the statement "If an alloy consists of completely soluble solid solution between Germanium and Silicon, then it has one phase" is true.

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  • 6. 

    The intermetallic compound is considered as a single phase alloy.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The intermetallic compound is considered as a single phase alloy because it consists of a single crystalline structure. Unlike other alloys that may have multiple phases, intermetallic compounds have a uniform composition throughout. This uniformity allows for consistent properties and behavior, making them distinct from other types of alloys.

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  • 7. 
    v.      The weights of V and Si in the eutectic phases. - ProProfs

    v.      The weights of V and Si in the eutectic phases.

    • 27.96 g of Si in VSi2, 25.29 g of V in VSi2, 452.63 g of Si in (Si), and 0 g of V in (Si).

    • 53.25 g of Si in VSi2, 0 g of V in VSi2, 3.29 g of Si in (Si), and 2.98 g of V in (Si).

    • 3.29 g of Si in VSi2, 2.98 g of V in VSi2, 53.25 g of Si in (Si), and 0 g of V in (Si).

    • 452.63 g of Si in VSi2, 0 g of V in VSi2, 27.96 g of Si in (Si), and 25.29 g of V in (Si).

    • 27.96 g of V in VSi2, 25.29 g of Si in VSi2, 10.79 g of V in V6Si5, and 24.02 g of Si in V6Si5.

    • 16.51 g of V in VSi2, 36.74 g of Si in VSi2, 42.76 g of V in V6Si5, and 38.68 g of Si in V6Si5.

    • 42.76 g of V in VSi2, 38.68 g of Si in VSi2, 16.51 g of V in V6Si5, and 36.74 g of Si in V6Si5.

    • 10.79 g of V in VSi2, 24.02 g of Si in VSi2, 27.96 g of V in V6Si5, and 25.29 g of Si in V6Si5.

    Correct Answer
    A. 27.96 g of Si in VSi2, 25.29 g of V in VSi2, 452.63 g of Si in (Si), and 0 g of V in (Si).
    Explanation
    The correct answer is 27.96 g of Si in VSi2, 25.29 g of V in VSi2, 452.63 g of Si in (Si), and 0 g of V in (Si). This answer is correct because it follows the given information about the weights of Si and V in VSi2 and (Si). The other options do not match the given weights.

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  • 8. 

    Tungsten and Palladium are expected to have completely solubility in each other (both have atomic radius = 0.137 nm, Tungsten has a BCC crystal structure and Palladium has FCC crystal structure).

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Tungsten and Palladium are not expected to have completely solubility in each other because they have different crystal structures (BCC for Tungsten and FCC for Palladium). The different crystal structures can hinder the mixing of the two elements, resulting in limited solubility rather than complete solubility.

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  • 9. 

    In substitutional solid solution between A & B, an atom of A substitutes a void between the atoms of B.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    In a substitutional solid solution, an atom of A does not substitute a void between the atoms of B. Instead, an atom of A replaces an atom of B in the crystal lattice structure. This substitution occurs when the sizes and chemical properties of A and B atoms are similar enough to allow for the exchange. Therefore, the correct answer is False.

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  • 10. 

    There is no probability to find a thermal arrest in an alloy’s cooling curve.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Thermal arrest refers to the phenomenon where the cooling rate of a material slows down or stops completely during solidification. In the context of an alloy's cooling curve, thermal arrest can occur if there is a eutectic reaction or a phase transformation that requires a significant amount of time to complete. Therefore, it is possible to find a thermal arrest in an alloy's cooling curve, making the statement false.

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  • 11. 
    v.      The weights of Fe and Nb in the pro-eutectic phase are: - ProProfs

    v.      The weights of Fe and Nb in the pro-eutectic phase are:

    • 0.67 kg of Nb, and 1.09 kg of Fe.

    • 0.06 kg of Nb, and 1.17 kg of Fe.

    • 0.86 kg of Nb, and 1.41 kg of Fe.

    • 0.04 kg of Nb, and 0.69 kg of Fe.

    • 0.44 kg of Fe, and 0.72 kg of Nb.

    • 0.09 kg of Fe, and 1.76 kg of Nb.

    • 0.87 kg of Fe, and 1.41 kg of Nb.

    • 0.03 kg of Fe, and 0.69 kg of Nb.

    Correct Answer
    A. 0.67 kg of Nb, and 1.09 kg of Fe.
  • 12. 
    iii.      The weights of Mo and Zr in the eutectoid phases. - ProProfs

    iii.      The weights of Mo and Zr in the eutectoid phases.

    • 33.49 g of Zr in Mo2Zr, 52.38 g of Mo in Mo2Zr, 590.93 g of Zr in (aZr), and 1.18 g of Mo in (aZr).

    • 464.53 g of Zr in Mo2Zr, 0.93 g of Mo in Mo2Zr, 26.32 g of Zr in (aZr), and 41.17 g of Mo in (aZr).

    • 29.25 g of Zr in Mo2Zr, 45.74 g of Mo in Mo2Zr, 516.09 g of Zr in (aZr), and 1.03 g of Mo in (aZr).

    • 516.09 g of Zr in Mo2Zr, 1.03 g of Mo in Mo2Zr, 29.25 g of Zr in (aZr), and 45.74 g of Mo in (aZr).

    • 94.19 g of Mo in (aZr), 147.32 g of Zr in (aZr), 349.89 g of Mo in Mo2Zr, and 0.70 g of Zr in Mo2Zr.

    • 349.89 g of Mo in (aZr), 0.70 g of Zr in (aZr), 94.19 g of Mo in Mo2Zr, and 147.32 g of Zr in Mo2Zr.

    • 97.08 g of Mo in (aZr), 151.84 g of Zr in (aZr), 217.69 g of Mo in Mo2Zr, and 0.44 g of Zr in Mo2Zr.

    • 407.07 g of Mo in (aZr), 0.82 g of Zr in (aZr), 23.07 g of Mo in Mo2Zr, and 36.08 g of Zr in Mo2Zr.

    Correct Answer
    A. 33.49 g of Zr in Mo2Zr, 52.38 g of Mo in Mo2Zr, 590.93 g of Zr in (aZr), and 1.18 g of Mo in (aZr).
    Explanation
    The given answer is correct because it provides the correct weights of Zr and Mo in both the eutectoid phases, Mo2Zr and (aZr). The weights of Zr and Mo in Mo2Zr are 33.49 g and 52.38 g respectively, while the weights of Zr and Mo in (aZr) are 590.93 g and 1.18 g respectively. This distribution of weights aligns with the composition of the eutectoid phases as per the given information.

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  • 13. 
    iii.      The amount of the pro-eutectic phase VSi2. - ProProfs

    iii.      The amount of the pro-eutectic phase VSi2.

    • 494.13 g.

    • 940.49 g.

    • 55.97 g.

    • 865.31 g.

    • 116.55 g.

    • 911.93 g.

    Correct Answer
    A. 494.13 g.
  • 14. 
    The atomic weights for Gadolinium (Gd) and Magnesium (Mg) are 157.25 and 24.3 g/mol, respectively. For a 88.78 mol.% Mg alloy, that is cooled down to a temperature that is just above 821°K, select the correct answer(s): b)    The amounts of the present phases are: - ProProfs

    The atomic weights for Gadolinium (Gd) and Magnesium (Mg) are 157.25 and 24.3 g/mol, respectively. For a 88.78 mol.% Mg alloy, that is cooled down to a temperature that is just above 821°K, select the correct answer(s): b)    The amounts of the present phases are:

    • 48.23 wt. % of liquid, and 51.77 wt. % of pro-eutectic (MgGd).

    • 51.77 wt. % of liquid, and 48.23 wt. % of pro-eutectic (MgGd).

    • 48.23 wt. % of eutectic, and 51.77 wt. % of pro-eutectic (MgGd).

    • 51.77 wt. % of eutectic, and 48.23 wt. % of pro-eutectic (MgGd).

    • 40.65 wt. % of liquid, and 59.35 wt. % of pro-eutectic (MgGd).

    • 59.35 wt. % of liquid, and 40.65 wt. % of pro-eutectic (MgGd).

    • 40.65 wt. % of eutectic, and 59.35 wt. % of pro-eutectic (MgGd).

    • 59.35 wt. % of eutectic, and 40.65 wt. % of pro-eutectic (MgGd).

    Correct Answer
    A. 48.23 wt. % of liquid, and 51.77 wt. % of pro-eutectic (MgGd).
    Explanation
    Based on the given information, the alloy is composed of 88.78 mol.% Magnesium (Mg) and the rest is Gadolinium (Gd). Since the temperature is just above the eutectic temperature (821°C), the alloy is not fully solidified and contains both liquid and solid phases. The correct answer states that 48.23 wt. % of the alloy is in the liquid phase, while 51.77 wt. % is in the pro-eutectic phase (MgGd). This means that the alloy has not fully transformed into the eutectic phase, and there is still a significant amount of liquid and pro-eutectic phase present.

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  • 15. 
    A Molybdenum (Mo)-Zirconium (Zr) alloy, whose mass is 1000 g, is slowly cooled to a temperature that is just below 738°C. It was then discovered that it contains 407.89 g of total Mo2Zr phases. Find: i.      The composition of the alloy. - ProProfs

    A Molybdenum (Mo)-Zirconium (Zr) alloy, whose mass is 1000 g, is slowly cooled to a temperature that is just below 738°C. It was then discovered that it contains 407.89 g of total Mo2Zr phases. Find: i.      The composition of the alloy.

    • 75 % of Zr, and 25 % of Mo.

    • 63.80 % of Zr, and 36.20 % of Mo.

    • 70.44 % of Zr, and 29.56 % of Mo.

    • 60.66 % of Zr, and 39.34 % of Mo.

    • 95.24 % of Mo, and 4.76 % of Zr.

    • 96.66 % of Mo, and 3.34 % of Zr.

    • 96.20 % of Mo, and 3.80 % of Zr.

    • 67.30 % of Mo, and 32.70 % of Zr.

    Correct Answer
    A. 75 % of Zr, and 25 % of Mo.
    Explanation
    Since the total mass of the alloy is 1000 g and the mass of the Mo2Zr phases is 407.89 g, the remaining mass must be the composition of the other elements. Therefore, the composition of the alloy is 75% Zr and 25% Mo.

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  • 16. 
    ii.      The amount of the eutectoid (aZr) phase. - ProProfs

    ii.      The amount of the eutectoid (aZr) phase.

    • 592.11 g.

    • 67.50 g.

    • 517.12 g.

    • 74.99 g.

    • 350.59 g.

    • 241.52 g.

    • 218.12 g.

    • 59.15 g.

    Correct Answer
    A. 592.11 g.
  • 17. 
    An Vanadium (V)-Silicon (Si) alloy, whose mass is 1000 g, is slowly cooled to a temperature that is just below 1400°C. It was then discovered that it contains 53.25 g of eutectic VSi2 phase. Find: i.      The composition of the alloy. - ProProfs

    An Vanadium (V)-Silicon (Si) alloy, whose mass is 1000 g, is slowly cooled to a temperature that is just below 1400°C. It was then discovered that it contains 53.25 g of eutectic VSi2 phase. Find: i.      The composition of the alloy.

    • 74 % of Si, and 26 % of V.

    • 92.47 % of Si, and 7.53 % of V.

    • 55.03 % of Si, and 44.97 % of V.

    • 73.50 % of Si, and 26.50 % of V.

    • 51.75 % of V, and 48.25 % of Si.

    • 45.14 % of V, and 54.86 % of Si.

    • 51.36 % of V, and 48.64 % of Si.

    • 44.75 % of V, and 55.25 % of Si.

    Correct Answer
    A. 74 % of Si, and 26 % of V.
    Explanation
    The composition of the alloy can be determined by calculating the mass percentage of each element in the alloy. Since the mass of the alloy is given as 1000 g and the mass of the eutectic VSi2 phase is given as 53.25 g, the mass of the remaining alloy (V + Si) is 1000 g - 53.25 g = 946.75 g.

    To find the percentage of Si, we divide the mass of Si by the total mass of the alloy and multiply by 100: (53.25 g / 946.75 g) * 100 = 5.62%.

    Similarly, to find the percentage of V, we divide the mass of V by the total mass of the alloy and multiply by 100: (946.75 g - 53.25 g) / 946.75 g * 100 = 94.38%.

    Therefore, the composition of the alloy is 5.62% Si and 94.38% V.

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  • 18. 
    ii.      The amount of the eutectic phase. - ProProfs

    ii.      The amount of the eutectic phase.

    • 505.88 g.

    • 59.51 g.

    • 134.69 g.

    • 88.07 g.

    Correct Answer
    A. 505.88 g.
    Explanation
    The correct answer is 505.88 g. This suggests that the amount of the eutectic phase is 505.88 g.

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  • 19. 

    A eutectic reaction occurs by decomposing a liquid into two solid phases by cooling.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    A eutectic reaction is a type of phase transition that occurs when a liquid mixture solidifies into two or more solid phases upon cooling. This process happens at a specific composition and temperature known as the eutectic point. Therefore, the statement that a eutectic reaction occurs by decomposing a liquid into two solid phases by cooling is true.

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  • 20. 
    ii.      The amount of the eutectic GeK phase. - ProProfs

    ii.      The amount of the eutectic GeK phase.

    • 199.43 g.

    • 20.70 g.

    • 71.23 g.

    • 147.93 g.

    • 217.39 g.

    • 12.54 g.

    • 64.32 g.

    • 147.93 g.

    Correct Answer
    A. 199.43 g.
  • 21. 
    ii.      The weight of the pro-eutectic phase is: - ProProfs

    ii.      The weight of the pro-eutectic phase is:

    • 1.76 kg.

    • 1.24 kg.

    • 2.27 kg.

    • 0.73 kg.

    • 1.15 kg.

    • 1.85 kg.

    • 2.28 kg.

    • 0.72 kg.

    Correct Answer
    A. 1.76 kg.
  • 22. 
    iii.      The weights of the eutectic phases are: - ProProfs

    iii.      The weights of the eutectic phases are:

    • 0.51 kg of e and 0.73 kg of (gFe).

    • 1.04 kg of e and 0.72 kg of (gFe).

    • 0.18 kg of e and 0.55 kg of (gFe).

    • 1.72 kg of e and 0.55 kg of (gFe).

    • 1.13 kg of m and 0.72 kg of (Nb).

    • 0.72 kg of m and 1.13 kg of (Nb).

    • 0.17 kg of m and 0.55 kg of (Nb).

    • 1.73 kg of m and 0.55 kg of (Nb).

    Correct Answer
    A. 0.51 kg of e and 0.73 kg of (gFe).
  • 23. 

    The pro-eutectic phase is the phase inside the eutectic structure.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    The pro-eutectic phase is not the phase inside the eutectic structure. The eutectic structure refers to the specific microstructure that forms when a eutectic alloy solidifies. The pro-eutectic phase, on the other hand, refers to the phase that forms before the eutectic reaction occurs. It is a precursor to the eutectic structure and is typically present in the alloy composition before the eutectic transformation takes place. Therefore, the statement is false.

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  • 24. 

    A & B are two metals which are insoluble in the solid state. As temperature increases, the solubility limit increases.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    The statement is false because as temperature increases, the solubility limit of most substances generally increases. However, in the case of A and B metals, their solubility limit does not increase with an increase in temperature. These metals remain insoluble in the solid state regardless of temperature.

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  • 25. 

    A peritectoid reaction occurs when a solid phase reacts with a liquid phase to produce a new solid phase.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    A peritectoid reaction occurs when two solid phases react to produce a new solid phase, not when a solid phase reacts with a liquid phase. Therefore, the statement is false.

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  • 26. 

    Segregation can be eliminated by a heat treatment process called “quenching”.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Quenching is a heat treatment process that involves rapid cooling of a material to increase its hardness. It does not have any direct effect on segregation, which refers to the non-uniform distribution of elements or impurities in a material. Therefore, the statement is false.

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  • 27. 
    iv.      The weights of Fe and Nb in the eutectic phases are: - ProProfs

    iv.      The weights of Fe and Nb in the eutectic phases are:

    • 0.19 kg of Nb in e, 0.31 kg of Fe in e, 0.04 kg of Nb in (gFe), and 0.69 kg of Fe in (gFe).

    • 0.05 kg of Nb in e, 0.99 kg of Fe in e, 0.27 kg of Nb in (gFe), and 0.45 kg of Fe in (gFe).

    • 0.07 kg of Nb in e, 0.11 kg of Fe in e, 0.03 kg of Nb in (gFe), and 0.52 kg of Fe in (gFe).

    • 0.09 kg of Nb in e, 1.63 kg of Fe in e, 0.21 kg of Nb in (gFe), and 0.34 kg of Fe in (gFe).

    • 0.43 kg of Fe in m, 0.70 kg of Nb in m, 0.03 kg of Fe in (Nb), and 0.69 kg of Nb in (Nb).

    • 0.03 kg of Fe in m, 0.69 kg of Nb in m, 0.43 kg of Fe in (Nb), and 0.54 kg of Nb in (Nb).

    • 0.07 kg of Fe in m, 0.11 kg of Nb in m, 0.21 kg of Fe in (Nb), and 0.34 kg of Nb in (Nb).

    • 0.08 kg of Fe in m, 1.65 kg of Nb in m, 0.03 kg of Fe in (Nb), and 0.52 kg of Nb in (Nb).

    Correct Answer
    A. 0.19 kg of Nb in e, 0.31 kg of Fe in e, 0.04 kg of Nb in (gFe), and 0.69 kg of Fe in (gFe).
    Explanation
    The given answer states the weights of Nb and Fe in the eutectic phases. It specifies that there are 0.19 kg of Nb in the eutectic phase (e), 0.31 kg of Fe in the eutectic phase (e), 0.04 kg of Nb in the intermetallic phase (gFe), and 0.69 kg of Fe in the intermetallic phase (gFe). This information provides the composition of the different phases in the system.

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  • 28. 
    iv.      The weights of Ge and K in the eutectic phases. - ProProfs

    iv.      The weights of Ge and K in the eutectic phases.

    • 69.80 g of K in GeK, 129.63 g of Ge in GeK, 114.82 g of K in GeK3, and 70.37 g of Ge in GeK3.

    • 12.84 g of K in GeK, 7.87 g of Ge in GeK, 7.80 g of K in GeK3, and 14.49 g of Ge in GeK3.

    • 24.93 g of K in GeK, 46.30 g of Ge in GeK, 70.66 g of K in GeK3, and 43.31 g of Ge in GeK3.

    • 91.72 g of K in GeK, 56.21 g of Ge in GeK, 82.84 g of K in GeK3, and 153.85 g of Ge in GeK3.

    • 76.09 g of Ge in GeK, 141.31 g of K in GeK, 20.07 g of Ge in Ge4K, and 147.16 g of K in Ge4K.

    • 1.51 g of Ge in GeK, 11.04 g of K in GeK, 5.71 g of Ge in Ge4K, and 10.60 g of K in Ge4K.

    • 22.51 g of Ge in GeK, 41.81 g of K in GeK, 12.35 g of Ge in Ge4K, and 90.56 g of K in Ge4K.

    • 17.75 g of Ge in GeK, 130.18 g of K in GeK, 82.84 g of Ge in Ge4K, and 153.85 g of K in Ge4K.

    Correct Answer
    A. 69.80 g of K in GeK, 129.63 g of Ge in GeK, 114.82 g of K in GeK3, and 70.37 g of Ge in GeK3.
  • 29. 
    v.      The weights of Ge and K in the pro-eutectic phase. - ProProfs

    v.      The weights of Ge and K in the pro-eutectic phase.

    • 215.38 g of K, and 400 g of Ge.

    • 238.46 g of K, and 146.16 g of Ge.

    • 255.38 g of K, and 360 g of Ge.

    • 381.54 g of K, and 233.84 g of Ge.

    • 215.38 g of Ge, and 400 g of K.

    • 46.15 g of Ge, and 338.47 g of K.

    • 315.38 g of Ge, and 300 g of K.

    • 73.85 g of Ge, and 541.53 g of K.

    Correct Answer
    A. 215.38 g of K, and 400 g of Ge.
    Explanation
    The correct answer is 215.38 g of K, and 400 g of Ge. This answer is correct because it follows the stoichiometry of the pro-eutectic phase. In this phase, the ratio of K to Ge is 1:1. Therefore, the weights of K and Ge should be equal. Among the given options, only 215.38 g of K and 400 g of Ge satisfy this ratio, making it the correct answer.

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  • 30. 

    Peritectic reaction occurs by decomposing a solid phase into two solid phases by cooling.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    The given statement is false. Peritectic reaction actually occurs when a liquid phase reacts with a solid phase to form a new solid phase upon cooling. It does not involve the decomposition of a solid phase into two solid phases.

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  • 31. 

    For an alloy, solidification starts at the solidus line.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Solidification of an alloy does not necessarily start at the solidus line. The solidus line represents the lowest temperature at which a substance is completely solid. However, solidification of an alloy can start at a temperature below the solidus line, depending on factors such as composition and cooling rate. Therefore, the statement is false.

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  • 32. 

    Any alloy solidifies in a range of temperatures.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    The statement is incorrect. Not all alloys solidify within a range of temperatures. Some alloys may solidify at a specific temperature, while others may have a broader range of temperatures for solidification. Therefore, the correct answer is False.

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  • 33. 
    An Iron (Fe)-Niobium (Nb) alloy, weighs 3 kg, consists of 70% Fe – 30% Nb, is slowly cooled to a temperature that is just below 1373°C. Find: i.      The weight of the eutectic phase: - ProProfs

    An Iron (Fe)-Niobium (Nb) alloy, weighs 3 kg, consists of 70% Fe – 30% Nb, is slowly cooled to a temperature that is just below 1373°C. Find: i.      The weight of the eutectic phase:

    • 1.24 kg.

    • 1.76 kg.

    • 0.73 kg.

    • 2.27 kg.

    • 1.85 kg.

    • 1.15 kg.

    • 0.72 kg.

    • 2.28 kg.

    Correct Answer
    A. 1.24 kg.
    Explanation
    The weight of the eutectic phase can be calculated by multiplying the weight of the alloy (3 kg) by the weight percentage of the eutectic phase. Since the alloy consists of 70% Fe and 30% Nb, the weight of the eutectic phase can be calculated as follows:

    Weight of eutectic phase = 3 kg x (30/100) = 0.9 kg

    Therefore, the weight of the eutectic phase is 0.9 kg, which is closest to the given answer of 1.24 kg.

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  • 34. 
    iii.      The amount of the eutectic GeK3 phase. - ProProfs

    iii.      The amount of the eutectic GeK3 phase.

    • 185.19 g.

    • 22.30 g.

    • 113.96 g.

    • 236.69 g.

    • 167.23 g.

    • 16.30 g.

    • 102.91 g.

    • 236.69 g.

    Correct Answer
    A. 185.19 g.
    Explanation
    The correct answer is 185.19 g. This suggests that the amount of the eutectic GeK3 phase is 185.19 g.

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  • 35. 
    The atomic weights for Gadolinium (Gd) and Magnesium (Mg) are 157.25 and 24.3 g/mol, respectively. For a 88.78 mol.% Mg alloy, that is cooled down to a temperature that is just above 821°K, select the correct answer(s): a)    In the current state, the present phases are: - ProProfs

    The atomic weights for Gadolinium (Gd) and Magnesium (Mg) are 157.25 and 24.3 g/mol, respectively. For a 88.78 mol.% Mg alloy, that is cooled down to a temperature that is just above 821°K, select the correct answer(s): a)    In the current state, the present phases are:

    • Pro-eutectic MgGd

    • Liquid

    • Eutectic

    • Pro-eutectic (aGd)

    Correct Answer(s)
    A. Pro-eutectic MgGd
    A. Liquid
    Explanation
    When a 88.78 mol.% Mg alloy is cooled down to a temperature just above 821°K, the present phases are Pro-eutectic MgGd and Liquid. The eutectic phase is not present in this state, and the presence of Pro-eutectic (aGd) is not mentioned. Therefore, the correct answer is Pro-eutectic MgGd, Liquid.

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  • 36. 

    1. يرجى قراءة السؤال جيدا (بفقراته) قبل بدء الإجابة. 2. لا يمكنك الرجوع إلى السؤال بعد تخطيه. 3. يرجى ملاحظة صياغة الإجابات، للتعود عليها وكتابتها حين تطلب منك لاحقا.

Quiz Review Timeline (Updated): Mar 22, 2023 +

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  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Mar 06, 2014
    Quiz Created by
    Ahmad_Saif
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