Chemical Reactions And Equations
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The electrolytic decomposition of water gives H2 and O2 in the ratio of
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1:2 by volume
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2:1 by volume
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8:1 by mass
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1:2 by mass
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Explore the fundamentals of chemical reactions and equations through this quiz. Assess your understanding of reaction outcomes, decomposition processes, and formula validation. Ideal for students enhancing their chemistry knowledge.
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- 2.
The chemical formula of lead sulphate is Pb(SO4)2
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True
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False
Correct Answer
A. FalseExplanation
The correct chemical formula for lead sulphate is PbSO4, not Pb(SO4)2. The number 2 after the parenthesis indicates that there are two sulfate ions, which is incorrect. The correct formula should have only one sulfate ion, represented by the SO4 group.Rate this question:
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- 3.
In a chemical reaction between sulphuric acid and barium chloride solution the white precipitates formed are of
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Hydrochloric acid
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Barium sulphate
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Chlorine
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Sulphur
Correct Answer
A. Barium sulphateExplanation
When sulphuric acid reacts with barium chloride solution, it forms a white precipitate of barium sulphate. This is because sulphuric acid reacts with barium chloride to produce barium sulphate, which is insoluble in water and appears as a white solid. The other options, hydrochloric acid, chlorine, and sulphur, are not formed as precipitates in this reaction.Rate this question:
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- 4.
A chemical reaction does not involve:
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Formation of new substances having entirely different properties than that of the reactants
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Breaking of old chemical bonds and formation of new chemical bonds
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Changing of the atoms of on element into those of another element to form new products
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Rearrangement of the atoms of reactants to form new products
Correct Answer
A. Changing of the atoms of on element into those of another element to form new productsExplanation
A chemical reaction does not involve changing the atoms of one element into those of another element to form new products. Chemical reactions involve the rearrangement of atoms and the breaking and formation of chemical bonds, but they do not result in a change in the identity of the elements involved.Rate this question:
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- 5.
On decomposition of lead nitrate ________ gas (write name) is evolved which is ________ in colour.
Correct Answer
NItrogen Dioxide
BrownExplanation
When lead nitrate is decomposed, nitrogen dioxide gas is evolved. Nitrogen dioxide gas is known to be brown in color.Rate this question:
- 6.
Which of the following product is formed when calcium oxide reacts with water?
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Slaked lime
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Carbon dioxide
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Calcium oxide
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Oxygen gas
Correct Answer
A. Slaked limeExplanation
Calcium oxide (CaO) reacts with water (H2O) to form calcium hydroxide (Ca(OH)2), also known as slaked lime. This reaction is exothermic and produces a white, powdery substance. Slaked lime is commonly used in construction, agriculture, and chemical industries for various purposes such as soil stabilization, water treatment, and manufacturing of cement and mortar. It is not carbon dioxide, calcium oxide, or oxygen gas as these are not the products of the reaction between calcium oxide and water.Rate this question:
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- 7.
What happens when carbon dioxide is passed in lime water?
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Lime water turns milky because of formation of water
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Lime water turns milky because of formation of calcium carbonate
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Lime water turns red because of formation permanganate
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Lime water turns red because of formation of copper sulphate
Correct Answer
A. Lime water turns milky because of formation of calcium carbonateExplanation
When carbon dioxide is passed in lime water, it reacts with the calcium hydroxide present in lime water to form calcium carbonate. This reaction results in the formation of a white precipitate, which causes the lime water to turn milky. Calcium carbonate is insoluble in water, hence it appears as a solid precipitate, giving the milky appearance to the lime water.Rate this question:
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- 8.
What happens when Copper metal is dipped in the solution of zinc sulphate?
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Copper sulphate is formed
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Zinc metal is separated
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Oxygen gas is formed
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No reaction takes place
Correct Answer
A. No reaction takes placeExplanation
When Copper metal is dipped in the solution of zinc sulphate, no reaction takes place. This is because copper is less reactive than zinc in the reactivity series. Therefore, copper does not displace zinc from its compound (zinc sulphate) to form a new compound. Hence, there is no chemical change or reaction observed in this scenario.Rate this question:
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- 9.
Which of the following is termed as rancidity?
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Reduction of oxygen present in food
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Oxidation of sugar present in food
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Oxidation of oil present in food
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All of the above
Correct Answer
A. Oxidation of oil present in foodExplanation
Rancidity refers to the spoilage of food due to the oxidation of fats or oils present in it. When fats or oils are exposed to oxygen, they undergo a chemical reaction called oxidation, resulting in the development of unpleasant flavors and odors. This process is known as rancidity. Therefore, the correct answer is "Oxidation of oil present in food."Rate this question:
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- 10.
The following reactions is an example of
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Redox reaction
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Electrolytic decomposition
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Thermal decomposition
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Photolytic decomposition
Correct Answer
A. Thermal decompositionExplanation
Thermal decomposition refers to a reaction in which a compound breaks down into simpler substances due to the application of heat. In this type of reaction, the compound undergoes a chemical change as a result of the heat energy absorbed, leading to the formation of new products. Therefore, the given reaction is an example of thermal decomposition as it involves the breakdown of a compound through the application of heat.Rate this question:
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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
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Current Version
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Feb 23, 2023Quiz Edited by
ProProfs Editorial Team -
Apr 11, 2020Quiz Created by
Neeraj Punia
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