Chemical Reaction And Equation Quiz!

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Chemical Reaction And Equation Quiz! - Quiz

How good are you at chemistry? Play this informative quiz on Chemical Reactions and Equations to find the answer. This quiz contains various questions ranging from easy, medium to a high level that will help you ace the concepts. Do you know what happens when a copper rod is dipped in an iron sulfate solution? What is the most reactive metal? Get answers to all this and much more in this quiz. All the best!


Questions and Answers
  • 1. 

    Chemically rust is:

    • A.

      Hydrated ferrous oxide

    • B.

      Only ferric oxide

    • C.

      Hydrated ferric oxide

    • D.

      None of these

    Correct Answer
    C. Hydrated ferric oxide
    Explanation
    Rust is a reddish-brown substance that forms on iron or steel when it reacts with oxygen and water. It is a compound known as iron oxide, specifically ferric oxide. The term "hydrated" indicates that water molecules are also present in the compound. Therefore, the correct answer is "Hydrated ferric oxide."

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  • 2. 

    Both CO2 and H2 gases are:

    • A.

      Heavier than air

    • B.

      Colourless

    • C.

      Acidic in nature

    • D.

      Soluble in water

    Correct Answer
    B. Colourless
    Explanation
    Both CO2 and H2 gases are colourless because they do not have any pigments or dyes that would give them a distinct color. Color is determined by the absorption and reflection of light, and since these gases do not interact with light in a way that produces color, they appear colorless to the human eye.

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  • 3. 

    Fatty food becomes rancid due to the process of:

    • A.

      Oxidation

    • B.

      Corresion

    • C.

      Reduction

    • D.

      Hydrogenetion

    Correct Answer
    A. Oxidation
    Explanation
    Fatty food becomes rancid due to the process of oxidation. Oxidation occurs when the fats in the food react with oxygen in the air, causing them to break down and produce unpleasant odors and flavors. This process is accelerated by factors such as heat, light, and exposure to air. As a result, the food becomes rancid and unfit for consumption.

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  • 4. 

    We store silver chloride in a dark-colored bottle because it is:

    • A.

      A white solid

    • B.

      Undergoes redox reaction

    • C.

      To avoid action of sunlight

    • D.

      None of these

    Correct Answer
    C. To avoid action of sunlight
    Explanation
    Silver chloride is stored in a dark-colored bottle to avoid the action of sunlight. Sunlight can cause the decomposition of silver chloride, leading to the formation of silver metal and chlorine gas. By storing it in a dark-colored bottle, the entry of sunlight is restricted, minimizing the decomposition reaction and preserving the integrity of the silver chloride.

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  • 5. 

    When a magnesium ribbon is burnt in the air, the ash formed is:

    • A.

      Black

    • B.

      White

    • C.

      Yellow

    • D.

      Pink

    Correct Answer
    B. White
    Explanation
    When a magnesium ribbon is burnt in the air, it undergoes a chemical reaction with oxygen to form magnesium oxide. Magnesium oxide is a white powdery substance, which is the ash formed when magnesium burns. Therefore, the correct answer is white.

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  • 6. 

    In which of the following heat energy will be evolved?

    • A.

      Electrolysis of water

    • B.

      Dissolution of NH4Cl in water

    • C.

      Burning of L.P.G.

    • D.

      Decomposition of AgBr in presence of sunlight

    Correct Answer
    C. Burning of L.P.G.
    Explanation
    Burning of L.P.G. will result in the evolution of heat energy because it is a combustion reaction. When L.P.G. (liquefied petroleum gas) is burned, it reacts with oxygen in the air to produce carbon dioxide and water vapor, releasing a large amount of heat energy in the process. This is an exothermic reaction where energy is released in the form of heat.

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  • 7. 

    Rancidity can be prevented by:

    • A.

      Adding antioxidants

    • B.

      Storing food away from the light

    • C.

      Keeping food in refrigeretor

    • D.

      All of these

    Correct Answer
    D. All of these
    Explanation
    Rancidity refers to the spoilage of food due to the oxidation of fats. Adding antioxidants helps prevent rancidity by inhibiting the oxidation process. Storing food away from light is also important as light exposure can accelerate the oxidation process. Keeping food in the refrigerator slows down the rate of oxidation by reducing the temperature and inhibiting the growth of microorganisms. Therefore, all of these methods contribute to preventing rancidity.

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  • 8. 

    The reaction of H2 gas with oxygen gas to form water is an example of:

    • A.

      Combination reaction 

    • B.

      Redox reaction

    • C.

      Exothermic reaction

    • D.

      All of these reaction

    Correct Answer
    D. All of these reaction
    Explanation
    The reaction of H2 gas with oxygen gas to form water is an example of a combination reaction because two substances are combining to form a single product. It is also a redox reaction because there is a transfer of electrons between the reactants. Additionally, it is an exothermic reaction because it releases heat energy. Therefore, the correct answer is "All of these reactions" as the given reaction exhibits characteristics of all three types of reactions.

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  • 9. 

    The reaction in which two compound exchange their ions to form two new compounds is called:

    • A.

      Displacement reaction

    • B.

      Combination reaction

    • C.

      Double displacement reaction

    • D.

      Redox reaction

    Correct Answer
    C. Double displacement reaction
    Explanation
    A double displacement reaction is a type of chemical reaction where two compounds exchange their ions to form two new compounds. In this reaction, the positive ions of one compound combine with the negative ions of the other compound, and vice versa. This results in the formation of two new compounds with different combinations of ions. Double displacement reactions often occur in aqueous solutions and are characterized by the formation of a precipitate, gas, or water.

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  • 10. 

    An element X on exposure to moist air turns reddish-brown and a new compound Y is formed. The substance X and Y are

    • A.

      X=Fe, Y=Fe2O2

    • B.

      X=Ag, Y=Ag2s

    • C.

      X=Cu, Y=CuO

    • D.

      X=Al, Y=Al2O3

    Correct Answer
    A. X=Fe, Y=Fe2O2
    Explanation
    When iron (Fe) is exposed to moist air, it undergoes a chemical reaction with oxygen (O2) to form a reddish-brown compound called iron(II) oxide (Fe2O2). This compound is commonly known as rust. Therefore, the element X is Fe and the compound Y is Fe2O2.

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  • 11. 

    Before burning in air, the magnesium ribbon is cleaned by rubbing with a sandpaper to:

    • A.

      Make the ribbon surface shinier

    • B.

      Remove the layer of magnesium oxide from the ribbon surface

    • C.

      Remove the layer of magnesium carbonate from the ribbon surface

    • D.

      Remove the moisture from the ribbon surface

    Correct Answer
    B. Remove the layer of magnesium oxide from the ribbon surface
    Explanation
    When magnesium is exposed to air, it rapidly reacts with oxygen to form a layer of magnesium oxide on its surface. This layer of oxide can hinder the combustion process when the ribbon is burned. By rubbing the ribbon with sandpaper, the layer of magnesium oxide is physically removed, exposing a fresh surface of magnesium that can react more readily with oxygen during combustion. This allows for a more efficient and complete burning of the magnesium ribbon.

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  • 12. 

    In a chemical reaction between sulphuric acid and barium chloride solution, the white precipitates formed are of:

    • A.

      Hydrochloric acid

    • B.

      Barium sulphate

    • C.

      Chlorine

    • D.

      Sulphur

    Correct Answer
    B. Barium sulphate
    Explanation
    When sulphuric acid reacts with barium chloride solution, it forms white precipitates of barium sulphate. This is because sulphuric acid reacts with barium chloride to produce barium sulphate as a solid product. The formation of white precipitates confirms the presence of barium sulphate in the reaction.

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  • 13. 

    The respiration process during which glucose undergoes slow combustion by combining with oxygen in the cells of our body to produce energy is a kind of:

    • A.

      Exothermic process

    • B.

      Endothermic process

    • C.

      Reversible

    • D.

      Physical process

    Correct Answer
    A. Exothermic process
    Explanation
    The respiration process described in the question involves the combustion of glucose, a chemical reaction that releases energy. This energy is produced by combining glucose with oxygen in the cells of our body. Since this process releases energy in the form of heat, it is classified as an exothermic process.

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  • 14. 

    A chemical reaction does not involve:

    • A.

      Formation of new substances having entirely different properties than that of the  reactants

    • B.

      Breaking of old chemical bonds and formation of new chemical bonds

    • C.

      Rearrangement of the atoms of reactants to form new products

    • D.

      Changing of the atoms of on element into those of another element to form new  products

    Correct Answer
    D. Changing of the atoms of on element into those of another element to form new  products
    Explanation
    A chemical reaction involves the formation of new substances with different properties, the breaking and formation of chemical bonds, and the rearrangement of atoms to form new products. However, it does not involve changing the atoms of one element into those of another element to form new products. This process is known as nuclear transmutation, which is not a part of a chemical reaction.

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  • 15. 

    One of the following processes does not involve a chemical reaction. That is:

    • A.

      Melting of candle wax when heated

    • B.

      Burning of candle wax when heated

    • C.

      Digestion of food in our stomach

    • D.

      Ripening of banana

    Correct Answer
    A. Melting of candle wax when heated
    Explanation
    The process of melting candle wax when heated does not involve a chemical reaction. Melting is a physical change where the wax changes from a solid to a liquid state due to the application of heat. No new substances are formed during this process. In contrast, burning of candle wax involves a chemical reaction called combustion, where the wax reacts with oxygen in the air to produce heat, light, carbon dioxide, and water vapor. Digestion of food in our stomach and ripening of banana also involve chemical reactions as they involve the breakdown of complex molecules into simpler ones.

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  • 16. 

    It is necessary to balance a chemical equation in order to satisfy the law of:

    • A.

      Conservation of motion

    • B.

      Conservation of momentum

    • C.

      Conservation of energy

    • D.

      Conservation of mass

    Correct Answer
    D. Conservation of mass
    Explanation
    When balancing a chemical equation, the number of atoms on both sides of the equation must be equal. This is because the law of conservation of mass states that mass can neither be created nor destroyed in a chemical reaction, it can only be rearranged. Balancing the equation ensures that the same number and type of atoms are present on both sides, thus satisfying the law of conservation of mass.

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  • 17. 

    You are given the following chemical reaction, this reaction represent:

    • A.

      Combination reaction as well as double displacement reaction

    • B.

      Redox reaction as well as displacement reaction

    • C.

      Double displacement reaction as well as redox reaction

    • D.

      Decomposition reaction as well as displacement reaction

    Correct Answer
    B. Redox reaction as well as displacement reaction
    Explanation
    The given chemical reaction is classified as a redox reaction because there is a transfer of electrons between the reactants. Additionally, it is also classified as a displacement reaction because one element is replaced by another element in the reaction. Therefore, the correct answer is "Redox reaction as well as displacement reaction."

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  • 18. 

    When ferrous sulfate is heated strongly it undergoes decomposition to form ferric oxide as a main product accompanied by a change in color from:

    • A.

      Blue to green

    • B.

      Green to blue

    • C.

      Green to Brown

    • D.

      Brown to green

    Correct Answer
    C. Green to Brown
    Explanation
    When ferrous sulfate is heated strongly, it undergoes decomposition to form ferric oxide as the main product. The change in color from green to brown is observed during this reaction. This change in color is due to the conversion of the green ferrous sulfate into brown ferric oxide.

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  • 19. 

    Which of the following gases is used in the storage of fat and oil-containing foods for a long time?

    • A.

      Carbondioxide gas

    • B.

      Nitrogen 

    • C.

      Oxygen

    • D.

      Neon

    Correct Answer
    B. Nitrogen 
    Explanation
    Nitrogen gas is used in the storage of fat and oil-containing foods for a long time. This is because nitrogen is an inert gas, meaning it does not react with the food or cause any chemical changes. By replacing the oxygen in the storage environment with nitrogen, the food is protected from oxidation, which can lead to spoilage. Nitrogen also helps to maintain the freshness and quality of the food by preventing the growth of bacteria and other microorganisms.

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  • 20. 

    Following is given a diagram showing an experimental set-up, The given set-up is used to carry out:

    • A.

      Distillation of water

    • B.

      Purification of water

    • C.

      Electrolysis of water 

    • D.

      Hydrolysis

    Correct Answer
    C. Electrolysis of water 
    Explanation
    The given set-up is used for electrolysis of water. Electrolysis is a process in which an electric current is passed through a substance, causing a chemical reaction to occur. In this case, water is being electrolyzed, which means that the water molecules are being broken down into hydrogen and oxygen gases. This is achieved by passing an electric current through the water using the electrodes shown in the diagram. The hydrogen gas is collected at the cathode (negative electrode), while the oxygen gas is collected at the anode (positive electrode).

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  • 21. 

    The displacement reaction between iron (III) oxide and a metal X is used for welding the rail tracks. Here X is:

    • A.

      Copper granules

    • B.

      Magnesium ribbon

    • C.

      Sodium pellets

    • D.

      Aluminium dust

    Correct Answer
    D. Aluminium dust
    Explanation
    Aluminium dust is the correct answer because it can undergo a displacement reaction with iron (III) oxide to produce iron and aluminium oxide. This reaction releases a large amount of heat, making it suitable for welding rail tracks. Copper granules, magnesium ribbon, and sodium pellets do not have the ability to displace iron from its oxide, so they would not be suitable for this purpose.

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  • 22. 

    The neutralization reaction between an acid and a base is a type of:

    • A.

      Double displacement reaction

    • B.

      Displacement reaction

    • C.

      Addition reaction

    • D.

      Decomposition reaction

    Correct Answer
    A. Double displacement reaction
    Explanation
    In a neutralization reaction, an acid reacts with a base to form a salt and water. This reaction involves the exchange of ions between the acid and the base, resulting in the formation of a new compound. This process is known as a double displacement reaction, as the positive ions from the acid combine with the negative ions from the base to form the salt. Therefore, the correct answer is double displacement reaction.

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  • 23. 

    The chemical reaction between Hydrogen sulfide and iodine to give Hydrogen iodide and sulfur is given below. The reducing and oxidizing agents involved in this redox reaction are:

    • A.

       Iodine and sulphur respectively

    • B.

       Iodine and hydrogen sulphide respectively

    • C.

      Sulphur and iodine respectively

    • D.

      Hydrogen sulphide and sulphur

    Correct Answer
    B.  Iodine and hydrogen sulphide respectively
    Explanation
    In this redox reaction, hydrogen sulfide is oxidized to sulfur, which means it loses electrons and is the reducing agent. Iodine is reduced to hydrogen iodide, which means it gains electrons and is the oxidizing agent. Therefore, the correct answer is "Iodine and hydrogen sulphide respectively".

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  • 24. 

    Pb + CuCl2 → PbCl2 + Cu The above reaction is an example of:

    • A.

      Combination

    • B.

      Double displacement

    • C.

      Decomposition

    • D.

      Displacement

    Correct Answer
    D. Displacement
    Explanation
    The given reaction involves the displacement of copper from copper chloride by lead. This is evident from the fact that lead (Pb) replaces copper (Cu) in the reaction, forming lead chloride (PbCl2) and leaving behind copper. Therefore, the correct answer is displacement.

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  • 25. 

    Most reactive metal is:

    • A.

      Mg

    • B.

      Na

    • C.

      K

    • D.

      Al

    Correct Answer
    C. K
    Explanation
    Potassium (K) is the most reactive metal among the options given. It belongs to Group 1 of the periodic table, also known as the alkali metals. These metals are highly reactive because they have only one electron in their outermost shell, which they readily lose to form a positive ion. Potassium reacts vigorously with water, releasing hydrogen gas and forming a strong alkaline solution. It also reacts with oxygen in the air, forming a white oxide layer. This reactivity is due to the low ionization energy and high electropositivity of potassium.

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  • 26. 

    What happens when a copper rod is dipped in an iron sulfate solution?

    • A.

      Copper displaces iron

    • B.

      Blue color of copper sulphate solution is obtained

    • C.

      No reaction takes place

    • D.

      Reaction is exothermic

    Correct Answer
    C. No reaction takes place
    Explanation
    When a copper rod is dipped in an iron sulfate solution, no reaction takes place. This is because copper is less reactive than iron, so it cannot displace iron from its compound. Additionally, there is no change in color observed in the solution, indicating that there is no chemical reaction occurring. Lastly, there is no mention of any heat being released, suggesting that the reaction is not exothermic. Therefore, the correct answer is that no reaction takes place.

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  • 27. 

    The equation Cu + xHNO3 -------> Cu(NO3)2 + yNO2 + 2H2O The values of x and y are

    • A.

      3 and 5

    • B.

      8 and 6

    • C.

      4 and 2

    • D.

      7 and 1

    Correct Answer
    C. 4 and 2
    Explanation
    In the given equation, Cu reacts with HNO3 to form Cu(NO3)2, NO2, and H2O. The balanced equation shows that for every 1 mole of Cu, 4 moles of HNO3 are required. This indicates that x (the coefficient of HNO3) must be 4. Additionally, the equation shows that for every 1 mole of Cu, 2 moles of NO2 are produced. Therefore, y (the coefficient of NO2) must be 2. Hence, the values of x and y are 4 and 2, respectively.

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  • 28. 

    A substance which oxidized itself and reduces other is known as

    • A.

      Oxidizing agent

    • B.

      Reducing agent

    • C.

      Both of these

    • D.

      None of these

    Correct Answer
    B. Reducing agent
    Explanation
    A reducing agent is a substance that undergoes oxidation by losing electrons, causing another substance to be reduced by gaining those electrons. In other words, it donates electrons to another substance, resulting in the reduction of that substance. This process is important in many chemical reactions, as it allows for the transfer of electrons and the conversion of one substance into another. Therefore, a substance that oxidizes itself and reduces others is known as a reducing agent.

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  • 29. 

    Which of the following does not corrode when exposed to the atmosphere?

    • A.

      Iron

    • B.

      Cupper

    • C.

      Gold

    • D.

      Silver

    Correct Answer
    C. Gold
    Explanation
    Gold does not corrode when exposed to the atmosphere because it is a highly unreactive metal. It is resistant to oxidation and does not easily react with oxygen or moisture in the air. This property makes gold highly valuable and desirable for use in jewelry and other applications where durability and resistance to corrosion are important.

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  • 30. 

    Take about 1.0g CaCO3 in a test tube. Heat it over a flame, when a colorless gas comes out. The reaction is called a

    • A.

      Decomposition reaction

    • B.

      Displacement reaction

    • C.

      Double decomposition reaction

    • D.

      Double displacement reaction

    Correct Answer
    A. Decomposition reaction
    Explanation
    When calcium carbonate (CaCO3) is heated, it decomposes into calcium oxide (CaO) and carbon dioxide (CO2) gas. The colorless gas that comes out during the heating process is the carbon dioxide gas. Therefore, the reaction described in the question is a decomposition reaction, where a compound breaks down into simpler substances.

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