Chapter 1 Chemical Equations And Reactions

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  • 1/10 Questions

    Electrolysis of water is decomposition reaction. the mole ratio of hydrogen and oxygen gases liberation during electrolysis of water is.

    • 1:1
    • 2:1
    • 4:1
    • 1:2
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About This Quiz

This quiz evaluates understanding of chemical reactions, focusing on topics like electrolysis, reaction types, and oxidation-reduction processes. It tests knowledge essential for mastering Chemistry, suitable for students preparing for competitive exams.

Chapter 1 Chemical Equations And Reactions - Quiz

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  • 2. 

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

    • X=fe , Y=fe2O3

    • X=Ag , Y= Ag2S

    • X=Cu , Y=CuO

    • X =Al , Y= Al2O3

    Correct Answer
    A. X=fe , Y=fe2O3
    Explanation
    When element X (fe) is exposed to moist air, it undergoes a chemical reaction and turns reddish brown. This indicates the formation of a new compound Y (fe2O3), which is iron(III) oxide. Iron(III) oxide is commonly known as rust and is formed when iron reacts with oxygen in the presence of moisture. Therefore, the correct answer is X=fe, Y=fe2O3.

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  • 3. 

    All the methods mentioned below can be used to prevent the food from getting rancid except: I. storing the food in the air tight containers. II. storing the food in refrigerator III. keeping the food in clean and covered containers. IV. always touching the food with clean hands.

    • (I) and (II)

    • (I) and (III)

    • (I),(III) and (IV)

    • (III) and (IV)

    Correct Answer
    A. (III) and (IV)
    Explanation
    Storing the food in air tight containers and storing the food in the refrigerator both help to prevent the food from getting rancid by limiting exposure to air and controlling the temperature. However, keeping the food in clean and covered containers and always touching the food with clean hands do not directly prevent the food from getting rancid. These practices are important for maintaining hygiene and preventing contamination, but they do not specifically address the issue of food rancidity.

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  • 4. 

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

    • 3 and 5

    • 8 and 6

    • 4 and 2

    • 7 and 1

    Correct Answer
    A. 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 means that x must be equal to 4. Additionally, the equation shows that for every 1 mole of Cu, 2 moles of NO2 are produced. This means that y must be equal to 2. Therefore, the values of x and y are 4 and 2, respectively.

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  • 5. 

    In a reaction between sulphuric acid and barium chloride solution the white precipitate are of:

    • Hydrochloric acid 

    • Barium sulphate 

    • Chlorine

    • Sulphur

    Correct Answer
    A. Barium sulphate 
    Explanation
    In a reaction between sulphuric acid and barium chloride solution, a white precipitate is formed. This white precipitate is known as barium sulphate.

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  • 6. 

    When copper powder is heated it gets coated with

    • Black copper oxide

    • Yellow copper oxide

    • Red copper oxide

    • None of the above

    Correct Answer
    A. Black copper oxide
    Explanation
    When copper powder is heated, it undergoes a chemical reaction with oxygen in the air, resulting in the formation of black copper oxide. This black coating is a result of the copper atoms combining with oxygen atoms to form copper oxide. This reaction is commonly known as oxidation and is responsible for the black color observed on the surface of the copper powder.

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  • 7. 

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

    • Carbon dioxide

    • Nitrogen

    • Oxygen

    • Neon 

    Correct Answer
    A. Nitrogen
    Explanation
    Nitrogen is used in the storage of fat and containing foods for a long time because it is an inert gas. It helps to create a controlled environment by displacing oxygen, which slows down the oxidation process and prevents the growth of bacteria and other microorganisms. This helps to extend the shelf life of the food and maintain its quality for a longer period of time.

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  • 8. 

    A substance which oxidized itself and reduced other is known as:

    • Oxidizing agent 

    • Reducing agent 

    • Both of these 

    • None of the above 

    Correct Answer
    A. Reducing agent 
    Explanation
    A reducing agent is a substance that donates electrons to another substance, causing it to be reduced. In this case, the substance oxidizes itself by losing electrons and at the same time reduces another substance by donating those electrons. Therefore, the correct answer is reducing agent.

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  • 9. 

    Black and white photography uses:

    • Decomposition of silver chloride

    • Decomposition of silver bromide

    • Both

    • None of the above

    Correct Answer
    A. Both
    Explanation
    Black and white photography uses both the decomposition of silver chloride and the decomposition of silver bromide. In traditional black and white film photography, silver halide crystals (such as silver chloride or silver bromide) are used to capture light and create an image. When exposed to light, these crystals undergo a chemical reaction called decomposition, which forms metallic silver particles. These silver particles are then developed and fixed onto the film, resulting in a black and white image. Therefore, both silver chloride and silver bromide are used in the process of black and white photography.

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  • 10. 

    Combination of phosphorus and oxygen is an example of________

    Correct Answer
    oxidation reaction
    Explanation
    A combination of phosphorus and oxygen is an example of an oxidation reaction because oxidation involves the loss of electrons or an increase in the oxidation state of an element. In this case, phosphorus is being oxidized as it gains oxygen atoms and increases its oxidation state.

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  • Feb 23, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • May 12, 2020
    Quiz Created by
    Anmol Chandelia
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