Chemical Reactions And Equations

Approved & Edited by ProProfs Editorial Team
The editorial team at ProProfs Quizzes consists of a select group of subject experts, trivia writers, and quiz masters who have authored over 10,000 quizzes taken by more than 100 million users. This team includes our in-house seasoned quiz moderators and subject matter experts. Our editorial experts, spread across the world, are rigorously trained using our comprehensive guidelines to ensure that you receive the highest quality quizzes.
Learn about Our Editorial Process
| By Neeraj Punia
N
Neeraj Punia
Community Contributor
Quizzes Created: 1 | Total Attempts: 50
Questions: 10 | Attempts: 50

SettingsSettingsSettings
Chemical Reactions And Equations - Quiz


Questions and Answers
  • 1. 

    The electrolytic decomposition of water gives H2 and O2 in the ratio of

    • A.

      1:2 by volume

    • B.

      2:1 by volume

    • C.

      8:1 by mass

    • D.

      1:2 by mass

    Correct Answer
    B. 2:1 by volume
    Explanation
    The electrolytic decomposition of water produces hydrogen gas and oxygen gas in a 2:1 ratio by volume. This means that for every 2 volumes of hydrogen gas produced, 1 volume of oxygen gas is produced. This ratio is a result of the balanced chemical equation for the electrolysis of water, which shows that 2 moles of water molecules break down to form 2 moles of hydrogen gas and 1 mole of oxygen gas. Since gases occupy the same volume under the same conditions of temperature and pressure, the volume ratio of the two gases is 2:1.

    Rate this question:

  • 2. 

     The chemical formula of lead sulphate is Pb(SO4)2

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    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:

  • 3. 

    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 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:

  • 4. 

    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.

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

    • D.

      Rearrangement of the atoms of reactants to form new products

    Correct Answer
    C. Changing of the atoms of on element into those of another element to form new  products
    Explanation
    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:

  • 5. 

      On decomposition of lead nitrate  ________ gas (write name) is evolved which is ________ in colour.

    Correct Answer
    NItrogen Dioxide
    Brown
    Explanation
    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?

    • A.

      Slaked lime

    • B.

      Carbon dioxide

    • C.

      Calcium oxide

    • D.

      Oxygen gas

    Correct Answer
    A. Slaked lime
    Explanation
    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:

  • 7. 

    What happens when carbon dioxide is passed in lime water?

    • A.

      Lime water turns milky because of formation of water

    • B.

      Lime water turns milky because of formation of calcium carbonate

    • C.

      Lime water turns red because of formation permanganate

    • D.

      Lime water turns red because of formation of copper sulphate

    Correct Answer
    B. Lime water turns milky because of formation of calcium carbonate
    Explanation
    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:

  • 8. 

    What happens when Copper metal is dipped in the solution of zinc sulphate?

    • A.

      Copper sulphate is formed

    • B.

      Zinc metal is separated

    • C.

      Oxygen gas is formed

    • D.

      No reaction takes place

    Correct Answer
    D. No reaction takes place
    Explanation
    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:

  • 9. 

    Which of the following is termed as rancidity?

    • A.

      Reduction of oxygen present in food

    • B.

      Oxidation of sugar present in food

    • C.

      Oxidation of oil present in food

    • D.

      All of the above

    Correct Answer
    C. Oxidation of oil present in food
    Explanation
    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:

  • 10. 

    The following reactions is an example of

    • A.

      Redox reaction

    • B.

      Electrolytic decomposition

    • C.

      Thermal decomposition

    • D.

      Photolytic decomposition

    Correct Answer
    C. Thermal decomposition
    Explanation
    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:

Back to Top Back to top
Advertisement
×

Wait!
Here's an interesting quiz for you.

We have other quizzes matching your interest.