Chemical Reactions Quiz - CBSE Class 10 Science

Free practice quiz: Chemical Reactions (CBSE Class 10 Science). 19 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 10 Science practice quiz has 19 multiple-choice questions on Chemical Reactions, and 19 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. What is a chemical reaction?

   1. A process where substances interact to form new substances
   2. A phenomenon where light is emitted
   3. A situation where heat is absorbed
   4. A condition where substances split into atoms
   Show answer

   Answer: A. A process where substances interact to form new substances

   A chemical reaction involves the transformation of one or more substances into different substances. This transformation involves bond breaking and forming, leading to new substances.

2. Which is an example of an exothermic reaction?

   1. Melting of ice
   2. Rusting of iron
   3. Combustion of wood
   4. Dissolution of ammonium nitrate in water
   Show answer

   Answer: C. Combustion of wood

   Exothermic reactions release energy in the form of heat or light. Combustion of wood is an exothermic process as it releases heat and light.

3. In which type of reaction do two or more reactants combine to form a single product?

   1. Decomposition reaction
   2. Combination reaction
   3. Displacement reaction
   4. Redox reaction
   Show answer

   Answer: B. Combination reaction

   A combination reaction is characterized by two or more reactants combining to form a single product, also known as a synthesis reaction.

4. What occurs in a double displacement reaction?

   1. Two elements exchange places
   2. One element replaces another in a compound
   3. Products form reactants
   4. Reactants combine to form a complex compound
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   Answer: A. Two elements exchange places

   In a double displacement reaction, the ions of two compounds exchange places in an aqueous solution to form two new compounds.

5. How does temperature affect the rate of a chemical reaction?

   1. Higher temperature always slows the reaction
   2. Higher temperature lowers activation energy
   3. Higher temperature increases molecular collisions
   4. Higher temperature makes reactants vibrate
   Show answer

   Answer: C. Higher temperature increases molecular collisions

   An increase in temperature generally increases reaction rates because the number of molecular collisions with sufficient energy, or activation energy, increases.

More questions in this quiz

Answers and explanations are in the full quiz.

1. Which of the following signs indicates a chemical change?
2. What gas is commonly produced during the reaction between an acid and a metal?
3. What happens to the atoms during a chemical reaction?
4. Which of the following is the law of conservation of mass?
5. Which type of reaction is photosynthesis?
6. What type of reaction is occurring when energy is being released in the form of heat?
7. Which statement accurately describes a catalyst?
8. What does redox refer to in chemical reactions?
9. How does a balanced chemical equation follow the law of conservation of mass?
10. What is the role of a solvent in a reaction?
11. What distinguishes a spontaneous reaction from a non-spontaneous one?
12. What occurs in a reaction mechanism?
13. What is the role of an enzyme in a biochemical reaction?
14. What characterizes a reaction at equilibrium?

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