Combination and Decomposition ReactionsPractice Questions & MCQs
Practice Combination and Decomposition Reactions questions from Chemical Reactions and Equations (Class 10 Science) - important MCQs with answers and step-by-step solutions. Solve the sample questions below, then practice the full set free on the RankByte app.
Combination and Decomposition ReactionsQuiz - Solve & Score
Q1. What is the name of the reaction in which a single reactant breaks down to give simpler products?
- A.Combination reaction
- B.Exothermic reaction
- C.Decomposition reaction
- D.Endothermic reaction
Answer: C. Decomposition reaction
Eliminate first - option A) 'Combination reaction' is incorrect: Combination reaction involves two or more substances combining to form a single product; option B) 'Exothermic reaction' doesn't hold - Exothermic reaction involves heat being released along with the formation of products; option D) 'Endothermic reaction' is incorrect: Endothermic reaction involves heat being absorbed during the reaction. That leaves only option C). Confirm with the chapter rule: Decomposition reaction involves a single reactant breaking down to give simpler products (chemistry, chapter 'Chemical Reactions and Equations'). Answer: C) Decomposition reaction.
Q2. The decomposition reaction of silver chloride is caused by which form of energy?
- A.Heat
- B.Light
- C.Electricity
- D.Mechanical energy
Answer: B. Light
Concept involved: The reaction is caused by sunlight. Translating to the choices: The reaction is caused by sunlight, which provides the energy needed for decomposition. Ruling out the other options: option A) 'Heat' is wrong because The reaction is caused by sunlight, not heat; option C) 'Electricity' doesn't hold - The reaction is caused by sunlight, not electricity; option D) 'Mechanical energy' doesn't hold - The reaction is caused by sunlight, not mechanical energy. Putting it together the correct option is B) Light.
Q3. Which of the following is a decomposition reaction (NCERT)?
- A.2FeSO4 --heat--> Fe2O3 + SO2 + SO3
- B.Zn + CuSO4 -> ZnSO4 + Cu
- C.NaOH + HCl -> NaCl + H2O
- D.CaO + H2O -> Ca(OH)2
Answer: A. 2FeSO4 --heat--> Fe2O3 + SO2 + SO3
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