Which one of the following reactions is an example of decomposition reaction?
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NDA 01/2022: General Ability Test Previous Year Paper (Held On 10 April 2022)
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- CH4 (g) + 2O2 (g) → CO2(g) + 2H2O(g)
- 2AgCI(s) \(\rm \xrightarrow{Sunlight} \) 2Ag(s) + CI2(g)
- CuO + H2 \(\rm \xrightarrow{Heat} \) Cu + H2O
- Fe(s) + CuSO4 (aq) → FeSO4 (aq) + Cu(s)
Answer (Detailed Solution Below)
Option 2 : 2AgCI(s) \(\rm \xrightarrow{Sunlight} \) 2Ag(s) + CI2(g)
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Electric charges and coulomb's law (Basic)
10 Questions 10 Marks 10 Mins
Explanation:
Decomposition Reaction:
The reaction in which one reactant decomposes or breaks into two or more products is called a Decomposition reaction.
A → B + C
2AgCI(s) \(\rm \xrightarrow{Sunlight} \) 2Ag(s) + CI2(g)
Combination Reaction:
- The reaction in which two or more substances combine to form one product is called a Combination reaction.
- Example - CH4 (g) + 2O2 (g) → CO2(g) + 2H2O(g)
Displacement reaction:
- The reaction in which cation or anion from the reactant side is displaced to the products is called displacement reaction.
- A displacement reaction is also known as a metal displacement reaction.
- Example - CuO + H2 \(\rm \xrightarrow{Heat} \) Cu + H2O
- Metals of high reactivity displace the metals of low reactivity from their anions.
Double displacement reaction:
- The reaction in which both cation and anion are displaced to the products is called a double displacement reaction.
- Example - Fe(s) + CuSO4 (aq) → FeSO4 (aq) + Cu(s)
Exothermic Reaction:
- The reaction in which heat is evolved is called an exothermic reaction.
- Cao + H2O → Ca(OH) + Heat .
Endothermic Reaction:
- The reaction which takes place by absorbing heat energy is called an endothermic reaction.
- A + B + Heat → C + D
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Solution
The correct option is A
In decomposition reactions, a single reactant decomposes to form two or more products.