Which one of the following is the example of decomposition reaction?

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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1. CH4 (g) + 2O2 (g) → CO2(g) + 2H2O(g)
2. 2AgCI(s) \(\rm \xrightarrow{Sunlight} \) 2Ag(s) + CI2(g)
3. CuO + H2 \(\rm \xrightarrow{Heat} \) Cu + H2O
4. 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 AIn decomposition reactions, a single reactant decomposes to form two or more products.

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Which one of the following is an example of decomposition?

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Which one of the following is not an example of decomposition reaction?