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

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Q: 41 (NDA-I/2022)

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

question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,19,16,9,19,5,2

keywords: 

{'decomposition reaction': [0, 0, 0, 1], 'reactions': [1, 0, 0, 4], 'c12': [0, 0, 0, 1], 'cus04': [0, 0, 0, 1], 'sunlight': [0, 0, 1, 0], 'fes04': [0, 0, 0, 1]}

Option 1: CH4(g) + 202(g)—>C02(g) + 2H20(g)

This is not a decomposition reaction. It is a combination reaction where methane (CH4) and oxygen (O2) combine to form carbon dioxide (CO2) and water (H2O).

Option 2: 2AgCl(s) + Sunlight [REPLACEMENT] 2Ag(s) + C12(g)

This is indeed an example of a decomposition reaction. When silver chloride (AgCl) is exposed to sunlight, it decomposes into silver (Ag) and chlorine (Cl2) gas.

Option 3: CuO + H2—Heat[REPLACEMENT]Cu + H20

This is a redox reaction, not a decomposition reaction. Copper oxide (CuO) reacts with hydrogen gas (H2) under heat to form copper (Cu) and water (H2O).

Option 4: Fe(s) + CuS04(aq) —» FeS04(aq) + Cu(s)

This is a single displacement reaction, not a decomposition reaction. Iron (Fe) reacts with copper sulfate (CuSO4) to form iron sulfate (FeSO4) and copper (Cu).

Therefore, the correct answer is

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