Question

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

Answer 1

B. 2Na (s) + CI2 (g) → 2NaCI (s)

Step-by-step explanation:

Just took the test and got it right!

Answer 2

Answer : The correct example of a decomposition reaction is, (A)

`CaCO_3(s)\rightarrow CaO(s)+CO_2(g)`

Explanation :

Decomposition reaction : It is defined as the reaction in which the the larger molecule decomposes to give two or more smaller molecules.

(A) The given balanced chemical reaction is,

`CaCO_3(s)\rightarrow CaO(s)+CO_2(g)`

This reaction is a decomposition reaction in which the the larger molecule calcium carbonate decomposes to give two or more smaller molecules as calcium oxide and carbon dioxide.

(B) The given balanced chemical reaction is,

`2Na(s)+Cl_2(g)\rightarrow 2NaCl(s)`

This reaction is a synthesis reaction where multiple substances or reactants combine to form a single product.

(C) The given balanced chemical reaction is,

`Cu(s)+2AgNO_3(aq)\rightarrow Cu(NO_3)_2(aq)+2Ag(s)`

This reaction is a synthesis reaction in which the more reactive element replace the less reactive element.

(D) The given balanced chemical reaction is,

`Zn(s)+2HCl(aq)\rightarrow ZnCl_2(aq)+H_2(g)`

This reaction is a synthesis reaction in which the more reactive element replace the less reactive element.

Hence, the correct example of a decomposition reaction is, (A)

`CaCO_3(s)\rightarrow CaO(s)+CO_2(g)`