Question

Which of the following is a Decomposition Reaction?
A) 2HgO ----> 2Hg + O2
B) 6NaNO3 ----> 6NaNO2 + 3O2
C) ZnCO3 ----> ZnO + CO2
D) All the above

Answer 1

Hey Friend,

Let's look into what a decomposition reaction is : A reaction in which the reactant is broken down into 2 or more different products.

Let's see the options

A) 1 reactant into 2 products. Hence it is a decomposition reaction.

B) 1 reactant into 2 products. Hence it is a decomposition reaction.

C) 1 reactant into 2 products. Hence it is a decomposition reaction.

Hence, the answer is all of the above.

hope it helps.

Answer 2

Hlo mate !!

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Firstly , What is a Decomposition reaction ?

Ans :-
A reaction in which a chemical compound breaks down (decomposes) and the products are :-

√ Two or more elements ,
√ Element and a compound ,
√ Two or more compound .

So , the answer for the above question is -

$<b><i>All of the above ..</b></i>$

Reason :-

In reaction A) 2HgO --» 2Hg + O2 , here , on decomposition , the products are two elements - Mercury and Oxygen .

In reaction B) 6NaNO3 --» 6NaNO2 + 3O2 , here , on decomposition , the products are one compound 'Sodium Nitrite' and an element 'Oxygen' .

In reaction C) ZnCO3 --» ZnO + CO2 , here , on decomposition , the products are two compounds - 'Zinc Oxide' and 'Carbon Dioxide' .

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Hope helps !!