. The complete balanced equation is

CuO + NH3 → Cu + N2 + H2O

A: 3CuO + 2NH3 →3 Cu + N2 + 3H2O

B: CuO + 2NH3 →3 Cu + 2N2 + 3H2O

C: 3CuO + NH3→3 Cu + N2 + 3H2O

D: None of these


Best Answer


The correct answer is option A. 

This can be elaborated as follows:

In order to balance a chemical equation,it needs to ensure that there are an equal number of atoms of all elements on either side of the arrow i.e.same in reactant and product side. 

This can be primarily done by hit and trial method ,though redox method can also be applied and is more preferred esp,in case of complicated/ionic reactions.

Post balancing ,the equation looks like this:

3CuO(s) + 2NH3(g) → 3Cu(s) + N2(g) + 3H2O(l).

No.of atoms of all elements is same on either side of the arrow i.e 3 Cu on each side

3 O on each side,

2 N on each side, and

6 H in either sides. 

Final Answer: 

Hence, the reaction has been balanced and is presented below:

3CuO(s) + 2NH3(g) → 3Cu(s) + N2(g) + 3H2O(l), 

So, the correct answer is determined to be option A. 


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