What is the final chemical equation from the following intermediate chemical equations?

the answer to that question is a

Answer : The correct option is, (1)

Explanation :

The two intermediate chemical equations are :

    ..............(1)

   .............(2)

Now adding equation (1) and equation (2), we get

Now we will cancel the from both the sides of the equation, we get

Now we will subtracting from the , we get

This is the final chemical equation.