Question

Identify and correct the mistakes in the following sentences: While balancing a chemical equation,
a) change the formulae wherever necessary.
b) use the upward arrow mark $(\uparrow )$ if the product formed is a precipitate.

Answer 1

While writing a balanced chemical equation:-

(i) Never change the formula of the compound. You can add coefficient before any formula to balance the chemical equation.

(ii) Use the downward arrow $(\downarrow )$ if the product formed is a precipitate. The upward arrow $(\uparrow )$ is used when the product formed is a gas.