Question

The Law of conservation of mass is always violated in a chemical reaction in which gas is evolved

• A. True
• B. False

Answer 1

The correct option is B False

Understanding the concept:

In a chemical reaction, the reactants are written on the left side while the products are written on the right side.

Explanation of conservation of mass in a chemical reaction:

According to the law of conservation of mass," in a chemical reaction mass can neither be created nor destroyed".

As a result, the total mass of the reactants and products is equal.

For example decomposition of calcium carbonate(${\mathrm{CaCO}}_3$) results in the formation of calcium oxide(CaO) and evolution of carbondioxide(${\mathrm{CO}}_2$) gas.

$$\begin{gathered} {\mathrm{CaCO}}_3\to \mathrm{CaO}+{\mathrm{CO}}_2\uparrow \\ 1\mathrm{OO}\mathrm{g}56\mathrm{g}46\mathrm{g} \end{gathered}$$

Sum of mass of reactants (100 g) = Sum of masses of products [(56 + 44) g

Hence the Law of conservation of mass is always violated in a chemical reaction in which gas is evolved is a false statement.