Question

6. Write one of the reaction for each of the following characteristics :

(c) Evolution of gas

Answer 1

• A chemical reaction may take place when two or more reactants come in contact with one another resulting in the formation of new substances called products accompanied by the transfer of energy among them.
• Certain chemical reactions are characterized by the evolution of a gas.

Example:

• When Zinc metal is treated with dilute sulfuric acid, hydrogen gas is evolved. The hydrogen gas burns with a pop sound.
• $\underset{\mathrm{Zinc}\mathrm{Sulfuric}\mathrm{acid}\mathrm{Zinc}\mathrm{sulfate}\mathrm{Hydrogen}}{\mathrm{Zn}+{\mathrm{H}}_2{\mathrm{SO}}_4\left(\mathrm{dil}\right)\to {\mathrm{ZnSO}}_4+{\mathrm{H}}_2}$