Exothermic and Endothermic Reactions

Q.

The process that is not endothermic in nature is :

1. $\mathrm{H}\left(\mathrm{g}\right)+{\mathrm{e}}^{–}\to {\mathrm{H}}^{-}\left(\mathrm{g}\right)$

2. $\mathrm{Na}\left(\mathrm{g}\right)\to {\mathrm{Na}}^{-}\left(\mathrm{g}\right)\to {\mathrm{e}}^{–}$

3. $\mathrm{Ar}\left(\mathrm{g}\right)+{\mathrm{e}}^{–}\to {\mathrm{Ar}}^{-}\left(\mathrm{g}\right)$

4. ${\mathrm{O}}^{–}\left(\mathrm{g}\right)+{\mathrm{e}}^{–}\to {\mathrm{O}}^{2-}\left(\mathrm{g}\right)$

Q. Reactions in which energy is absorbed, usually in the form of heat are known as endothermic reactions.

1. True
2. False

Q.

How will you prepare slaked lime?