`MgN_(2)` when reacted with water gives `NH_(3)` and HCl. However, `MgCl_(2)` does not give HCl when treated with water at room temperature. Assigne reason.

Explanation

`Mg_(2)N_(2)` is a salt of strong base `Mg(OH)_(2)` and weak acid `NH_(3)`. It undergoes hydrolysis to evolve ammonia as follows:
`Mg_(3)N_(2) + 3H_(2)O to 3Mg(OH)_(2) + 2NH_(3)`
But `MgCI_(2)` is a salt of strong base and strong acid and does not undergoes hydrolysis with water. Therefore, HCI is not formed.