Magnesium is burnt in air to form A nd B . When B is hydrolysed , C and D are formed . D is the reactant in the manufacture of nitric acid by Ostwald's process . What is C ?

Options

A. `NH_(3)`
B. `Mg(H)_(2)`
C. `MgO`
D. `NO`

Answer

B

Explanation

When magnesium is burnt in air, it forms two products (A and B) . The compound .A. is magnesium oxide and compound .B. is traces of magnesium nitride (formed as a result of reaction between magnesium and molecular nitrogen) . Now , on hydrolysis of magnesium nitride (B), it forms ammonia and magnesium hydroxide.
since, .D. is the reactant in the manufacture of nitric acid by Ostwald.s process . Thus , compoud .D. is `NH_(3)` and compound .C. is Mg `(OH)_(2)` . The respective reactions for the following information are as follows :
`2Mg (s) O_(2) (g) overset(Delta)tounderset(.A.)(2MgO(s)) ` (Magnesium oxide)
`3 Mg (s) +N_(2)(g) to underset(.B.) (Mg_(3)N_(2)(s))` (magnesium nitride)
`Mg_(3) N_(2) (s) +6H_(2) O(l)to underset(C)(2Mg (OH)_(2)(s))+ 2 NH_(3)(g)` (magnesium hydroxide)