Question

A metal $X$ produces an oxide and nitride on burning in air, but does not liberate hydrogen with alkali. Another metal $Y$ produces an oxide and nitride on burning in air and also liberates hydrogen with alkalies. The metals $X$ and $Y$ respectively are:

• A. Na, Mg
• B. Mg, Al
• C. Na, Al
• D. Al, Mg

Answer 1

The correct option is B Mg, Al

When magnesium is burnt in air, it forms magnesium oxide and magnesium nitride.

$2Mg+O_2\to 2MgO$

$3Mg+N_2\to M{g}_3{N}_2$

Magnesium does not liberate hydrogen with alkali.

When aluminium is burnt in air, it forms aluminium oxide and aluminium nitride.

$4Al+3O_2\to 2A{l}_2{O}_3$

$2Al+N_2\to 2AlN$

Aluminum also reacts with alkali to liberate hydrogen.

$2Al+2NaOH+2H_{2}O\to 2NaAl{O}_2+3H_2$