Name :

(a) a nitrate of metal which on heating does not give nitrogen dioxide.

(b) a nitrate which on heating leaves no residue behind.

(c) a metal nitrate which on heating is changed into metal oxide.

(d) a metal nitrate which on heating is changed into metal.

(e) a solution which absorbs nitric oxide.

(f) the oxide of nitrogen which turns brown on exposure to air. How is it prepared ?

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Solution

(a) Sodium nitrate
$2 N a N O_{3} h e a t - - \to 2 N a N O_{2} + O_{2}$

(b) A nitrate which on heating leaves no residue behind- Ammonium nitrate.

(c) A metal nitrate which on heating is changed into metal oxide- Calcium nitrate

(d) A metal nitrate which on heating is changed into metal- Silver nitrate

(e) A solution which absorbs nitric oxide- Freshly prepared ferrous sulphate

(f) The oxide of nitrogen which turns brown on exposure to air. - NO combines with Oxygen when exposed to air to give $N O_{2}$ which is brown in colour.

$4 N H_{3} (g) + 5 O_{2} (g) ⟶ 4 N O (g) + 6 H_{2} O (l)$

$2 N O + O_{2} ⟶ 2 N O_{2}$

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