Name: [5 MARKS]
(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.

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Solution

Each Part: 1 Mark

a) Sodium nitrate, $N a N O_{3}$ . It does not give $N O_{2}$ on heating.
$2 N a N O_{3} Δ \to 2 N a N O_{2} + O_{2} ↑$

(b) Ammonium nitrate, $N H_{4} N O_{3}$ on heating does not give any residue.
$N H_{4} N O_{3} Δ \to 2 H_{2} O ↑ + N_{2} O ↑$

(c) Copper nitrate, $C u (N O_{3})_{2}$ on heating gives CuO and $N O_{2}$ .
$2 (C u N O_{3})_{2} Δ \to 2 C u O + 4 N O_{2} + O_{2}$

(d) Silver nitrate, $A g N O_{3}$ on heating gives Ag, $N O_{2}$ and $O_{2}$ .
$2 A g N O_{3} Δ \to 2 A g + 2 N O_{2} + O_{2} ↑$

(e) Iron(III) sulphate $(F e S O_{4})$ absorbs NO.
$F e S O_{4} + N O \to F e S O_{4} . N O$

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