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Nitrates

Aorange Cg+r...

Question

A(orange) $Δ - \to C (g) + r e s i d u e (c) (g r e e n) + H_{2} O$
$↓ N a O H$
D(g) $H C l - - \to$ white fumes
B(g) $A l - \to Δ (E) H_{2} O - - \to g a s (B)$
Residue (C) $c o n c . H C l - ---- \to (F) N a O h, H_{2} O_{2} - ------ \to Δ G$ (yellow)

$C H_{3} C O O H - -------- \to (C H_{3} C O O)_{2} P b$ H (yellow

If true enter 1, else enter 0.

Compounda (A) to (H) are identified as (A) $({N H}_{4})_{2} {C r}_{2} O_{7}$ , (B) $N_{2}$ , (C) ${C r}_{2} O_{3}$ , (D) ${N H}_{3}$ , (E) $A I N$ , (F) ${C r C l}_{3}$ , (G) ${N a}_{2} {C r O}_{4}$ and (H) ${P b C r O}_{4}$

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Solution

When ammonium dichromate is heated, it gives nitrogen gas, green residue of chromium trioxide and water.
$({N H}_{4})_{2} {C r}_{2} O_{7} h e a t - - \to N_{2} + C r_{2} O_{3} + 4 H_{2} O$
When ammonium dichromate is heated with NaOH, ammonia gas is obtained which reacts with HCL to form white fumes of ammonium chloride.
$({N H}_{4})_{2} {C r}_{2} O_{7} + 2 N a O H \to 2 N H_{3} + N a_{2} C r_{2} O_{7} + 2 H_{2} O$
$N H_{3} + H C l \to N H_{4} C l$
When nitrogen is heated with aluminum, aluminum nitride is obtaned.
$N_{2} + 2 A l h e a t - - \to 2 A l N$
AlN on hydrolysis forms aluminum hydroxide and releases ammonia gas.
$A l N + 3 H_{2} O \to A l (O H)_{3} + N H_{3}$
Chromium oxide on acidification with conc. HCl forms Chromium(III) chloride.
$C r_{2} O_{3} + 6 H C l \to 2 C r C l_{3} + 3 H_{2} O$
Chromium(III) chloride on oxidation with alkaline hydrogen peroxide forms yellow sodium chromate.
$C r C l_{3} + 2 N a O H + H_{2} O_{2} \to N a_{2} C r O_{4} + 3 H C l$
Sodium chromate reacts with lead acetate in presence of acetic acid to form lead chromat which is also yellow in colour.
${N a}_{2} {C r O}_{4} + P b (C H_{3} C O O)_{2} C H_{3} C O O H - ------ \to P b {C r O}_{4}$

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(N H_{4})_{2} C r_{2} O_{7}

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