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Question


A(orange)ΔC(g)+residue(c)(green)+H2O
NaOH
D(g) HCl white fumes
B(g)AlΔ(E)H2Ogas(B)
Residue (C) conc.HCl−−−−(F)NaOh,H2O2−−−−−−ΔG(yellow)

CH3COOH−−−−−−−−(CH3COO)2Pb H (yellow

If true enter 1, else enter 0.

Compounda (A) to (H) are identified as (A) (NH4)2Cr2O7, (B) N2, (C) Cr2O3, (D) NH3, (E) AIN, (F) CrCl3, (G) Na2CrO4 and (H) PbCrO4

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Solution

When ammonium dichromate is heated, it gives nitrogen gas, green residue of chromium trioxide and water.
(NH4)2Cr2O7heatN2+Cr2O3+4H2O
When ammonium dichromate is heated with NaOH, ammonia gas is obtained which reacts with HCL to form white fumes of ammonium chloride.
(NH4)2Cr2O7+2NaOH2NH3+Na2Cr2O7+2H2O
NH3+HClNH4Cl
When nitrogen is heated with aluminum, aluminum nitride is obtaned.
N2+2Alheat2AlN
AlN on hydrolysis forms aluminum hydroxide and releases ammonia gas.
AlN+3H2OAl(OH)3+NH3
Chromium oxide on acidification with conc. HCl forms Chromium(III) chloride.
Cr2O3+6HCl2CrCl3+3H2O
Chromium(III) chloride on oxidation with alkaline hydrogen peroxide forms yellow sodium chromate.
CrCl3+2NaOH+H2O2Na2CrO4+3HCl
Sodium chromate reacts with lead acetate in presence of acetic acid to form lead chromat which is also yellow in colour.
Na2CrO4+Pb(CH3COO)2CH3COOH−−−−−−PbCrO4

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