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Grade: 12
        When a white crystalline compound X is heated with K2cr2o7 and conc h2so4, a reddish brown gas A is evolved.On passing A into Naoh sol yellow coloured sol of B is obtained.neutralising the sol B with acetic acid on subsequent addition of lead acetates, a yellow ppt C is obtained.when X is heated with naoh sol, a colourless gas evolved and on passing this gas into k2hgI4 sol, a reddish brown ppt is formed D.identify A B C D and X
3 years ago

Answers : (1)

Vikas TU
10600 Points

A = CrO2Cl2
B = Na2CrO4
C = PbCrO4
X = NH4Cl
D = Millon's base of Iodide = HgO·Hg(NH2)I

The Reactions would be:
For chromyl chloride,
4NH4Cl + K2Cr2O7 + 3H2SO4 → 2(NH4)2SO4 + K2SO4 + 2CrO2Cl2
For Sodium Chromate
CrO2Cl2 +NaOH → Na2CrO4 + 2H2O +2NaCl

For lead Chromate
Na2CrO4 + (CH3COO)2Pb →PbCrO4 + 2CH3COONa
For Millions base of Iodide
3NaOH + NH4Cl + 2K2HgI4 → HgO.Hg(NH2)I + 4KI + 3NaI + HCl


3 years ago
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