When a white crystalline compound X is heated with K2Cr2O7 and concentrated H2SO4 a reddish brown gas A is evolved. On passing A into caustic soda solution, a yellow coloured solution of B is obtained.
Neutralizing the solution B with acetic acid and on subsequent addition of lead acetate, a yellow precipitate C is obtained. When X is heated with NaOH solution, a colourless gas is evolved and on passibn this gas into K2HgI4 solution, a reddish brown precipitate D is formed.
Identify A<B<C< D< X
give the equations involved.
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3 Answers
21A = chromyl chloride = CrO2Cl2
B = Na2CrO4
C = PbCrO4
X = NH4Cl
D = Millon's base of Iodide = HgO·Hg(NH2)I
11Equations:-
4NH4Cl + K2Cr2O7 + 3H2SO4 → 2(NH4)2SO4 + K2SO4 + 2CrO2Cl2
X A
CrO2Cl2 +NaOH → Na2CrO4 + 2H2O +2NaCl
A B
Na2CrO4 + (CH3COO)2Pb →PbCrO4 + 2CH3COONa
B C
3NaOH + NH4Cl + 2K2HgI4 → HgO.Hg(NH2)I + 4KI + 3NaI + HCl
X D