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Question

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-colored solution B is obtained. Neutralizing the solution of 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 colorless gas is evolved and on passing this gas into K2HgI4 solution, a reddish-brown precipitate D is formed.

Identify D.

A
Hg2I2
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B
H2NHgOHgI
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C
HgI2
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D
Hg(NH2)2
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Solution

The correct option is B H2NHgOHgI
When a white crystalline compound X is heated with K2Cr2O7 and concentrated H2SO4, a reddish-brown gas A is evolved. This must be chromyl chloride coming from a chloride salt. On passing A into caustic soda solution, a yellow-colored solution B is obtained. This is sodium chromate. Neutralizing the solution of B with acetic acid and on subsequent addition of lead acetate, a yellow precipitate C is obtained. This is lead chromate. When X is heated with NaOH solution, a colorless gas is evolved and on passing this gas into K2HgI4 solution, a reddish-brown precipitate D is formed. The gas is ammonia, so A is ammonium chioride. D is iodide of Millon's base.
K2Cr2O7+2H2SO42KHSO4+2CrO3+H2O
NH4Cl+H2SO4NH4HSO4+HCl
CrO3+2HClCrO2Cl2+H2OOrangeredvapors
NaOH+CrO2Cl2Na2CrO4+NaCl+H2OYellowsolution
Pb(CH3COO)2+Na2CrO4PbCrO4+CH3COONaYellowppt.
NH4Cl+NaOHNaCl+H2O+NH3
2K2HgI4+NH3+3KOHNH2HgOHgI+7KI+2H2O
H2NHgOHgI is brown colored iodide of Millon's base

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