When an aqueous solution of gas (X) is added to FeCl3 solution, a brown precipitate is obtained which is soluble in dil. HNO3, gas (X) will give white fumes with HCl, then gas (X) is :
A
SO2
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B
Cl2
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C
CO2
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D
NH3
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Solution
The correct option is BNH3 Gas X is NH3 When an aqueous solution of NH3 gas is added to FeCl3 solution, a brown precipitate of Fe(OH)3 is obtained which is soluble in dil.HNO3. FeCl3 +NH3 +H2O +NH4Cl⟶Fe(OH)3↓ +NH4Cl NH3 gives white fumes with HCl NH3+HCl⟶NH4Cl(whitefumes)