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Q.

A white crystalline solid (A) on boiling with caustic soda solution gave a gas (B), which when passed through an alkaline solution of potassium mercuric iodide gave brown precipitate. The substance (A) on heating gave a gas (X), which rekindled a glowing splinter but did not give brown fumes With nitric oxide. The gas (B) is :

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a

$HCl$

b

$H_{2} S$

c

${CO}_{2}$

d

${NH}_{3}$

answer is B.

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Detailed Solution

${NH}_{4}^{+} \overset{NaOH}{⟶} {NH}_{3} \to_{{OH}^{-}}^{K_{2} {HgI}_{4}} HgO \cdot Hg ({NH}_{2}) I ↓ (A) (B) (Brown ppt .)$

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