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NEET levelSingle correct optionDifficulty 1 of 3qa093

Which gas, evolved on treating a salt with dilute acid, turns filter paper moistened with lead acetate black?

A $CO X_{2}$
B $H X_{2} S$
C $SO X_{2}$
D $NO X_{2}$

Answer: B

H X_{2} S

reacts with lead acetate to give black

PbS

,

Pb X^{2 +} + H X_{2} S PbS + 2 H X^{+}

. The other gases do not form a black lead compound.

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