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JEE Main levelSingle correct optionDifficulty 2 of 3pb099

When $HgCl X_{2}$ solution is added slowly to excess $SnCl X_{2}$ solution, the observation is

Aa yellow precipitate throughout
Ba white precipitate that turns grey
Ca black precipitate that dissolves in excess
Dno change at all

Answer: B

2 HgCl X_{2} + SnCl X_{2} Hg X_{2} Cl X_{2} + SnCl X_{4}

gives white

Hg X_{2} Cl X_{2}

. With excess

SnCl X_{2}

it is further reduced to grey metallic mercury:

Hg X_{2} Cl X_{2} + SnCl X_{2} 2 Hg + SnCl X_{4}

.

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