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JEE Main levelSingle correct optionDifficulty 2 of 3pb206

When excess aqueous $SnCl X_{2}$ is added gradually to aqueous $HgCl X_{2}$ , the observed change is

Aa white precipitate that turns grey/black
Ba black precipitate that turns white
Ca yellow precipitate that dissolves
Dno change

Answer: A

2 HgCl X_{2} + SnCl X_{2} Hg X_{2} Cl X_{2} ↓ (white) + SnCl X_{4}

. With excess

SnCl X_{2}

:

Hg X_{2} Cl X_{2} + SnCl X_{2} 2 Hg (grey / black) + SnCl X_{4}

.

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