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JEE Main levelSingle correct optionDifficulty 2 of 3sb178

Assuming that ammonia and carbon dioxide are fully recycled, the only waste by-product of the Solvay process is

A $NaOH$
B $CaCl X_{2}$
C $Ca (OH) X_{2}$
D $NH X_{4} Cl$

Answer: B

The net change is

2 NaCl + CaCO X_{3} Na X_{2} CO X_{3} + CaCl X_{2}

.

NH X_{4} Cl

is converted back to

NH X_{3}

with

Ca (OH) X_{2}

, and the calcium ends up as

CaCl X_{2}

solution.

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