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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3sb217

Which of the following conversions can be achieved in a single step?

A $Na X_{2} CO X_{3}$ to $NaOH$ by treatment with aqueous $Ca (OH) X_{2}$
B $NaCl$ to $NaHCO X_{3}$ by passing $CO X_{2}$ into aqueous $NaCl$ alone
C $NaHCO X_{3}$ to $Na X_{2} CO X_{3}$ by heating the solid
D $Na X_{2} CO X_{3}$ to $NaHCO X_{3}$ by passing $CO X_{2}$ into its aqueous solution

Answer: A, C, D

Calcination:

2 NaHCO X_{3} Na X_{2} CO X_{3} + CO X_{2} + H X_{2} O

. Causticisation:

Na X_{2} CO X_{3} + Ca (OH) X_{2} 2 NaOH + CaCO X_{3}

. Carbonation:

Na X_{2} CO X_{3} + CO X_{2} + H X_{2} O 2 NaHCO X_{3}

.

CO X_{2}

alone cannot convert

NaCl

since the solution is not basic enough to take up

CO X_{2}

; ammonia is also required.

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