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Explain the following. On expose to air, caustic soda becomes liquid and after some time it changes to white powder.
Correct Answer: 0
PLACEHOLDER ANSWER - the answer is an explanation. Caustic soda is deliquescent; it absorbs so much moisture from the air that it dissolves in it and becomes liquid. The solution then absorbs carbon dioxide from the air, $$2\text{NaOH} + \text{CO}_2 \rightarrow \text{Na}_2\text{CO}_3 + \text{H}_2\text{O}$$. Sodium carbonate is not deliquescent and, losing water, it is left as a white powder.
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