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Q.

Is it true that solid sodium hydroxide (NaOH) is hygroscopic?


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answer is A.

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Detailed Solution

The above statement is true.
Solid sodium hydroxide can absorb moisture from the environment because it is hygroscopic. Once it has absorbed some moisture, carbon dioxide, which is constantly present in the air, is also absorbed. It is made using the Chlor-alkali method.
2NaCl   +  2H2O    →     2NaOH  +    Cl2    +   H2
2NaOH  +  CO2    →     2Na2CO3    +   H2O
NaOH reacts with acidic oxide (CO)2  to form salt and water. This reaction is called a neutralisation reaction.
 
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Is it true that solid sodium hydroxide (NaOH) is hygroscopic?