Q.

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


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a

True

b

False 

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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