The standard solution of sodium hydroxide cannot be prepared by direct weighing of cold sodium hydroxide because it is :

a solid

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a liquid

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deliquescent

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none of the above

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Solution

The correct option is D deliquescent
Sodium hydroxide is a deliquescent solid. When it comes in contact with air, it absorbs moisture and carbon dioxide from the air to form sodium carbonate.

Hence, the standard solution of sodium hydroxide cannot be prepared by direct weighing of cold $N a O H$ . It is a secondary standard substance.

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