When $N a O H$ is used in making of soap, it is called as:

alkali soap

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soft soap

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hard soap

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none of above

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Solution

The correct option is B hard soap
Soaps are sodium or potassium salts of long chain fatty acids. When triglycerides in fat/oil react with aqueous $N a O H$ or $K O H$ , they are converted into soap and glycerol. The sodium salt of long chain fatty acid is known as hard soap. It is difficult to dissolve in water. It is used as laundry soap.

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