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While preparing soap in the laboratory , sonia added X to vegetable oil and stirred the mixture. She observed that the test tube became hot , then she

added sodium chloride and after sometime Y settled at the bottom of test tube.The substances X and Y are :

a)Sodium carbonate and soap.
b)Sodium hydroxide and glycerol
c)Sodium Carbonate and soap.
d)Sodium hydroxide and soap.


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In preparation of soap, NaOH(X) is added to vegetable oil. And obviously the final product is soap(Y).
Correct option is D.
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