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Question:

A hydrated solid X on heating initially gives a monohydrated compound Y. Y upon heating above 373 K leads to an anhydrous white powder Z. X and Z, respectively, are:

washing soda and dead burnt plaster

washing soda and soda ash

baking soda and soda ash

baking soda and dead burnt plaster

Solution:

Correct option is A. washing soda and soda ash