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

1. Baking soda and dead burnt plaster.
2. Washing soda and soda ash
3. Washing soda and dead burnt plaster.
4. Baking soda and soda as.

Correct answer: Washing soda and soda ash

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