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:

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Baking soda and dead burnt plaster

Washing soda and soda ash.

Baking soda and soda ash.

Washing soda and dead burnt plaster.

answer is A.

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Detailed Solution

$\begin{array}{l} \underset{(X)}{{Na}_{2} {CO}_{3} \cdot 10 H_{2} O} \to {Na}_{2} {CO}_{3} \cdot \underset{(Y)}{H_{2} O} + 9 H_{2} O \\ \underset{(Y)}{{Na}_{2} {CO}_{3} \cdot H_{2} O} \to \underset{(Z)}{{Na}_{2} {CO}_{3} \cdot H_{2} O + H_{2} O} \end{array}$ $= Washing Soda , Soda ash$

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