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
- Washing soda and dead burnt plaster.
- Baking soda and soda as.
The Correct Option is B
Solution and Explanation
Heating Y above 373 K gives anhydrous Na2CO3 (Z), a white powder known as soda ash.
Baking soda (NaHCO3) is not a hydrate, and dead burnt plaster (anhydrous CaSO4) comes from gypsum via plaster of Paris (hemihydrate), not a monohydrate.
Answer: (2) Washing soda and soda ash
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