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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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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JEE Mains Previous Paper 1 (Held On: 10 Apr 2019 Shift 2)

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Washing soda and soda ash.
Baking soda and dead burnt plaster.
Washing soda and dead burnt plaster.
Baking soda and soda ash.

Answer 1

Concept:

The reaction is given below:

Na₂ CO₃.10H₂O ⟶ Na₂ CO₃.H₂O + 9H₂O

(X) (Y)

Na₂ CO₃.H₂O ⟶ Na₂ CO₃+ H₂O

(Y) (Z)

Here, X represents Washing soda

Y represents Washing soda (monohydrated)

and Z represents Soda ash

When washing soda is heated which undergoes dehydrogenation to form washing soda. Then again heated above 373 K to form sodium carbonate powder with very less water content that is soda ash.

Thus, the required X and Z are Washing soda and soda ash respectively.

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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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