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A hydrated solid \mathrm{x} on heating initially gives a monohydrated Compound \mathrm{Y}. \mathrm{y}upon heating above \mathrm{373 \mathrm{~K}} leads to an anhydrous white powder \mathrm{ z} .\mathrm{x\: and\: z} respectively are -
 

Option: 1

baking soda and soda ash
 


Option: 2

washing soda and soda ash
 


Option: 3

baking soda and dead burnt plaster
 


Option: 4

washing soda and dead burnt plaster


Answers (1)

best_answer


Baking Soda \left(\mathrm{NaHCO}_3\right) is not a hydrated solid. Thus \mathrm{x} is not baking soda. Thus option (a) and (c) are in correct.

Bead burnt plaster \mathrm{CaSo_4} is obtained from gypsum via the formation of plaster of paris.
\mathrm{{ CaSo_4. } 2 \mathrm{H}_2 \mathrm{O} \stackrel{38 \mathrm{K}}{\longrightarrow} { CaSo_4 } \cdot \frac{1}{2} \mathrm{H}_2 \mathrm{O} \stackrel{393 \mathrm{~K}}{\longrightarrow} \mathrm{CaSO}_4 }
Therefore, the reaction taker place an follows:-

\mathrm{ \mathrm{Na}_2 \mathrm{CO}_3 \cdot 10 \mathrm{H}_2 \mathrm{O} \stackrel{< 373 \mathrm{~K}}{\longrightarrow} \mathrm{Na}_2 \mathrm{CO}_3 \cdot \mathrm{H}_2 \mathrm{O} \stackrel{> 373 \mathrm{~K}}{\longrightarrow} \mathrm{Na}_2 \mathrm{CO}_3 }

Hence option 4 is correct.

Posted by

Ritika Jonwal

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