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Q.

Sodium compound (A) is efflorescent, white crystalline solid. On heating it forms hydrated compound (B). Further heating above 373 K  anhydrous salt (C) is formed.(C) when heated to 1124 K melts without decomposing. Identify (B) and (C).

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a

B = Na2CO3 ; C = Na2CO3 . H2O

b

B = Na2CO3 .10H2O ; C = Na2CO3 .H2O

c

B = Na2CO3 .H2O ; C = Na2CO3

d

B = Na2CO3 .10H2O ; C = Na2CO3

answer is C.

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Detailed Solution

A = Na2CO3 .10H2O ; B = Na2CO3 .H2O ; C =  Na2CO3

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Sodium compound (A) is efflorescent, white crystalline solid. On heating it forms hydrated compound (B). Further heating above 373 K  anhydrous salt (C) is formed.(C) when heated to 1124 K melts without decomposing. Identify (B) and (C).