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Q.

 The value of x, if hydrated salt A2SO4 · xH2O undergoes 46% loss in mass on heating and becomes anhydrous, is : (where atomic weight of A is 7).

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a

8

b

10

c

9

d

5

answer is D.

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Detailed Solution

The complete reaction with x,

A2SO4⋅xH2O→A2SO4+x

18x110+18x×100

=45⇒x=5

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 The value of x, if hydrated salt A2SO4 · xH2O undergoes 46% loss in mass on heating and becomes anhydrous, is : (where atomic weight of A is 7).