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The hydrated salt Na2CO3.xH2O undergoes 630/o loss in mass on heating and becomes anhydrous. The value of x is:

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a

10

b

12

c

8

d

18

answer is A.

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Detailed Solution

Na2CO3⋅xH2O(s)⟶Na2CO3(s) +xH2O(g)Let 100 g of Na2CO3.xH2O be present∴100x106+18x mole of H2O formed63=100x106+18x(18)6678+1134x=1800x666x=6678x≃10

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The hydrated salt Na2CO3.xH2O undergoes 630/o loss in mass on heating and becomes anhydrous. The value of x is: