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Q.

The hydrated salt $N a_{2} C O_{3} . x H_{2} O$ undergoes 63% loss in mass on heating and becomes anhydrous. The value of x is:

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a

8

b

12

c

10

d

18

answer is A.

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Detailed Solution

Loss in mass is due to loss of water=63.1

% of $H_{2} O = 63 = \frac{18 x}{106 + 18 x} \times 100 \Rightarrow x = 10$

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The hydrated salt Na2CO3.xH2O undergoes 63% loss in mass on heating and becomes anhydrous. The value of x is: