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Equivalent Mass

10g of a meta...

Question

10g of a metal carbonate on heating gives 5.6 g of its oxide. The equivalent mass of the metal is ?

A

40

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B

20

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C

10

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D

5

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Solution

The correct option is B
20

$\frac{M a s s o f m e t a l c a r b o n a t e}{E q u i v . m a s s o f m e t a l c a r b o n a t e}$
$= \frac{M a s s o f m e t a l o x i d e}{E q u i v . m a s s o f m e t a l o x i d e}$
or $\frac{10}{E_{M} + E_{C O_{3}^{2 -}}} = \frac{10}{E_{M} + 30} = \frac{5.6}{E_{M} + E_{O}}$
$= \frac{5.6}{E . M + E_{O}} = \frac{5.6}{E_{M} + 8} \Rightarrow E_{M} = 20$

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Equivalent Mass

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