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Question

0.622 g of a metal carbonate on heating gives 0.466 g of its oxide and some CO2. Calculate the equivalent weight of the metal.

A
150.2 g
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B
82.80 g
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C
56.60 g
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D
57.69 g
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Solution

The correct option is D 57.69 g
Let the equivalent weight of the metal be denoted by M
Equivalent weight of carbonate ion =CO23=30 g

weight of the metal carbonateweight of the metal oxide=equivalent weight of the metal carbonateequivalent weight of the metal oxide

0.6220.466=M+30M+8

On solving, M=57.69 g

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