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Question

1 gram of a carbonate of a metal was dissolved in 25 ml of 1N HCl. The resulting liquid required 5 ml of N NaOH for neutralization. The eq. wt. of metal carbonate is__________.

A
100
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B
30
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C
40
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D
50
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Solution

The correct option is C 50
Equivalents of metal carbonate + equivalents of HCl = Equivalents of NaOH

1Weq+25×103×1=5×103×1

1Weq=20×103

Weq=50 gm/mol

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