A solution of a salt of a metal was electrolysed for 150 minutes with a current of 0.15 amperes. The weight of metal deposited was 0.783 g. The equivalent weight of the metal is
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a
55.97 g
b
65.97 g
c
75.97 g
d
85.97 g
answer is A.
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Detailed Solution
Time (t) = 150 min = 9000 secCurrent (I) = 0.15 AWeight of metal (w) = 0.783 gWe know Q=I×t=0.15×9000=1350 C. 1350 C of electricity will deposit 0.783 g of metal, so 96500 C of electricity will deposit 0.783×965001350=55.97 g