On passing 3 A of electricity for 50 min, 1.8 g metal deposits. The equivalent mass of metal is

Options

A. 9.3
B. 19.3
C. 38.3
D. 39.9

Answer

B

Explanation

`w_("metal")= (E xx I xx t)/(96500)= ( E xx 3 xx 50 xx 60)/(96500)`
`:. E= (96500 xx w)/( 3 xx 50 xx 60) = (96500 xx 1.8)/( 3 xx 50 xx 60)= 19.3`