9.65C of electric current is passed through fused anhydrous magnesium chloride. The magnesium metal thus obtained is completely converted into Grignard reagen t. the number of m oles of the original reagent obtained of

Options

A. `5 xx 10^(-4)`
B. `1 xx 10^(4)`
C. `5 xx 10^(-5)`
D. `1 xx 10^(-5)`

Answer

C

Explanation

`W = Z xx I xx t`
where `Z = ("equivalent wt")/F = 12/96500`
`I xx t = 9.65 C`
`therefore 12/96500 xx 9.65 g = 12 xx 10^(-4) g`
24 g of `Mg^(2+)` = 1 mole of `Mg^(2+)`
`1/24 xx 12 xx 10^(-4)` mole
= `5 xx 10^(-5)` mole