Question

when a current of 0.15amperes passed a through a salt of meyal for 150 minutes 0.783g of metal was deposited .find the valency of the metal​

Answer 1

Answer:

Correct option is

B

2

Given mass=0.788g

Current(I) =1.5ampere

Time(t)=15min=900sec

Atomic Mass=112

Formula:-

Mass=

F

E

×I×t [E=EquivalentWeight,F=Faraday=96500C,1C=1ampere×1sec]

∴0.788g=

96500C

E

×1.5×900(C)

∴

1.5×900

0.788×96500

=E

∴E=56.3

Equivalent Weight=

Valency

Atomicmass

∴Valency=

Equivalentweight

Atomicmass

=

56.3

112

=2