1.

A layer of chromium metal 0.25 mm thick is to be plated on an auto bumper with a total area 0.32m^(2) from a solution containing CrO_4^(2-) ? What current flow is required for this electroplate if bumper is to be plated in 60s ? The density of churomnium metal is 7.20g / cm^(3)

Answer»

`4.9 XX 10^(3) A `
`1.78 xx 10^(3) A`
`5.3 xx 10^(4) A `
`10.69 xx 10^(4) A`

SOLUTION :`W = d xx v = 7.2 xx ((0.25)/(10) xx 0.32 xx 100 xx 100) = 576 gm `
` 6 xx 96500 to 52 gm , Q to 576 gm `
`Q = 6413538.46 = C xx t ,C =( 6413538. 46)/(60) = 1.0689 xx 10^(5) = 10.689 xx 10^(4)`


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