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Chromium metal can be plated out from an...

Chromium metal can be plated out from an acidic solution containing `CrO_(3)` according to the following the reaction:
`CrO_(3) + 6H^(+) + 6e^(-) rarr Cr + 3H_(2)O`
How long will it take to plate out 1.5 gm of Cr using 12.5 ampere current ? (Atomic weight of Cr =52, 1F =96500 C)

Text Solution

Verified by Experts

The correct Answer is:
A, C
Eq. wt of Cr `=("Atomic weight")/("Change in oxidation number per mole")= (52)/(6) therefore 96500" coulomb deposit"=(52)/(6)"gm (Cr)"`
`W_(cr)=1.5gm, I=12.5" ampere"`
`E_(cr)=(52)/(6), t=?`
`W=("Eit")/(96500) rArr 1.5 =(52 xx 12.5 xx t)/(6 xx 96500) therefore t=1336.15sec`
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