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How many grams of nickel are deposited b...

How many grams of nickel are deposited by a current of 100 milliampere in 20 minutes in the electrolysis of aqueous nickel sulphate solution ? (Given atomic mass of Ni =58.7 amu.)

Text Solution

Verified by Experts

The correct Answer is:
0.0365 g
The reaction at the cathode is :
`underset(1mol)Ni^(2+)(aq)+underset((2 Faradays))underset(2mol)(2e^(-))to underset((58.7 g))underset(1mol)(Ni(s))`
Quantity of charge passed (Q)`="Current in ampere" xx"time in seconds "`
`=(100//1000 amp.)xx(20xx60 s)=120 As =120 C`
`2xx96500 C` of charge deposit Ni=58.7 g
120 C of charge Ni`=((58.7 g))/((2xx96500C))xx(120C)=0.0365 g`.
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Knowledge Check

  • 30 mL of 0.13 M NiSO_(4) is electrolysed using a current of 360 milliamperes for 35.3 minutes. The mass of the metal that would have been plated out if current efficiency is only 60% ( Ni = 58.7 u ) is

    A
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    B
    `0.3911 g`
    C
    `0.1391 g`
    D
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  • The amount of metal deposited at cathode on passing electric current of 0.75 ampere in aqueous ferris sulphate solution for 30 mintes, will be. (atomic weight of Fe=56)

    A
    0.00435 g
    B
    0.261 g
    C
    0.783 g
    D
    0.522 g

  • 0.169 gram of copper is deposited on the cathode by a current of 32 milliamperes passing for 5 hours through a solution of copper sulphate. Determing the current efficiency. [ Atomic weight of Cu=63.6]

    A
    `98%`
    B
    `78%`
    C
    `69%`
    D
    `89%`