The electrochemical equivalent of a metal is 3.3 x 10-7 kg per coulomb. The mass of the metal liberated at the cathode when a 3 A current is passed for 2 second will be

  • Option 1)

    19.8 x 10-7 kg

  • Option 2)

    9.9 x 10-7 kg

  • Option 3)

    6.6 x 10-7 kg

  • Option 4)

    1.1 x 10-7 kg

 

Answers (1)

As we learnt in

if R=r -

P_{max}=\frac{E^{2}}{4r}

- wherein

Power delivered will be maximum

 

m=zit

m=\left ( 3.3\times 10^{-7} \right ) \times 3\times 2

m= 19.8\times 10^{-7} kg

 

 


Option 1)

19.8 x 10-7 kg

This option is correct.

Option 2)

9.9 x 10-7 kg

This option is incorrect.

Option 3)

6.6 x 10-7 kg

This option is incorrect.

Option 4)

1.1 x 10-7 kg

This option is incorrect.

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