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Assertion(A): Whne acidified ZnSO(4) sol...

Assertion`(A):` Whne acidified `ZnSO_(4)` solution is electrolyzed between `Zn` electrodes, it is `Zn` that is deposited at the cathode and `H_(2)(g)` is not evolved.
Reason `(R):` The electrode potential of `Zn` is more negative than hydrogen as the overpotential for hydrogen evolution in `Zn` is quite large.

A

If both `(A)` and `(R)` are correct, and `(R)` is the correct explanation of `(A)`.

B

If both `(A)` and `(R)` are correct, but `(R)` is not the correct explanation of `(A)`.

C

If `(A)` is correct, but `(R)` is incorrect.

D

If `(A)` is incorrect, `(R)` is correct.

Text Solution

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The correct Answer is:
C
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Knowledge Check

  • Statement-1: When acidified zinc sulphate solution is electrolysed between zinc electrodes, it is zinc that is deposited at the cathode and no H_(2) gas is evolved. Statement-2: The electrode potential of zinc is more negative than that of hydrogen as the overvoltage for the H_(2) evolution on zinc is quite large.

    A
    Statement-1 is True, statement-2 is true, statement-2 is a correct explanation of statement-1
    B
    Statement-1 is true, statement-2 is true, statement-2 is not a correct explanation of statement-1.
    C
    Statement-1 is true, statemet-2 is false
    D
    Statement-1 is false, statement-2 is true

  • Assertion: When acidified zinc sulphate solution is electrolysed between zinc electrodes, it is zinc that is deposited at the cathode and hydrogen evolution does not take place. Reason: The electrode potential of zinc is more negative than hydrogen as the overvoltage for the hydrogen as the evolution on zinc is quite large.

    A
    if both assertion and reason are true and the reason is the correct explanation of the assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of the assertion.
    C
    If assertion is true but reason is false
    D
    If the assertion and reason both are false.

  • Assertion (A) : Galvanized iron does not rust. Reason (R): Zn has a more negative electrode potential than Fe .

    A
    If both `(A)` and `(R)` are correct, and `(R)` is the correct explanation of `(A)`.
    B
    If both `(A)` and `(R)` are correct, but `(R)` is not the correct explanation of `(A)`.
    C
    If `(A)` is correct, but `(R)` is incorrect.
    D
    If `(A)` is incorrect, `(R)` is correct.
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