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Assertion (A) : Electrochemistry is the ...

Assertion (A) : Electrochemistry is the study of production of electricity from energy released during spontaneous chemical reactions.
Reason (R) : Study of electrochemistry is important for creating new technologies.

A

Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).

B

Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A)

C

Assertion (A) is correct, but Reason (R) is incorrect statement.

D

Assertion (A) is incorrect, but Reason (R) is correct statement.

Text Solution

Verified by Experts

The correct Answer is:
B
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Assertion (A): Decrease in free energy causes spontaneous reaction Reason (R ) : Spontaneous reactions are invariably exothermic.

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Knowledge Check

  • Assertion (A) : Electrolytical cell is a device for using electrical energy to carry non-spontaneous chemical reactions. Reason (R) : We can construct innumerable number of galvanic cells on the pattern of Daniel cell by taking combinations of different half-cells.

    A
    Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).
    B
    Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A)
    C
    Assertion (A) is correct, but Reason (R) is incorrect statement.
    D
    Assertion (A) is incorrect, but Reason (R) is correct statement.

  • Assertion:Electrolytic cell uses electrical energy to carry non-spontaneous chemical reactions. Reason : Chemical energy of a spontaneous redox reaction can be converted into electrical energy.

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

  • Assertion : Dry cell is used to convert chemical energy into electrical energy . Reason Chemical reactions occur in the electrolyte of the dry cell that generate electricity .

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

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    Assertion (A) : Batteries and fuel cells convert chemical energy into electrical energy. Reason (R) : The reactions carried out electrochemically are not energy efficient and more polluting.

    Assertion (A), study of discharge of electricity through gases at low pressure resulted in the discovery of cathod rays . Reason (R ): cathod rays are deflected by both magnetic and electric fields and the direction of deflection shows that they are nagatievly charged .

    Assertion (A) : Arrhenius equation explains the temperature dependence of rate of a chemical reaction. Reason (R ) : Plot of log k versus 1//T are linear and energy of activation is obtained from such graphs.

    Assertion (A) : Many of photochemical changes have positive sign of Delta G , yet they are spontaneous Reason (R) : The activation energy in photochemical reaction is provided by light energy.

    Assertion (A) : The rate of reaction can also increase w.r.t its product if one of the products act as catalyst Reason (R) : A catalyst lowers the activation energy of reactions.

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