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Assertion: F atom has less negative elec...

Assertion: `F` atom has less negative electron gain enthaply than `Cl` atom.
Reason: Additional eletrons are repelled more effectively by 3 p-electronic in `Cl` than by `2` p-electrons is `F` atom.

A

Statement-I is true, Statement-II is true ,Statement -II is the correct explanation for Statement-I

B

Statement-I is true ,Statement -II is true, Statement -II is not the correct explanation for statement -II

C

Statement-I is true. Statement -II is false.

D

Statement-I is false. Statement -II is true.

Text Solution

Verified by Experts

The correct Answer is:
C
Statement II is incorrect. In general, the electron affinity decreases down the group but the electron affinity for chlorine is more than that for fluorine, and similarly the electron affinity for sulphur is more than that for oxygen because in F and S, due to very small size of the atom. The are strong electron-electron repulsion in the relatively small `2p` orbitals of F and thus, the incoming electron does not experience much attraction. Hence, the incoming electron is not added easily as it is added in large `3p` orbital of Cl.
Consequently, the `Delta_(eg)H^(ɵ)` or EA of F is less negative than that of Cl.
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In each of the following questions a Statement of Assertion (A ) is given followed by a corresponding statement of Reason (R ) Just below it . Of the statement mark the correct answer as Assertion . F atom has less negative electron gain enthalpy than C1 atom. Reason . Additional electrons are repelled more effectively by 3p- electrons in C1 than by 2p- electrons in F atom

S has more negative electron gain enthalpy than O why ?

Knowledge Check

  • Assertion: F atom has less negative electron gain enthaply than Ci atom. Reason: Additional eletrons are repelled more effectively by 3 p-electronic in Ci than by 2 p-electrons is F atom.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion
    B
    If the 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 assertion is false but reason is true.

  • Assertion: F atom has a less negative electron affinity than CI atom. Reason: Additional electrons are repelled more effectival by 3p electrons in CI atom than by 2p electrons in F atom.

    A
    Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.
    B
    Both Assertion and Reason are true, but Reason is not correct explanation of Assertion.
    C
    Assertion is true but Reason is false.
    D
    Assertion is false but Reason is true.

  • Statement 1: F atom has a less negative electron affinity than Cl atom statement 2: Additional electrons are repelled more effectively by 3p electrons in Cl atom than by electrons in F atoms

    A
    Statement 1 is true, statement 2 is true, statement 2 si a correct explanation for statement 5
    B
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    C
    Statement 1 is true, statement 2 is false
    D
    Statement 1 is false, statement 2 is true

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    Statement-1 : F arom has a less negative electron gain enthalpy than Cl atom. Statement-2 : Additional electron is repelled more efficiently by 3p electron in Cl atom than by 2p electron in F atom.

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