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INERT PAIR EFFECT...

INERT PAIR EFFECT

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In the elements of 4th, 5th, and 6th period of the p-block elements which come after d-block elements, the electrons present in the intervening d- and f-orbitals do not shield the s-electron of the valence shell effecitively.
As a result, `ns^(2)`-electrons remains more tightly held by the nucleus and hence do not participate in bonding. This is called inert pair effect.
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Knowledge Check

  • Assertion (A) : Addition of an inert gas to the equilibrium mixture has no effect on the state of equilibrium at constant volume or at constant pressure. Reason (R ) : The addition of inert gas at constant volume will not alter the concentrations of the reactants as well as products of a reaction mixture.

    A
    Both A and R are true and R is the correct explanation of A.
    B
    Both A and R are true but R is not a correct explanation of A.
    C
    A is true but R is false
    D
    A is false but R is true.

  • Directions : This contain Assertion and Reason type question, Each question has 4 choices (1),(2),(3) and (4), out of which only one correct. Assertion (A) On going down the group-13, inert pair effect decreases. Reason ( R ) On moving down the group, stability of compounds in higher oxidation state increases.

    A
    Both Assertion and Reason are correct and Reason is the correct
    B
    Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion
    C
    Assertion is correct but Reason is incorrect
    D
    Both Assertion and Reason are incorrect

  • The heavier elements of groups 13 and 14 besides the group oxidation state exhibit another oxidation state which is two units lower than the group oxidation state and the stability of this lower oxidation state increases down the group. This concept which is commonly called inert pair effect has been used to explain many physical and chemical properties of the element of these groups. The oxides which is the strongest acid is

    A
    `Tl_(2)O_(3)`
    B
    `PbO_(2)`
    C
    `CO_(2)` is a greenhouse gas
    D
    `SnO_(2)`

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