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Assertion : 2^(nd) period elements do no...

Assertion : `2^(nd)` period elements do not involve in excitation of electron.
Reason : `2^(nd)` period elements do not have vacant 2d-orbitals.

A

If assertion is true but the reason is false

B

If assertion is false but reason is true

C

IF both assertion and reason are true and the reason is the correct explanation of assertion

D

If both assertion and reason are true but reason is not the correct explanation of assertion

Text Solution

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The correct Answer is:
B
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Assertion : The compounds of noble gas element neon are not known. Reason : Neon does not have any vacant orbital in the valence shell of its atom.

Knowledge Check

  • Assertion : Elemental nitrogen exist as a diatomic molecule and phospours as tetratomic molecule. Reason :Nitrogen does not have vacant d-orbital wheras phosphorus have vacant d-orbital.

    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 assertion is false but reason is true.

  • Which 2nd period element has maximum value of |ionization energy - electrone affinity|

    A
    Li
    B
    N
    C
    F
    D
    Ne

  • Assertion (A): Sixth and seventh periods in the periodic table contains 14 elements. Reason (R): In the periodic table, 14 elements of sixth and seventh periods are known as lanthanoids and actinoids.

    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 the correct explanation of A.
    C
    A is true but R is false.
    D
    A is false and R is true.

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