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Assertion (A) : The first ionization ene...

Assertion (A) : The first ionization energy of Al is lower than Mg.
Reason (R ) : Atomic radius of Al is smaller than Mg.

A

Both (A) and (R) are true and R is correct explanation of R

B

Both (A) and (R ) are true but R is not the correct explanation of A

C

(A) is true R is false

D

Both (A) and (R ) are false .

Text Solution

Verified by Experts

The correct Answer is:
b
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Knowledge Check

  • The first ionization enthalpy of Na, Mg, Al and Si are in order.

    A
    `NaltMgltAlgtSi`
    B
    `NagtMggtAlgtSi`
    C
    `NaltMgltAlltSi`
    D
    `NaltMggtAlltSi`

  • The ionisation energy of Ga is higher than that of Al because of _______

    A
    more effective nuclear charge of Ga
    B
    smaller atomic size of Ga
    C
    larger size of Ga
    D
    both (a) and (b)

  • Assertion : Ionization energy increase does the group. Reason : Atomic size increases down the group.

    A
    Both Assertion and Reason are ture and Reason is correct explanation of Assertion.
    B
    Both Assertion and Reason are true but Reason is ot the correct explanation of Assertion.
    C
    Assertion is true but Reason is false.
    D
    Assertion is false but reason is true.

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    Explore conceptually related problems

    Why first ionization enthalpy of chromium is lower than that of zinc?

    Why first ionization enthalpy of chromium is lower than that of zinc ?

    Compare the first ionization energies of Carbon and Boron and give reason.

    Why the first ionization energy of alkaline earth metals higher than that of Ist group.

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