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Statement-1 : First Ionisation energy of...

Statement-1 : First Ionisation energy of beryllium is more than boron.
Statement-2 : In boron, 2p orbital is fully filled, whereas, in beryllium, it is not fully filled.

A

Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-1

B

Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1

C

Statement-1 is True, Statement-2 is False

D

Statement-1 is False, Statement-2 is True

Text Solution

Verified by Experts

The correct Answer is:
C
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The first ionisation energy of beryllium is more than that of boron because

First ionisation energy of boron is less than Be but size of Be is less than Boron. Why ?

Knowledge Check

  • Statement 1: The first ionization energy of B is less than Be. Statement 2: 2p orbital lower in energy than 2s.

    A
    Statement-1 is Ture, Statement 2 is True, Statemnet -2 is correct explanation for Statement -1
    B
    Statement -1 is Ture, Statement -2 is True, Statement -2 is NOT a correct explanation for Statement -1
    C
    Statement -1 is true. Statement -2 is false
    D
    Statement -1 is false, Statement -2 is True

  • Assertion (A): First ionisation energy of beryllium is greater than that of boron. Reanos (R): Boron has larger size than beryllium.

    A
    (a) Both A and R are true and R is the correct
    explanation of A
    B
    (b) both A and R are true and R is not the correct
    explanation of A
    C
    (c) A is true, R is false
    D
    (d) Ais false, R is true

  • Assertion :- The first ionization energy of Be is greater than that of B 2p- orbital is lower in energy when 2s- orbital.

    A
    If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
    B
    If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.
    C
    If Assertion is True, but the Reason is False.
    D
    If both Assertion & Reason are false

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    The ionization energy of boron is less than that of beryllium because:

    The ionization energy of boron is less than that of beryllium because:

    Assertion: The first ionisation energy of Be is greater than boron. Reason: 2p-orbitals have lower energy than 2s-orbital

    Assertion: The first ionisation energy of Be is greater than that of B . Reason: 2p-orbital is lower in energy than 2s-orbital.

    Statement-1: The ionisation potential of Sn is greater than Pb. Statement-2: Usually, ionisation energy decreases down the group.

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