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Statement-1: Boron has a smaller first i...

Statement-1: Boron has a smaller first ionisation enthalpy than beryllium.
Statement-2: The penetration of a 2s electron to the nucleus is more than the 2p electron hence 2p electron is more shielded by the inner core of electrons than the 2s electrons.

A

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

B

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

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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Explore conceptually related problems

Al has a smaller first ionization enthalpy than Mg. Consider the following statements : I. It is easier to remove 3p electron than 3s electron . II . 3p electron of Al is more shielded from the nucleus by the inner coreof electron than the 3s electrons of Mg III. 3s electron hasmore penetration power than 3p electron IV. Atomic radius of Al is more than Mg ( atomic number Al=13, Mg = 12 ) The correct statements are :

The inner electrons are shielded to a "______" extent than the outer electrons.

Knowledge Check

  • Assertion: Boron has a smaller first ionisation enthalpy than beryllium. Reason: The penetration of a 2s electron to the nucleus is more than the 2p electron, hence 2p electorn is more shielded by the inner core of electrons than the 2s electrons.

    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 (A) : Boron has smaller first ionisation enthalpy than beryllium Reason ( R ) : The penetration of a 2s electron to the nucleus is more than the 2p electron hence 2p- electron is more shielded by the inner core of electrons than 2s electrons .

    A
    Assertion and reason both are correct statement but reason is not correct explanation for assertion
    B
    Assertion is correct statement but reason is wrong statement.
    C
    Assertion and reason both are correct statement and reason is correct explanation for assertion
    D
    Assertion is reason both are wrong statements.

  • B has a smaller first ionization enthalpy than Be. Consider the following statements (i) it is easier to remove 2p electron than 2s electron (ii) 2p electron of B is more shielded from the nucleus by the inner core of electrons than the 2s electrons of Be (iii) 2s electron has more penetration power than 2p electron (iv) atomic radius of B is more than Be (atomic number B= 5, Be = 4) The correct statements are

    A
    (i),(ii) and (iv)
    B
    (i),(iii) and (iv)
    C
    (i),(ii) and (iii)
    D
    (ii),(iii) and (iv)

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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.

    Which of the following has more electrons than neutrons?

    Statement-1: Fluorine has a less negative electron gain enthalpy than chlorine. Statement-2: There is relative greater effectivebess of 2p-electrons in the small F atom to repel the additional electron entering the atom than to 3p-electrons in the large CI atom.

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