Al has a smaller first ionization enthal...

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 `:`

I, II and IV

I,II and III

II, III and IV

I, III and IV

Text Solution

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(I) Electron from 3p can be removed more easily than from 3s, as nucleus shows less attraction towards 3p electrons than 3s electron.Hence Al has smaller first Ionization enthalpy.
(II) Shielding of 3p is more than 3s
(III) Order of penetration power `: s gt p gt d gt f `
(IV) Atomic Radius of Al is less than Mg
Hence, It is an incorrect option.
Correct option is (B ) , (I) , (II) and (III)

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

(i),(ii) and (iv)

(i),(iii) and (iv)

(i),(ii) and (iii)

(ii),(iii) and (iv)

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.

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

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

Statement-1 is True, Statement-2 is False

Statement-1 is False, Statement-2 is True

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.

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

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

If assertion is true but reason is false.

If assertion is false but reason is true.

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Knowledge Check

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.

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.

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