QBManager

CHXI11:THE P-BLOCK ELEMENTS

316476 $Al$ and $Ga$ have same covalent radii because of

1 Greater shielding power of s-electrons of

Ga

atoms

2 Poor shielding power of s-electrons of

Ga

atoms

3 Greater shielding power of d-electrons of

Ga

atoms

4 Poor shielding power of d-electrons of

Ga

atoms

Explanation:

Due to poor shielding effect of d -electrons in case of $Ga$ , the valence electrons are attracted more strongly and hence the size is not increased.

CHXI11:THE P-BLOCK ELEMENTS

316477 The correct order of atomic radii in group 13 elements is

1

B < Ga < Al < Tl < In

2

B < Ga < Al < In < Tl

3

B < Al < Ga < In < Tl

4

B < Al < In < Ga < Tl

Explanation:

Atomic radius of $Al >$ Atomic radius $Ga$
Expected $B < Al < Ga < In < Tl$
Observed $B < Ga < Al < In < Tl$

NEET - 2018

CHXI11:THE P-BLOCK ELEMENTS

316478 Assertion :
The ionisation energy of gallium remains nearly same as that of aluminium.
Reason :
This is due to shielding of outer shell electrons from the nucleus by the d-electrons of gallium.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

In case of $Ga$ , there are $10 d$ -electrons in the penultimate energy shell which shield the nuclear charge less effectively. The outer electron is held firmly by the nucleus. As a result the ionisation energy remains nearly the same as that of aluminium. So, option (1) is correct.

CHXI11:THE P-BLOCK ELEMENTS

316479 The element whose atomic volume is least is

1 Boron

2 Aluminium

3 Gallium

4 Thallium

CHXI11:THE P-BLOCK ELEMENTS

316480 The correct order of the first ionisation enthalpy is

1

Al > Ga > Tl

2

Tl > Ga > Al

3

Ga > Al > B

4 B

> Al >

Ga

Explanation:

supporting img
The ionisation enthalpy decreases from B to Al due to increase in atomic size. The ionisation energy of Ga is slightly higher than that of Al due to ineffective screening of 3 d -electrons.
In Tl , the nuclear charge increases considerably which outweighs the screening effect of all the electrons of the inner shells. Hence, ionisation enthalpy of Tl is much higher than $Al, Ga$ , In.
So, correct order is $B > Tl > Ga > Al > In$ . So, the correct option is (2)

JEE Main - 2024

CHXI11:THE P-BLOCK ELEMENTS

316476 $Al$ and $Ga$ have same covalent radii because of

1 Greater shielding power of s-electrons of

Ga

atoms

2 Poor shielding power of s-electrons of

Ga

atoms

3 Greater shielding power of d-electrons of

Ga

atoms

4 Poor shielding power of d-electrons of

Ga

atoms

Explanation:

Due to poor shielding effect of d -electrons in case of $Ga$ , the valence electrons are attracted more strongly and hence the size is not increased.

CHXI11:THE P-BLOCK ELEMENTS

316477 The correct order of atomic radii in group 13 elements is

1

B < Ga < Al < Tl < In

2

B < Ga < Al < In < Tl

3

B < Al < Ga < In < Tl

4

B < Al < In < Ga < Tl

Explanation:

Atomic radius of $Al >$ Atomic radius $Ga$
Expected $B < Al < Ga < In < Tl$
Observed $B < Ga < Al < In < Tl$

NEET - 2018

CHXI11:THE P-BLOCK ELEMENTS

316478 Assertion :
The ionisation energy of gallium remains nearly same as that of aluminium.
Reason :
This is due to shielding of outer shell electrons from the nucleus by the d-electrons of gallium.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

In case of $Ga$ , there are $10 d$ -electrons in the penultimate energy shell which shield the nuclear charge less effectively. The outer electron is held firmly by the nucleus. As a result the ionisation energy remains nearly the same as that of aluminium. So, option (1) is correct.

CHXI11:THE P-BLOCK ELEMENTS

316479 The element whose atomic volume is least is

1 Boron

2 Aluminium

3 Gallium

4 Thallium

CHXI11:THE P-BLOCK ELEMENTS

316480 The correct order of the first ionisation enthalpy is

1

Al > Ga > Tl

2

Tl > Ga > Al

3

Ga > Al > B

4 B

> Al >

Ga

Explanation:

supporting img
The ionisation enthalpy decreases from B to Al due to increase in atomic size. The ionisation energy of Ga is slightly higher than that of Al due to ineffective screening of 3 d -electrons.
In Tl , the nuclear charge increases considerably which outweighs the screening effect of all the electrons of the inner shells. Hence, ionisation enthalpy of Tl is much higher than $Al, Ga$ , In.
So, correct order is $B > Tl > Ga > Al > In$ . So, the correct option is (2)

JEE Main - 2024

CHXI11:THE P-BLOCK ELEMENTS

316476 $Al$ and $Ga$ have same covalent radii because of

1 Greater shielding power of s-electrons of

Ga

atoms

2 Poor shielding power of s-electrons of

Ga

atoms

3 Greater shielding power of d-electrons of

Ga

atoms

4 Poor shielding power of d-electrons of

Ga

atoms

Explanation:

Due to poor shielding effect of d -electrons in case of $Ga$ , the valence electrons are attracted more strongly and hence the size is not increased.

CHXI11:THE P-BLOCK ELEMENTS

316477 The correct order of atomic radii in group 13 elements is

1

B < Ga < Al < Tl < In

2

B < Ga < Al < In < Tl

3

B < Al < Ga < In < Tl

4

B < Al < In < Ga < Tl

Explanation:

Atomic radius of $Al >$ Atomic radius $Ga$
Expected $B < Al < Ga < In < Tl$
Observed $B < Ga < Al < In < Tl$

NEET - 2018

CHXI11:THE P-BLOCK ELEMENTS

316478 Assertion :
The ionisation energy of gallium remains nearly same as that of aluminium.
Reason :
This is due to shielding of outer shell electrons from the nucleus by the d-electrons of gallium.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

In case of $Ga$ , there are $10 d$ -electrons in the penultimate energy shell which shield the nuclear charge less effectively. The outer electron is held firmly by the nucleus. As a result the ionisation energy remains nearly the same as that of aluminium. So, option (1) is correct.

CHXI11:THE P-BLOCK ELEMENTS

316479 The element whose atomic volume is least is

1 Boron

2 Aluminium

3 Gallium

4 Thallium

CHXI11:THE P-BLOCK ELEMENTS

316480 The correct order of the first ionisation enthalpy is

1

Al > Ga > Tl

2

Tl > Ga > Al

3

Ga > Al > B

4 B

> Al >

Ga

Explanation:

supporting img
The ionisation enthalpy decreases from B to Al due to increase in atomic size. The ionisation energy of Ga is slightly higher than that of Al due to ineffective screening of 3 d -electrons.
In Tl , the nuclear charge increases considerably which outweighs the screening effect of all the electrons of the inner shells. Hence, ionisation enthalpy of Tl is much higher than $Al, Ga$ , In.
So, correct order is $B > Tl > Ga > Al > In$ . So, the correct option is (2)

JEE Main - 2024

CHXI11:THE P-BLOCK ELEMENTS

316476 $Al$ and $Ga$ have same covalent radii because of

1 Greater shielding power of s-electrons of

Ga

atoms

2 Poor shielding power of s-electrons of

Ga

atoms

3 Greater shielding power of d-electrons of

Ga

atoms

4 Poor shielding power of d-electrons of

Ga

atoms

Explanation:

Due to poor shielding effect of d -electrons in case of $Ga$ , the valence electrons are attracted more strongly and hence the size is not increased.

CHXI11:THE P-BLOCK ELEMENTS

316477 The correct order of atomic radii in group 13 elements is

1

B < Ga < Al < Tl < In

2

B < Ga < Al < In < Tl

3

B < Al < Ga < In < Tl

4

B < Al < In < Ga < Tl

Explanation:

Atomic radius of $Al >$ Atomic radius $Ga$
Expected $B < Al < Ga < In < Tl$
Observed $B < Ga < Al < In < Tl$

NEET - 2018

CHXI11:THE P-BLOCK ELEMENTS

316478 Assertion :
The ionisation energy of gallium remains nearly same as that of aluminium.
Reason :
This is due to shielding of outer shell electrons from the nucleus by the d-electrons of gallium.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

In case of $Ga$ , there are $10 d$ -electrons in the penultimate energy shell which shield the nuclear charge less effectively. The outer electron is held firmly by the nucleus. As a result the ionisation energy remains nearly the same as that of aluminium. So, option (1) is correct.

CHXI11:THE P-BLOCK ELEMENTS

316479 The element whose atomic volume is least is

1 Boron

2 Aluminium

3 Gallium

4 Thallium

CHXI11:THE P-BLOCK ELEMENTS

316480 The correct order of the first ionisation enthalpy is

1

Al > Ga > Tl

2

Tl > Ga > Al

3

Ga > Al > B

4 B

> Al >

Ga

Explanation:

supporting img
The ionisation enthalpy decreases from B to Al due to increase in atomic size. The ionisation energy of Ga is slightly higher than that of Al due to ineffective screening of 3 d -electrons.
In Tl , the nuclear charge increases considerably which outweighs the screening effect of all the electrons of the inner shells. Hence, ionisation enthalpy of Tl is much higher than $Al, Ga$ , In.
So, correct order is $B > Tl > Ga > Al > In$ . So, the correct option is (2)

JEE Main - 2024

CHXI11:THE P-BLOCK ELEMENTS

316476 $Al$ and $Ga$ have same covalent radii because of

1 Greater shielding power of s-electrons of

Ga

atoms

2 Poor shielding power of s-electrons of

Ga

atoms

3 Greater shielding power of d-electrons of

Ga

atoms

4 Poor shielding power of d-electrons of

Ga

atoms

Explanation:

Due to poor shielding effect of d -electrons in case of $Ga$ , the valence electrons are attracted more strongly and hence the size is not increased.

CHXI11:THE P-BLOCK ELEMENTS

316477 The correct order of atomic radii in group 13 elements is

1

B < Ga < Al < Tl < In

2

B < Ga < Al < In < Tl

3

B < Al < Ga < In < Tl

4

B < Al < In < Ga < Tl

Explanation:

Atomic radius of $Al >$ Atomic radius $Ga$
Expected $B < Al < Ga < In < Tl$
Observed $B < Ga < Al < In < Tl$

NEET - 2018

CHXI11:THE P-BLOCK ELEMENTS

316478 Assertion :
The ionisation energy of gallium remains nearly same as that of aluminium.
Reason :
This is due to shielding of outer shell electrons from the nucleus by the d-electrons of gallium.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

In case of $Ga$ , there are $10 d$ -electrons in the penultimate energy shell which shield the nuclear charge less effectively. The outer electron is held firmly by the nucleus. As a result the ionisation energy remains nearly the same as that of aluminium. So, option (1) is correct.

CHXI11:THE P-BLOCK ELEMENTS

316479 The element whose atomic volume is least is

1 Boron

2 Aluminium

3 Gallium

4 Thallium

CHXI11:THE P-BLOCK ELEMENTS

316480 The correct order of the first ionisation enthalpy is

1

Al > Ga > Tl

2

Tl > Ga > Al

3

Ga > Al > B

4 B

> Al >

Ga

Explanation:

supporting img
The ionisation enthalpy decreases from B to Al due to increase in atomic size. The ionisation energy of Ga is slightly higher than that of Al due to ineffective screening of 3 d -electrons.
In Tl , the nuclear charge increases considerably which outweighs the screening effect of all the electrons of the inner shells. Hence, ionisation enthalpy of Tl is much higher than $Al, Ga$ , In.
So, correct order is $B > Tl > Ga > Al > In$ . So, the correct option is (2)

JEE Main - 2024

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