316476
\(\mathrm{Al}\) and \(\mathrm{Ga}\) have same covalent radii because of
1 Greater shielding power of s-electrons of \(\mathrm{Ga}\) atoms
2 Poor shielding power of s-electrons of \(\mathrm{Ga}\) atoms
3 Greater shielding power of d-electrons of \(\mathrm{Ga}\) atoms
4 Poor shielding power of d-electrons of \(\mathrm{Ga}\) atoms
Explanation:
Due to poor shielding effect of d -electrons in case of \(\mathrm{Ga}\), 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 \({\text{B < Ga < Al < Tl < In}}\)
2 \({\text{B < Ga < Al < In < Tl}}\)
3 \({\text{B < Al < Ga < In < Tl}}\)
4 \({\text{B < Al < In < Ga < Tl}}\)
Explanation:
Atomic radius of \({\text{Al > }}\) Atomic radius \(\mathrm{Ga}\) Expected \({\text{B < Al < Ga < In < Tl}}\) Observed \({\text{B < Ga < Al < In < Tl}}\)
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 \(\mathrm{Ga}\), there are \(10 \mathrm{~d}\)-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
Explanation:
Boron has least atomic volume among group 13 elements.
CHXI11:THE P-BLOCK ELEMENTS
316480
The correct order of the first ionisation enthalpy is
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 \({\mathrm{\mathrm{\mathrm{Al}, \mathrm{Ga}}}}\), In. So, correct order is \({\mathrm{\mathrm{\mathrm{B}>\mathrm{Tl}>\mathrm{Ga}>\mathrm{Al}>\mathrm{In}}}}\). So, the correct option is (2)
316476
\(\mathrm{Al}\) and \(\mathrm{Ga}\) have same covalent radii because of
1 Greater shielding power of s-electrons of \(\mathrm{Ga}\) atoms
2 Poor shielding power of s-electrons of \(\mathrm{Ga}\) atoms
3 Greater shielding power of d-electrons of \(\mathrm{Ga}\) atoms
4 Poor shielding power of d-electrons of \(\mathrm{Ga}\) atoms
Explanation:
Due to poor shielding effect of d -electrons in case of \(\mathrm{Ga}\), 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 \({\text{B < Ga < Al < Tl < In}}\)
2 \({\text{B < Ga < Al < In < Tl}}\)
3 \({\text{B < Al < Ga < In < Tl}}\)
4 \({\text{B < Al < In < Ga < Tl}}\)
Explanation:
Atomic radius of \({\text{Al > }}\) Atomic radius \(\mathrm{Ga}\) Expected \({\text{B < Al < Ga < In < Tl}}\) Observed \({\text{B < Ga < Al < In < Tl}}\)
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 \(\mathrm{Ga}\), there are \(10 \mathrm{~d}\)-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
Explanation:
Boron has least atomic volume among group 13 elements.
CHXI11:THE P-BLOCK ELEMENTS
316480
The correct order of the first ionisation enthalpy is
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 \({\mathrm{\mathrm{\mathrm{Al}, \mathrm{Ga}}}}\), In. So, correct order is \({\mathrm{\mathrm{\mathrm{B}>\mathrm{Tl}>\mathrm{Ga}>\mathrm{Al}>\mathrm{In}}}}\). So, the correct option is (2)
316476
\(\mathrm{Al}\) and \(\mathrm{Ga}\) have same covalent radii because of
1 Greater shielding power of s-electrons of \(\mathrm{Ga}\) atoms
2 Poor shielding power of s-electrons of \(\mathrm{Ga}\) atoms
3 Greater shielding power of d-electrons of \(\mathrm{Ga}\) atoms
4 Poor shielding power of d-electrons of \(\mathrm{Ga}\) atoms
Explanation:
Due to poor shielding effect of d -electrons in case of \(\mathrm{Ga}\), 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 \({\text{B < Ga < Al < Tl < In}}\)
2 \({\text{B < Ga < Al < In < Tl}}\)
3 \({\text{B < Al < Ga < In < Tl}}\)
4 \({\text{B < Al < In < Ga < Tl}}\)
Explanation:
Atomic radius of \({\text{Al > }}\) Atomic radius \(\mathrm{Ga}\) Expected \({\text{B < Al < Ga < In < Tl}}\) Observed \({\text{B < Ga < Al < In < Tl}}\)
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 \(\mathrm{Ga}\), there are \(10 \mathrm{~d}\)-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
Explanation:
Boron has least atomic volume among group 13 elements.
CHXI11:THE P-BLOCK ELEMENTS
316480
The correct order of the first ionisation enthalpy is
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 \({\mathrm{\mathrm{\mathrm{Al}, \mathrm{Ga}}}}\), In. So, correct order is \({\mathrm{\mathrm{\mathrm{B}>\mathrm{Tl}>\mathrm{Ga}>\mathrm{Al}>\mathrm{In}}}}\). So, the correct option is (2)
NEET Test Series from KOTA - 10 Papers In MS WORD
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CHXI11:THE P-BLOCK ELEMENTS
316476
\(\mathrm{Al}\) and \(\mathrm{Ga}\) have same covalent radii because of
1 Greater shielding power of s-electrons of \(\mathrm{Ga}\) atoms
2 Poor shielding power of s-electrons of \(\mathrm{Ga}\) atoms
3 Greater shielding power of d-electrons of \(\mathrm{Ga}\) atoms
4 Poor shielding power of d-electrons of \(\mathrm{Ga}\) atoms
Explanation:
Due to poor shielding effect of d -electrons in case of \(\mathrm{Ga}\), 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 \({\text{B < Ga < Al < Tl < In}}\)
2 \({\text{B < Ga < Al < In < Tl}}\)
3 \({\text{B < Al < Ga < In < Tl}}\)
4 \({\text{B < Al < In < Ga < Tl}}\)
Explanation:
Atomic radius of \({\text{Al > }}\) Atomic radius \(\mathrm{Ga}\) Expected \({\text{B < Al < Ga < In < Tl}}\) Observed \({\text{B < Ga < Al < In < Tl}}\)
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 \(\mathrm{Ga}\), there are \(10 \mathrm{~d}\)-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
Explanation:
Boron has least atomic volume among group 13 elements.
CHXI11:THE P-BLOCK ELEMENTS
316480
The correct order of the first ionisation enthalpy is
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 \({\mathrm{\mathrm{\mathrm{Al}, \mathrm{Ga}}}}\), In. So, correct order is \({\mathrm{\mathrm{\mathrm{B}>\mathrm{Tl}>\mathrm{Ga}>\mathrm{Al}>\mathrm{In}}}}\). So, the correct option is (2)
316476
\(\mathrm{Al}\) and \(\mathrm{Ga}\) have same covalent radii because of
1 Greater shielding power of s-electrons of \(\mathrm{Ga}\) atoms
2 Poor shielding power of s-electrons of \(\mathrm{Ga}\) atoms
3 Greater shielding power of d-electrons of \(\mathrm{Ga}\) atoms
4 Poor shielding power of d-electrons of \(\mathrm{Ga}\) atoms
Explanation:
Due to poor shielding effect of d -electrons in case of \(\mathrm{Ga}\), 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 \({\text{B < Ga < Al < Tl < In}}\)
2 \({\text{B < Ga < Al < In < Tl}}\)
3 \({\text{B < Al < Ga < In < Tl}}\)
4 \({\text{B < Al < In < Ga < Tl}}\)
Explanation:
Atomic radius of \({\text{Al > }}\) Atomic radius \(\mathrm{Ga}\) Expected \({\text{B < Al < Ga < In < Tl}}\) Observed \({\text{B < Ga < Al < In < Tl}}\)
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 \(\mathrm{Ga}\), there are \(10 \mathrm{~d}\)-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
Explanation:
Boron has least atomic volume among group 13 elements.
CHXI11:THE P-BLOCK ELEMENTS
316480
The correct order of the first ionisation enthalpy is
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 \({\mathrm{\mathrm{\mathrm{Al}, \mathrm{Ga}}}}\), In. So, correct order is \({\mathrm{\mathrm{\mathrm{B}>\mathrm{Tl}>\mathrm{Ga}>\mathrm{Al}>\mathrm{In}}}}\). So, the correct option is (2)
