321588
Assertion : Separation of \(\mathrm{Zr}\) and \(\mathrm{Hf}\) is difficult. Reason : \(\mathrm{Zr}\) and \(\mathrm{Hf}\) lie in the same group of the periodic table.
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 Both Assertion and Reason is incorrect.
Explanation:
Separation of \(\mathrm{Zr}\) and \(\mathrm{Hf}\) is difficult, it is not because of they lie in the same group of the periodic table. This is due to the lanthanide contraction which causes almost similar radii of both of them.
AIIMS - 2017
CHXII08:THE D- & F-BLOCK ELEMENTS
321589
Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionisation enthalpy?
1 Vanadium \(\mathrm{(Z=23)}\)
2 \(\mathrm{\operatorname{Chromium}(Z=24)}\)
3 Manganese \(\mathrm{(Z=25)}\)
4 Iron \(\mathrm{(Z=26)}\)
Explanation:
\(\mathrm{M n^{+2}}\) has \(\mathrm{d^{5}}\) configuration.
CHXII08:THE D- & F-BLOCK ELEMENTS
321590
Assertion : Members of 4d and 5d series of transition elements have nearly same atomic radii. Reason : Atomic and ionic radii for transition elements are smaller than their corresponding s-block elements.
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:
Members of \({\text{4d}}\) and \({\text{5d}}\) series of transition elements have nearly same atomic radii due to lanthanide contraction. This results from ineffective electron shielding by the ' \(\mathrm{f}\) ' orbitals. Atomic and ionic radii decrease accross a period. So option (2) is correct.
CHXII08:THE D- & F-BLOCK ELEMENTS
321591
Which of the following statement (s) is/are incorrect for pair of elements \(\mathrm{\mathrm{Zr}}\)-Hf ?
1 Both possess same number of valence electrons
2 Both have identical size
3 Both have almost identical radii
4 Both of these belong to same period of periodic table
Explanation:
Zirconium \(\mathrm{(\mathrm{Zr})}\) with atomic number is 40 and Hafnium (Hf) with atomic number is 72 belongs of period 5th and 6th respectively.
321588
Assertion : Separation of \(\mathrm{Zr}\) and \(\mathrm{Hf}\) is difficult. Reason : \(\mathrm{Zr}\) and \(\mathrm{Hf}\) lie in the same group of the periodic table.
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 Both Assertion and Reason is incorrect.
Explanation:
Separation of \(\mathrm{Zr}\) and \(\mathrm{Hf}\) is difficult, it is not because of they lie in the same group of the periodic table. This is due to the lanthanide contraction which causes almost similar radii of both of them.
AIIMS - 2017
CHXII08:THE D- & F-BLOCK ELEMENTS
321589
Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionisation enthalpy?
1 Vanadium \(\mathrm{(Z=23)}\)
2 \(\mathrm{\operatorname{Chromium}(Z=24)}\)
3 Manganese \(\mathrm{(Z=25)}\)
4 Iron \(\mathrm{(Z=26)}\)
Explanation:
\(\mathrm{M n^{+2}}\) has \(\mathrm{d^{5}}\) configuration.
CHXII08:THE D- & F-BLOCK ELEMENTS
321590
Assertion : Members of 4d and 5d series of transition elements have nearly same atomic radii. Reason : Atomic and ionic radii for transition elements are smaller than their corresponding s-block elements.
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:
Members of \({\text{4d}}\) and \({\text{5d}}\) series of transition elements have nearly same atomic radii due to lanthanide contraction. This results from ineffective electron shielding by the ' \(\mathrm{f}\) ' orbitals. Atomic and ionic radii decrease accross a period. So option (2) is correct.
CHXII08:THE D- & F-BLOCK ELEMENTS
321591
Which of the following statement (s) is/are incorrect for pair of elements \(\mathrm{\mathrm{Zr}}\)-Hf ?
1 Both possess same number of valence electrons
2 Both have identical size
3 Both have almost identical radii
4 Both of these belong to same period of periodic table
Explanation:
Zirconium \(\mathrm{(\mathrm{Zr})}\) with atomic number is 40 and Hafnium (Hf) with atomic number is 72 belongs of period 5th and 6th respectively.
321588
Assertion : Separation of \(\mathrm{Zr}\) and \(\mathrm{Hf}\) is difficult. Reason : \(\mathrm{Zr}\) and \(\mathrm{Hf}\) lie in the same group of the periodic table.
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 Both Assertion and Reason is incorrect.
Explanation:
Separation of \(\mathrm{Zr}\) and \(\mathrm{Hf}\) is difficult, it is not because of they lie in the same group of the periodic table. This is due to the lanthanide contraction which causes almost similar radii of both of them.
AIIMS - 2017
CHXII08:THE D- & F-BLOCK ELEMENTS
321589
Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionisation enthalpy?
1 Vanadium \(\mathrm{(Z=23)}\)
2 \(\mathrm{\operatorname{Chromium}(Z=24)}\)
3 Manganese \(\mathrm{(Z=25)}\)
4 Iron \(\mathrm{(Z=26)}\)
Explanation:
\(\mathrm{M n^{+2}}\) has \(\mathrm{d^{5}}\) configuration.
CHXII08:THE D- & F-BLOCK ELEMENTS
321590
Assertion : Members of 4d and 5d series of transition elements have nearly same atomic radii. Reason : Atomic and ionic radii for transition elements are smaller than their corresponding s-block elements.
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:
Members of \({\text{4d}}\) and \({\text{5d}}\) series of transition elements have nearly same atomic radii due to lanthanide contraction. This results from ineffective electron shielding by the ' \(\mathrm{f}\) ' orbitals. Atomic and ionic radii decrease accross a period. So option (2) is correct.
CHXII08:THE D- & F-BLOCK ELEMENTS
321591
Which of the following statement (s) is/are incorrect for pair of elements \(\mathrm{\mathrm{Zr}}\)-Hf ?
1 Both possess same number of valence electrons
2 Both have identical size
3 Both have almost identical radii
4 Both of these belong to same period of periodic table
Explanation:
Zirconium \(\mathrm{(\mathrm{Zr})}\) with atomic number is 40 and Hafnium (Hf) with atomic number is 72 belongs of period 5th and 6th respectively.
321588
Assertion : Separation of \(\mathrm{Zr}\) and \(\mathrm{Hf}\) is difficult. Reason : \(\mathrm{Zr}\) and \(\mathrm{Hf}\) lie in the same group of the periodic table.
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 Both Assertion and Reason is incorrect.
Explanation:
Separation of \(\mathrm{Zr}\) and \(\mathrm{Hf}\) is difficult, it is not because of they lie in the same group of the periodic table. This is due to the lanthanide contraction which causes almost similar radii of both of them.
AIIMS - 2017
CHXII08:THE D- & F-BLOCK ELEMENTS
321589
Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionisation enthalpy?
1 Vanadium \(\mathrm{(Z=23)}\)
2 \(\mathrm{\operatorname{Chromium}(Z=24)}\)
3 Manganese \(\mathrm{(Z=25)}\)
4 Iron \(\mathrm{(Z=26)}\)
Explanation:
\(\mathrm{M n^{+2}}\) has \(\mathrm{d^{5}}\) configuration.
CHXII08:THE D- & F-BLOCK ELEMENTS
321590
Assertion : Members of 4d and 5d series of transition elements have nearly same atomic radii. Reason : Atomic and ionic radii for transition elements are smaller than their corresponding s-block elements.
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:
Members of \({\text{4d}}\) and \({\text{5d}}\) series of transition elements have nearly same atomic radii due to lanthanide contraction. This results from ineffective electron shielding by the ' \(\mathrm{f}\) ' orbitals. Atomic and ionic radii decrease accross a period. So option (2) is correct.
CHXII08:THE D- & F-BLOCK ELEMENTS
321591
Which of the following statement (s) is/are incorrect for pair of elements \(\mathrm{\mathrm{Zr}}\)-Hf ?
1 Both possess same number of valence electrons
2 Both have identical size
3 Both have almost identical radii
4 Both of these belong to same period of periodic table
Explanation:
Zirconium \(\mathrm{(\mathrm{Zr})}\) with atomic number is 40 and Hafnium (Hf) with atomic number is 72 belongs of period 5th and 6th respectively.
