321751
Given below are two statements : Statement (A): In Lanthanoids, the formation \(\mathrm{Ce}^{+4}\) is favoured by its noble gas configuration. Statement (B) : It is a strong oxidant reverting to the common +3 state.
1 Statement A is correct but statement B is incorrect.
2 Statement A is incorrect but statement \(\mathrm{B}\) is correct.
321752
Assertion : \(\mathrm{Yb}^{2+}\) is more stable in compare to \(\mathrm{Gd}^{+2}\). Reason : The electronic configuration of \(\mathrm{Gd}\) is \([\mathrm{Xe}] 4 \mathrm{f}^{7} 5 \mathrm{~d}^{2} 6 \mathrm{~s}^{2}\).
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:
The electronic configuration of \(\begin{aligned}\mathrm{Yb}^{+2} & =[\mathrm{Xe}], 4 \mathrm{f}^{14}, 5 \mathrm{~d}^{0}, 6 \mathrm{~s}^{0} \\\mathrm{Gd}^{+2} & =[\mathrm{Xe}], 4 \mathrm{f}^{7}, 5 \mathrm{~d}^{1} 6 \mathrm{~s}^{0}\end{aligned}\) Since, \(\mathrm{Yb}^{2+}\) has full - filled \(\left(\mathrm{f}^{14}\right)\) configuration. It is more stable than that of \(\mathrm{Gd}^{2+}\). 'Gd' electronic configuration is \((\mathrm{Xe}) 4 \mathrm{f}^{7} 5 \mathrm{~d}^{1} 6 \mathrm{~s}^{2}\)
AIIMS - 2019
CHXII08:THE D- & F-BLOCK ELEMENTS
321753
The most common oxidation states of cerium are
1 +2 and +4
2 +3 and +4
3 +3 and +5
4 +2 and +3
Explanation:
Conceptual Questions
CHXII08:THE D- & F-BLOCK ELEMENTS
321754
In which of the following lanthanoids oxidation state +2 is most stable?
1 \(\mathrm{\mathrm{Ce}}\)
2 \(\mathrm{\mathrm{Eu}}\)
3 \(\mathrm{\mathrm{Tb}}\)
4 Dy
Explanation:
\(\mathrm{E u^{2+}}\) has electronic configuration \(\mathrm{[X e] 4 f^{7}}\) hence stable due to half filled atomic orbitals.
321751
Given below are two statements : Statement (A): In Lanthanoids, the formation \(\mathrm{Ce}^{+4}\) is favoured by its noble gas configuration. Statement (B) : It is a strong oxidant reverting to the common +3 state.
1 Statement A is correct but statement B is incorrect.
2 Statement A is incorrect but statement \(\mathrm{B}\) is correct.
321752
Assertion : \(\mathrm{Yb}^{2+}\) is more stable in compare to \(\mathrm{Gd}^{+2}\). Reason : The electronic configuration of \(\mathrm{Gd}\) is \([\mathrm{Xe}] 4 \mathrm{f}^{7} 5 \mathrm{~d}^{2} 6 \mathrm{~s}^{2}\).
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:
The electronic configuration of \(\begin{aligned}\mathrm{Yb}^{+2} & =[\mathrm{Xe}], 4 \mathrm{f}^{14}, 5 \mathrm{~d}^{0}, 6 \mathrm{~s}^{0} \\\mathrm{Gd}^{+2} & =[\mathrm{Xe}], 4 \mathrm{f}^{7}, 5 \mathrm{~d}^{1} 6 \mathrm{~s}^{0}\end{aligned}\) Since, \(\mathrm{Yb}^{2+}\) has full - filled \(\left(\mathrm{f}^{14}\right)\) configuration. It is more stable than that of \(\mathrm{Gd}^{2+}\). 'Gd' electronic configuration is \((\mathrm{Xe}) 4 \mathrm{f}^{7} 5 \mathrm{~d}^{1} 6 \mathrm{~s}^{2}\)
AIIMS - 2019
CHXII08:THE D- & F-BLOCK ELEMENTS
321753
The most common oxidation states of cerium are
1 +2 and +4
2 +3 and +4
3 +3 and +5
4 +2 and +3
Explanation:
Conceptual Questions
CHXII08:THE D- & F-BLOCK ELEMENTS
321754
In which of the following lanthanoids oxidation state +2 is most stable?
1 \(\mathrm{\mathrm{Ce}}\)
2 \(\mathrm{\mathrm{Eu}}\)
3 \(\mathrm{\mathrm{Tb}}\)
4 Dy
Explanation:
\(\mathrm{E u^{2+}}\) has electronic configuration \(\mathrm{[X e] 4 f^{7}}\) hence stable due to half filled atomic orbitals.
321751
Given below are two statements : Statement (A): In Lanthanoids, the formation \(\mathrm{Ce}^{+4}\) is favoured by its noble gas configuration. Statement (B) : It is a strong oxidant reverting to the common +3 state.
1 Statement A is correct but statement B is incorrect.
2 Statement A is incorrect but statement \(\mathrm{B}\) is correct.
321752
Assertion : \(\mathrm{Yb}^{2+}\) is more stable in compare to \(\mathrm{Gd}^{+2}\). Reason : The electronic configuration of \(\mathrm{Gd}\) is \([\mathrm{Xe}] 4 \mathrm{f}^{7} 5 \mathrm{~d}^{2} 6 \mathrm{~s}^{2}\).
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:
The electronic configuration of \(\begin{aligned}\mathrm{Yb}^{+2} & =[\mathrm{Xe}], 4 \mathrm{f}^{14}, 5 \mathrm{~d}^{0}, 6 \mathrm{~s}^{0} \\\mathrm{Gd}^{+2} & =[\mathrm{Xe}], 4 \mathrm{f}^{7}, 5 \mathrm{~d}^{1} 6 \mathrm{~s}^{0}\end{aligned}\) Since, \(\mathrm{Yb}^{2+}\) has full - filled \(\left(\mathrm{f}^{14}\right)\) configuration. It is more stable than that of \(\mathrm{Gd}^{2+}\). 'Gd' electronic configuration is \((\mathrm{Xe}) 4 \mathrm{f}^{7} 5 \mathrm{~d}^{1} 6 \mathrm{~s}^{2}\)
AIIMS - 2019
CHXII08:THE D- & F-BLOCK ELEMENTS
321753
The most common oxidation states of cerium are
1 +2 and +4
2 +3 and +4
3 +3 and +5
4 +2 and +3
Explanation:
Conceptual Questions
CHXII08:THE D- & F-BLOCK ELEMENTS
321754
In which of the following lanthanoids oxidation state +2 is most stable?
1 \(\mathrm{\mathrm{Ce}}\)
2 \(\mathrm{\mathrm{Eu}}\)
3 \(\mathrm{\mathrm{Tb}}\)
4 Dy
Explanation:
\(\mathrm{E u^{2+}}\) has electronic configuration \(\mathrm{[X e] 4 f^{7}}\) hence stable due to half filled atomic orbitals.
321751
Given below are two statements : Statement (A): In Lanthanoids, the formation \(\mathrm{Ce}^{+4}\) is favoured by its noble gas configuration. Statement (B) : It is a strong oxidant reverting to the common +3 state.
1 Statement A is correct but statement B is incorrect.
2 Statement A is incorrect but statement \(\mathrm{B}\) is correct.
321752
Assertion : \(\mathrm{Yb}^{2+}\) is more stable in compare to \(\mathrm{Gd}^{+2}\). Reason : The electronic configuration of \(\mathrm{Gd}\) is \([\mathrm{Xe}] 4 \mathrm{f}^{7} 5 \mathrm{~d}^{2} 6 \mathrm{~s}^{2}\).
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:
The electronic configuration of \(\begin{aligned}\mathrm{Yb}^{+2} & =[\mathrm{Xe}], 4 \mathrm{f}^{14}, 5 \mathrm{~d}^{0}, 6 \mathrm{~s}^{0} \\\mathrm{Gd}^{+2} & =[\mathrm{Xe}], 4 \mathrm{f}^{7}, 5 \mathrm{~d}^{1} 6 \mathrm{~s}^{0}\end{aligned}\) Since, \(\mathrm{Yb}^{2+}\) has full - filled \(\left(\mathrm{f}^{14}\right)\) configuration. It is more stable than that of \(\mathrm{Gd}^{2+}\). 'Gd' electronic configuration is \((\mathrm{Xe}) 4 \mathrm{f}^{7} 5 \mathrm{~d}^{1} 6 \mathrm{~s}^{2}\)
AIIMS - 2019
CHXII08:THE D- & F-BLOCK ELEMENTS
321753
The most common oxidation states of cerium are
1 +2 and +4
2 +3 and +4
3 +3 and +5
4 +2 and +3
Explanation:
Conceptual Questions
CHXII08:THE D- & F-BLOCK ELEMENTS
321754
In which of the following lanthanoids oxidation state +2 is most stable?
1 \(\mathrm{\mathrm{Ce}}\)
2 \(\mathrm{\mathrm{Eu}}\)
3 \(\mathrm{\mathrm{Tb}}\)
4 Dy
Explanation:
\(\mathrm{E u^{2+}}\) has electronic configuration \(\mathrm{[X e] 4 f^{7}}\) hence stable due to half filled atomic orbitals.
