321734
Which among the following properties of lanthanoids is \(\underline {{\text{NOT}}} \) true?
1 These are good conductors of heat and electricity
2 These are strongly paramagnetic
3 These all are non - radioactive
4 These have coordination number greater than 6 .
Explanation:
Except promethium (Pm), all are non-radioactive in nature.
MHTCET - 2021
CHXII08:THE D- & F-BLOCK ELEMENTS
321735
Which of the following statements is wrong regarding lanthanoids?
1 \({\rm{Ln}}\,\,{\rm{(III)}}\) compounds are predominantly ionic in character.
2 \({\rm{Ln (III)}}\) hydroxides are mainly basic in nature.
3 The ionic size of \({\rm{Ln (III)}}\) ions decreases with increasing atomic number.
4 \({\rm{Ln (III)}}\) compounds are generally colourless.
Explanation:
Many of the trivalent ions of lanthanoids are coloured both in the solid state as well as in solution as they contain unpaired electrons in \(\mathrm{4 \mathrm{f}}\) and \(\mathrm{5 \mathrm{~d}}\) subshells.. The colour of lanthanoid ions arises due to absorption of light from visible region of spectrum resulting in \(\mathrm{\mathrm{f}}\) - \(\mathrm{\mathrm{f}}\) transition as lanthanoids have partly filled f- orbitals.
Due to lanthanoid contraction, the basic character of hydroxides decreases from \(\mathrm{\mathrm{La}^{3+}}\) to \(\mathrm{\mathrm{Lu}^{3+}}\). As a result, covalent nature of \(\mathrm{\mathrm{Ln}-\mathrm{OH}}\) bond also increases. Thus, the most basic hydroxide among the given option is \(\mathrm{\mathrm{La}(\mathrm{OH})_{3}}\).
MHTCET - 2018
CHXII08:THE D- & F-BLOCK ELEMENTS
321737
Which of the following ion is paramagnetic?
NEET Test Series from KOTA - 10 Papers In MS WORD
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CHXII08:THE D- & F-BLOCK ELEMENTS
321734
Which among the following properties of lanthanoids is \(\underline {{\text{NOT}}} \) true?
1 These are good conductors of heat and electricity
2 These are strongly paramagnetic
3 These all are non - radioactive
4 These have coordination number greater than 6 .
Explanation:
Except promethium (Pm), all are non-radioactive in nature.
MHTCET - 2021
CHXII08:THE D- & F-BLOCK ELEMENTS
321735
Which of the following statements is wrong regarding lanthanoids?
1 \({\rm{Ln}}\,\,{\rm{(III)}}\) compounds are predominantly ionic in character.
2 \({\rm{Ln (III)}}\) hydroxides are mainly basic in nature.
3 The ionic size of \({\rm{Ln (III)}}\) ions decreases with increasing atomic number.
4 \({\rm{Ln (III)}}\) compounds are generally colourless.
Explanation:
Many of the trivalent ions of lanthanoids are coloured both in the solid state as well as in solution as they contain unpaired electrons in \(\mathrm{4 \mathrm{f}}\) and \(\mathrm{5 \mathrm{~d}}\) subshells.. The colour of lanthanoid ions arises due to absorption of light from visible region of spectrum resulting in \(\mathrm{\mathrm{f}}\) - \(\mathrm{\mathrm{f}}\) transition as lanthanoids have partly filled f- orbitals.
Due to lanthanoid contraction, the basic character of hydroxides decreases from \(\mathrm{\mathrm{La}^{3+}}\) to \(\mathrm{\mathrm{Lu}^{3+}}\). As a result, covalent nature of \(\mathrm{\mathrm{Ln}-\mathrm{OH}}\) bond also increases. Thus, the most basic hydroxide among the given option is \(\mathrm{\mathrm{La}(\mathrm{OH})_{3}}\).
MHTCET - 2018
CHXII08:THE D- & F-BLOCK ELEMENTS
321737
Which of the following ion is paramagnetic?
321734
Which among the following properties of lanthanoids is \(\underline {{\text{NOT}}} \) true?
1 These are good conductors of heat and electricity
2 These are strongly paramagnetic
3 These all are non - radioactive
4 These have coordination number greater than 6 .
Explanation:
Except promethium (Pm), all are non-radioactive in nature.
MHTCET - 2021
CHXII08:THE D- & F-BLOCK ELEMENTS
321735
Which of the following statements is wrong regarding lanthanoids?
1 \({\rm{Ln}}\,\,{\rm{(III)}}\) compounds are predominantly ionic in character.
2 \({\rm{Ln (III)}}\) hydroxides are mainly basic in nature.
3 The ionic size of \({\rm{Ln (III)}}\) ions decreases with increasing atomic number.
4 \({\rm{Ln (III)}}\) compounds are generally colourless.
Explanation:
Many of the trivalent ions of lanthanoids are coloured both in the solid state as well as in solution as they contain unpaired electrons in \(\mathrm{4 \mathrm{f}}\) and \(\mathrm{5 \mathrm{~d}}\) subshells.. The colour of lanthanoid ions arises due to absorption of light from visible region of spectrum resulting in \(\mathrm{\mathrm{f}}\) - \(\mathrm{\mathrm{f}}\) transition as lanthanoids have partly filled f- orbitals.
Due to lanthanoid contraction, the basic character of hydroxides decreases from \(\mathrm{\mathrm{La}^{3+}}\) to \(\mathrm{\mathrm{Lu}^{3+}}\). As a result, covalent nature of \(\mathrm{\mathrm{Ln}-\mathrm{OH}}\) bond also increases. Thus, the most basic hydroxide among the given option is \(\mathrm{\mathrm{La}(\mathrm{OH})_{3}}\).
MHTCET - 2018
CHXII08:THE D- & F-BLOCK ELEMENTS
321737
Which of the following ion is paramagnetic?
321734
Which among the following properties of lanthanoids is \(\underline {{\text{NOT}}} \) true?
1 These are good conductors of heat and electricity
2 These are strongly paramagnetic
3 These all are non - radioactive
4 These have coordination number greater than 6 .
Explanation:
Except promethium (Pm), all are non-radioactive in nature.
MHTCET - 2021
CHXII08:THE D- & F-BLOCK ELEMENTS
321735
Which of the following statements is wrong regarding lanthanoids?
1 \({\rm{Ln}}\,\,{\rm{(III)}}\) compounds are predominantly ionic in character.
2 \({\rm{Ln (III)}}\) hydroxides are mainly basic in nature.
3 The ionic size of \({\rm{Ln (III)}}\) ions decreases with increasing atomic number.
4 \({\rm{Ln (III)}}\) compounds are generally colourless.
Explanation:
Many of the trivalent ions of lanthanoids are coloured both in the solid state as well as in solution as they contain unpaired electrons in \(\mathrm{4 \mathrm{f}}\) and \(\mathrm{5 \mathrm{~d}}\) subshells.. The colour of lanthanoid ions arises due to absorption of light from visible region of spectrum resulting in \(\mathrm{\mathrm{f}}\) - \(\mathrm{\mathrm{f}}\) transition as lanthanoids have partly filled f- orbitals.
Due to lanthanoid contraction, the basic character of hydroxides decreases from \(\mathrm{\mathrm{La}^{3+}}\) to \(\mathrm{\mathrm{Lu}^{3+}}\). As a result, covalent nature of \(\mathrm{\mathrm{Ln}-\mathrm{OH}}\) bond also increases. Thus, the most basic hydroxide among the given option is \(\mathrm{\mathrm{La}(\mathrm{OH})_{3}}\).
MHTCET - 2018
CHXII08:THE D- & F-BLOCK ELEMENTS
321737
Which of the following ion is paramagnetic?
