Q. No.The correct electronic configuration and spin only magnetic moment (BM) of Gd3+ (Z = 64), respectively, are:
1. [Xe]5f7 and 8.9
2. [Xe]4f7 and 7.9
3. [Xe]5f7 and 7.9
4. [Xe]4f7 and 8.9
Subtopic: f-Block Elements- Properties & Uses |
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Subtopic: f-Block Elements- Properties & Uses |
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Which of the following lanthanide have half-filled and fully filled f-orbital respectively?
1. Eu2+, Tb3+
2. Yb3+, Tb2+
3. Gd3+, Yb2+
4. Sm2+, Dy2+
1. Eu2+, Tb3+
2. Yb3+, Tb2+
3. Gd3+, Yb2+
4. Sm2+, Dy2+
Subtopic: f-Block Elements- Properties & Uses |
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Which of the following f-block metals have a half-filled f-subshell?
(a) Samarium (Sm)
(b) Gadolinium (Gd)
(c) Europium (Eu)
(d) Terbium (Tb)
[Atomic numbers : Sm = 62, Eu = 63, Gd = 64, Tb = 65]
1. (a) and (b)
2. (b) and (c)
3. (c) and (d)
4. (a) and (c)
(a) Samarium (Sm)
(b) Gadolinium (Gd)
(c) Europium (Eu)
(d) Terbium (Tb)
[Atomic numbers : Sm = 62, Eu = 63, Gd = 64, Tb = 65]
1. (a) and (b)
2. (b) and (c)
3. (c) and (d)
4. (a) and (c)
Subtopic: f-Block Elements- Properties & Uses |
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How many of the following elements do not belong to the Lanthanoids?
\(\mathrm{Eu}, \mathrm{Er}, \mathrm{Lu}, \mathrm{Cm}, \mathrm{Yb}, \mathrm{Tb}\)
1. 5
2. 4
3. 3
4. 1
\(\mathrm{Eu}, \mathrm{Er}, \mathrm{Lu}, \mathrm{Cm}, \mathrm{Yb}, \mathrm{Tb}\)
1. 5
2. 4
3. 3
4. 1
Subtopic: f-Block Elements- Properties & Uses |
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The most common oxidation state of Lanthanoid elements is \(+3.\) Which of the following is likely to deviate easily from \(+3\) oxidation state?
1. \(\text{Ce}\)(At. No. 58)
2. \(\text{La}\)(At. No. 57)
3. \(\text{Lu}\)(At. No. 71)
4. \(\text{Gd}\)(At. No. 64)
1. \(\text{Ce}\)(At. No. 58)
2. \(\text{La}\)(At. No. 57)
3. \(\text{Lu}\)(At. No. 71)
4. \(\text{Gd}\)(At. No. 64)
Subtopic: f-Block Elements- Properties & Uses |
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Which of the following pairs of ions of lanthanoids corresponds to half-filled and completely filled 'f' orbitals respectively, based on their electronic configurations? [Given: Atomic no. \(\mathrm{Eu, 63; Sm, 62; Tm, 69; Tb, 65; Yb, 70; Dy, 66]}\)
1. \(\mathrm{Eu^{2+}}\) and \(\mathrm{Tm^{2+}}\)
2. \(\mathrm{Sm^{2+}}\)and \(\mathrm{Tm^{3+}}\)
3. \(\mathrm{Tb^{4+}}\) and \(\mathrm{Yb^{2+}}\)
4. \(\mathrm{Dy^{3+}}\) and \(\mathrm{Yb^{3+}}\)
1. \(\mathrm{Eu^{2+}}\) and \(\mathrm{Tm^{2+}}\)
2. \(\mathrm{Sm^{2+}}\)and \(\mathrm{Tm^{3+}}\)
3. \(\mathrm{Tb^{4+}}\) and \(\mathrm{Yb^{2+}}\)
4. \(\mathrm{Dy^{3+}}\) and \(\mathrm{Yb^{3+}}\)
Subtopic: f-Block Elements- Properties & Uses |
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How many \(f\) electrons are present in the ground-state electronic configuration of Np (Z = 93)?
| 1. | 18 | 2. | 14 |
| 3. | 4 | 4. | 21 |
Subtopic: f-Block Elements- Properties & Uses |
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Which of the following f-block elements is most stable in the bivalent oxidation state?
1. Sm
2. Eu
3. Tb
4. Ce
1. Sm
2. Eu
3. Tb
4. Ce
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A larger number of oxidation states are exhibited by the actinoids than by the lanthanoids, the main reason being:
1. More reactive nature of the actinoids than the lanthanoids
2. More energy difference between 5f and 6d than between 4f and 5d orbitals
3. Lesser energy difference between 5f and 6d than between 4f and 5d orbitals
4. 4f orbitals more diffuse than the 5f orbitals
Subtopic: f-Block Elements- Properties & Uses |
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