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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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