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Q. No.The +2 oxidation state becomes more stable in the first half of the first-row transition elements with increasing atomic number because:
1. s-orbital is becoming more and more half-filled.
2. f-orbital is becoming more and more half-filled.
3. d-orbital is becoming more and more half-filled.
4. p-orbital is becoming more and more half-filled.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe oxo metal anions of the 3d series in which the metal exhibits an oxidation state equal to its group number is /are -
1.
2.
3.
4. All of the above.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe consequence(s) of lanthanoid contraction is/are :
| 1. | Similarity in the properties of second and third transition series. |
| 2. | Separation of lanthanoids is difficult. |
| 3. | Variation in the basic strength of lanthanide hydroxides. |
| 4. | All of the above. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe d-block elements that may not be regarded as transition elements are
| 1. | Mn, Fe, Ni because these have partially filled d-subshell. |
| 2. | Mn, Fe, Ni because these have completely filled d-subshell. |
| 3. | Zn, Cd, and Hg because these have completely filled d-subshell. |
| 4. | Zn, Cd, and Hg because these have partially filled d-subshell. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhat is the electronic configuration of transition elements?
1. (n − 1)d1-10 ns0-2
2. (n − 1)d1-10 ns2
3. nf2 np1-6
4. nd2 np1-6
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe different oxidation states exhibited by the lanthanoids are
1. +2, -3, +4
2. -2, -3, -4
3. +2, +3, -4
4. +2, +3, +4
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe "Disproportionation" reaction means that
| 1. | A relatively less stable oxidation state undergoes an oxidation−reduction reaction. |
| 2. | A relatively more stable oxidation state undergoes an oxidation−reduction reaction. |
| 3. | A relatively less stable oxidation state undergoes a hydrogenation reaction. |
| 4. | A relatively more stable oxidation state undergoes a hydrogenation reaction. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn the 3d series, a metal with a +1 oxidation state is:
1. Mn
2. Cu
3. Fe
4. Zn
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe number of unpaired electrons in the gaseous ions are, respectively:
1. 3, 2, 3, and 1
2. 2, 2, 3, and 1
3. 4, 3, 2, and 1
4. 1, 2, 3, and 4
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAlloy that contains lanthanoid metals is-
1. Mischmetal
2. Permalloy
3. Supermalloy
4. Brass
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