The E° value for the Mn3+/Mn2+ couple is more positive than that of Cr3+/Cr2+ or Fe3+/Fe2+ due to change of: 

1. d5 to dconfiguration
2. d4 to dconfiguration
3. dto dconfiguration
4. d5 to dconfiguration
Subtopic:  d-Block Elements- Properties & Uses |
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'Spin only' magnetic moment is same for which of the following ions?
A. Ti3+
B. Cr2+
C. Mn2+
D. Fe2+
E. Sc3+

Choose the most appropriate answer from the options given below:

1. A and E only
2. B and C only
3. A and D only
4. B and D only
Subtopic:  d-Block Elements- Properties & Uses |
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The pair of lanthanoid ions which are diamagnetic is
1. Ce3+ and Eu2+
2. Gd3+ and Eu3+
3. Pm3+ and Sm3+
4. Ce4+ and Yb2+
Subtopic:  f-Block Elements- Properties & Uses |
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The behaviour of samarium (Z=62) is very much like europium (Z=63). Since both elements:
1. exhibit +2 and +3 oxidation states.
2. have \(4 f^5 6 s^2 \) and \(4 f^6 6 s^2\) electronic configurations, respectively.
3. have \(4 f^7 6 s^2\) and \(4 f^8 6 s^2\) electronic configurations, respectively.
4. have same atomic radii.
Subtopic:  f-Block Elements- Properties & Uses |
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Match List-I with List-II 
List-I
(Element)
List-II
(Most Common oxidation state/s)
A.  \(\mathrm{Fe}\) I.  +2, +7 
B.  V II. +3, +2 
C.  \(\mathrm{Mn}\) III. +4
D.  \(\mathrm{Ti}\) IV.  +5
Choose the correct answer from the options given below:

1. A-II, B-IV, C-I, D-III
2. A-IV, B-II, C-I, D-III
3. A-II, B-I, C-IV, D-III
4. A-I, B-IV, C-II, D-III
Subtopic:  d-Block Elements- Properties & Uses |
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Number of moles of \(\text{MnO}_4^-\) getting reduced to \(\text{Mn}^{2+}\) under acidic condition by \(4.517\times10^{24}\) electrons is:

1. 1.5 moles
2. 7.5 moles
3. 2.5 moles
4. 5.0 moles
Subtopic:  Chemistry of Mn and Cr Compounds |
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Which of the following pairs of ions will have the same spin only magnetic moment values within the pair?
A. \(\mathrm{Zn ^{2+}, Ti ^{2+}}\)
B. \(\mathrm{Cr ^{2+}, Fe ^{2+}}\)
C. \(\mathrm{Ti ^{3+}, Cu ^{2+}}\)
D. \(\mathrm{V ^{2+}, Cu ^{+}}\)
Choose the correct answer from the options given below:
1. C and D only 
2. A and D only 
3. A and B only 
4. B and C only 
Subtopic:  d-Block Elements- Properties & Uses |
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Which of the following set of ions act as oxidizing agents?

1. \(\mathrm{Ce}^{4+} \) and \(\mathrm{Tb}^{4+}\)
2. \(\mathrm{La}^{3+} \) and \(\mathrm{Lu}^{3+}\)
3. \(\mathrm{Eu}^{2+} \) and \(\mathrm{Yb}^{2+}\)
4. \(\mathrm{Eu}^{2+} \) and \(\mathrm{Tb}^{4+}\)
Subtopic:  d-Block Elements- Properties & Uses |
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The UV-visible absorption bands in the spectra of lanthanoid ions are 'X', probably because of the excitation of electrons involving 'Y'. The 'X' and 'Y', respectively, are:

1. Broad and f orbitals
2. Narrow and f orbitals
3. Broad and d and f orbitals
4. Narrow and d and f orbitals
Subtopic:  f-Block Elements- Properties & Uses |
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The stability of Cu2+ is greater than that of Cu+ salts in an aqueous solution due to:

1. Second ionisation enthalpy 
2. First ionisation enthalpy 
3. Enthalpy of atomization 
4. Hydration energy 
Subtopic:  d-Block Elements- Properties & Uses |
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NEET - 2023
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