The transition element that does not exhibit variable oxidation states is-

1. Mn
2. Cr
3. Sc
4. Fe
 

Subtopic:  d-Block Elements- Properties & Uses |
 91%
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Given below are two statements: 

Assertion (A): Cr2+ acts as a reducing agent and Mn3+ acts as an oxidising agent when both have d4 configuration.
Reason (R): The maximum oxidation state Cr show is +5 and Mn shows is +7.


 

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.

Subtopic:  d-Block Elements- Properties & Uses |
 58%
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The correct sequence of decreasing oxidizing power of VO2+, MnO4 , Cr2O72–  is -
1. VO2+ > MnO4 > Cr2O72–
2. MnO4 > Cr2O72– > VO2+
3. MnO4 < Cr2O72– < VO2+ 
4.
Cr2O72– > VO2+MnO4

Subtopic:  d-Block Elements- Properties & Uses |
 78%
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The magnetic moment of a divalent ion (atomic number= 25) in aqueous solution is-

1. 4.34
2. 5.92
3. 6.12
4. 4.87
 

Subtopic:  d-Block Elements- Properties & Uses |
 89%
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The example of disproportation reaction among the following is-
1. 3\(MnO_{4}^{2-}\)+ 4 H+ → 2\(MnO_{4}^{-}\) + MnO2 + 2H2O
2. Na2Cr2O7 + 2 KCl → K2Cr2O7 + 2 NaCl
3. PCl5 + H2O → POCl3 +  2HCl
4. 2MnO2 + 4KOH + O2 → 2K2MnO4 + 2H2O

Subtopic:  d-Block Elements- Properties & Uses |
 83%
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The well known element of lanthanoid series that exhibit +4 oxidation state, is-

1. Ac
2. Ce
3. Eu
4. Yb

Subtopic:  f-Block Elements- Properties & Uses |
 81%
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The transition elements exhibit higher enthalpies of atomisation because-

1. It has stronger interatomic interaction
2. It has stronger hydrogen bonding
3. It has paired electrons
4. It has strong vanderwaal interaction

Subtopic:  d-Block Elements- Properties & Uses |
 80%
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Scandium (Z = 21) is a transition element but zinc (Z = 30) is not because-

1.  Sc has 3d0 and Zn has 3d10 
2. Sc has 3d1 and Zn has 3d10 
3. Sc has 3d10 and Zn has 3d1  
4. None of the above

Subtopic:  d-Block Elements- Properties & Uses |
 88%
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