The irregular variation of ionization enthalpies (first and second) in the first series of the transition elements is due to:
1. The extra stability of configurations such as d5, d10
2. The less stability of configurations such as d5, d10 
3. The extra stability of configurations such as d4, d6
4. The extra stability of configurations such as d7, d8

Subtopic:  d-Block Elements- Properties & Uses |
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Statement 1: Highest oxidation state of a metal is exhibited in its oxide or fluoride only.
Statement 2: Both oxide and fluoride ions are able to oxidise metals.
 
1. Statement 1 is true, Statement 2 is false.
2. Statement 1 is false, Statement 2 is true.
3. Both Statements 1 and Statement 2 are true.
4. Both Statements 1 and Statement 2 are false.
Subtopic:  d-Block Elements- Properties & Uses |
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Statement I: Cr2+ is a stronger reducing agent than Fe2+ .
Statement II: Fe2+ is a stronger reducing agent than Cr2+ .
 
1. Both Statements I and Statement II are true.
2. Statement I is true and Statement II is false.
3. Both Statements I and Statement II are false.
4. Statement I is false, Statement II is true.
Subtopic:  d-Block Elements- Properties & Uses |
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The ‘spin only’ magnetic moment of M2+(aq) ion is : 
(Z for 'M' = 27)

1. 3.87 BM
2. 5.10 BM
3. 1.73 BM
4. 2.45 BM
Subtopic:  d-Block Elements- Properties & Uses |
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 Cu+ ion is not stable in aqueous solutions, because:
1. Hydration energy of Cu+2 is more than the ionisation energy for Cu+
2. Ionisation energy of Cu+ is more the hydration energy of Cu+2
3. Hydration energy of Cu+2  is equal to the ionisation energy of Cu+
4. Both (2) and (3) 
Subtopic:  d-Block Elements- Properties & Uses |
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Statement I: Actinoid contraction is greater from element to element than lanthanoid contraction. 
Statement II:  5f orbitals have a poorer shielding effect than 4f orbitals.
   
1. Statement I is True and Statement II is False.
2. Statement I is False and Statement II is True.
3. Both Statement I and Statement II are False.
4. Both Statement I and Statement II are True.
Subtopic:  Lanthanoid & Actinoids Contraction |
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The E0(M2+/M) value for copper is positive (+0.34V) due to:
1. High energy of atomization and low hydration energy
2. Low energy of atomization and low hydration energy
3. High energy of atomization and high hydration energy
4. low energy of atomization and high hydration energy
Subtopic:  d-Block Elements- Properties & Uses |
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The transition metal that exhibits the largest number of oxidation states among the following is:
1. Cr 2. Mn
3. Zn 4. Sc
Subtopic:  d-Block Elements- Properties & Uses |
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The enthalpy of atomization of zinc is the lowest among the 3d series, because-
1. It has weak coordinate bond
2. It has strong metallic bonding
3. It has strong ionic bonding
4. It has weak metallic bonding
Subtopic:  d-Block Elements- Properties & Uses |
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Statement I: Silver atom has completely filled d orbitals (4d10) in its ground state.
Statement II: Silver is not a transition element.
 
1. Statement I is True , Statement II is False.
2. Statement I is False, Statement II  is True.
3. Both Statement I and Statement II are True.
4. Both Statement I and Statement II are False.
Subtopic:  d-Block Elements- Properties & Uses |
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