The different oxidation states exhibited by the lanthanoids are

1. +2, -3, +4

2. -2, -3, -4

3. +2, +3, -4

4. +2, +3, +4

Subtopic:  f-Block Elements- Properties & Uses |
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The "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.
Subtopic:  d-Block Elements- Properties & Uses |
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In the 3d series, a metal with a +1 oxidation state is:

1. Mn

2. Cu

3. Fe

4. Zn

Subtopic:  d-Block Elements- Properties & Uses |
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The number of unpaired electrons in the gaseous ions Mn3+, Cr3+, V3+, and Ti3 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

Subtopic:  d-Block Elements- Properties & Uses |
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Alloy that contains lanthanoid metals is-

1. Mischmetal

2. Permalloy

3. Supermalloy

4. Brass

Subtopic:  f-Block Elements- Properties & Uses |
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Give below are some atomic numbers:

29, 59, 74, 95, 102, 104

The atomic numbers of the inner transition elements among the above are :

1. 29, 59, 74

2. 59, 95, 102

3. 95, 102, 104

4. 59, 74, 95

Subtopic:  f-Block Elements- Properties & Uses |
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The electronic configuration of the last element of actinoids is

1. Thorium, Th: Rn5f146d17s2

2. Lawrencium, Lr: Rn5f146d17s2

3. Neptunium, Np: Rn5f146d17s2

4. Protactinium, Pa: Rn5f146d17s2

Subtopic:  f-Block Elements- Properties & Uses |
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The number of 3d electrons in each of the Cr3+ ions will be:

1.  5

2.  6

3.  3

4.  7

Subtopic:  d-Block Elements- Properties & Uses |
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The correct statement regarding Ag is 

1. It is a hard metal.
2. It is not a transition element.
3. It has a partially filled d orbital in a +2 oxidation state. Thus, it is a transition element.
4. None of the above

Subtopic:  d-Block Elements- Properties & Uses |
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The enthalpy of atomization of transition metals is high due to

1. High effective nuclear charge

2. A large number of valence electrons

3. Very strong metallic bonds

4. All of the above

Subtopic:  d-Block Elements- Properties & Uses |
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