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 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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The transition metals generally form coloured compounds due to :

1. Absorption of radiation to promote an electron .
2. Presence of ligands, the d-orbitals split up into two sets of orbitals.
3. Energy required to promote an electron in d subshell is low.
4. All of the above.

Subtopic:  d-Block Elements- Properties & Uses |
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Match the following : 

Elements Electronic configuration
i. 61 a. [Rn]5f136d0 7s 2
ii. 91 b. [Xe]4f56s2
iii. 101 c. [Rn]5f146d77s2
iv. 109 d. [Rn] 5f2 6d17s2
 
i ii iii iv
1. b d a c
2. c a d b
3. c d a b
4. a c b d

Subtopic:  d-Block Elements- Properties & Uses |
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Transition metals and their many compounds act as good catalysts due to :

1. Variable oxidation states 2. Unstable intermediate
3. Provide a suitable surface 4. All of the above
Subtopic:  d-Block Elements- Properties & Uses |
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