Mn2+ compounds are more stable than Fe2+ compounds towards oxidation in their +3 state because

1. 3d5 configuration is more stable than 3d6 configuration.

2. 3d6 configuration is more stable than 3d5 configuration.

3. 3p5 configuration is less stable than 3p6 configuration.

4. 3p6 configuration is less stable than 3p5 configuration.

Subtopic:  d-Block Elements- Properties & Uses |
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The +2 oxidation state becomes more stable in the first half of the first-row transition elements with increasing atomic number because:

1. s-orbital is becoming more and more half-filled.

2. f-orbital is becoming more and more half-filled.

3. d-orbital is becoming more and more half-filled.

4. p-orbital is becoming more and more half-filled.

Subtopic:  d-Block Elements- Properties & Uses |
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The oxo metal anions of the 3d series in which the metal exhibits an oxidation state equal to its group number is /are -

1. VO3-

2. CrO42-

3. MnO4-

4. All of the above.

Subtopic:  d-Block Elements- Properties & Uses |
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The consequence(s) of lanthanoid contraction is/are :  

1. Similarity in the properties of second and third transition series.
2. Separation of lanthanoids is difficult.
3. Variation in the basic strength of lanthanide hydroxides.
4. All of the above.

Subtopic:  Lanthanoid & Actinoids Contraction |
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The d-block elements that may not be regarded as transition elements are

1. Mn, Fe, Ni because these have partially filled d-subshell.
2. Mn, Fe, Ni because these have completely filled d-subshell.
3. Zn, Cd, and Hg because these have completely filled d-subshell.
4. Zn, Cd, and Hg because these have partially filled d-subshell.
Subtopic:  d-Block Elements- Properties & Uses |
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What is the electronic configuration of transition elements?

1. (n − 1)d1-10 ns0-2 

2. (n − 1)d1-10 ns2

3. nf2 np1-6

4. nd2 np1-6

Subtopic:  d-Block Elements- Properties & Uses |
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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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