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. |
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.
The oxo metal anions of the 3d series in which the metal exhibits an oxidation state equal to its group number is /are -
1.
2.
3.
4. All of the above.
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. |
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. |
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
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
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. |
In the 3d series, a metal with a +1 oxidation state is:
1. Mn
2. Cu
3. Fe
4. Zn
The number of unpaired electrons in the gaseous ions 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 |