A set of ions among the following that have a 3d2 electronic configuration is:
1.
2.
3.
4.
Zn gives H2 gas with H2SO4 and HCl but not with HNO3 because:
1. | Zn acts as an oxidizing agent when it reacts with HNO3 |
2. | HNO3 is weaker acid than H2SO4 and HCl |
3. | In the electrochemical series, Zn is above hydrogen |
4. | NO3Θ is reduced in preference to hydronium ion. |
The basic character of the transition metal monoxides follows the order:
(Atomic nos. Ti = 22, V = 23, Cr = 24, Fe = 26)
1. | VO > CrO > TiO > FeO | 2. | CrO > VO > FeO > TiO |
3. | TiO > FeO > VO > CrO | 4. | TiO > VO > CrO > FeO |
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 these |
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. |
1. | \((n-1) d^{1-10} n s^{0-2} \) | 2. | \((n-1) d^{1-10} n s^2 \) |
3. | \(n f^2~ n p^{1-6} \) | 4. | \(n d^2~ n p^{1-6}\) |
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 |