1. | 4f orbitals are penultimate |
2. | 4f orbitals have a greater shielding effect |
3. | 5f orbitals have a poor shielding effect |
4. | 5f orbitals have a greater shielding effect |
I: | Cr2+ is oxidising and Mn3+ is reducing in nature. |
II: | Sc3+ compounds are repelled by the applied magnetic field. |
1. | Both I and II are correct. |
2. | Both I and II are incorrect. |
3. | I is correct but II is incorrect. |
4. | I is incorrect but II is correct. |
Identify the pair of Lanthanoides with one strong oxidant and one strong reductant:
1. | Ce(IV), Tb(IV) | 2. | Yb(II), Eu(II) |
3. | Eu(IV), Lu(III) | 4. | Ce(IV), Eu(II) |
Match the statements given in List-I with the corresponding element given in List-II:
List-I | List-II | ||
(a) | Element that exhibits +3 oxidation state only. | (i) | Mn |
(b) | An element that exhibits more number of oxidation states. | (ii) | Zn |
(c) | Element which is a reducing agent in its +2 oxidation state. | (iii) | Sc |
(d) | An element that is not considered as a transition element. | (iv) | Cr |
(a) | (b) | (c) | (d) | |
1. | (iii) | (iv) | (i) | (ii) |
2. | (iv) | (i) | (ii) | (iii) |
3. | (ii) | (iv) | (iii) | (i) |
4. | (iii) | (i) | (iv) | (ii) |
1. | +6 to +5 | 2. | +7 to +4 |
3. | +6 to +4 | 4. | +7 to +3 |
1. | High basic character | 2. | Small size |
3. | High exchange enthalpy | 4. | High electronegativity |
A. | All the transition metals except scandium form MO oxides which are ionic. |
B. | The highest oxidation number corresponding to the group number on transition metal oxides is attained in Sc2O3 to Mn2O7. |
C. | Basic character increases from V2O3 to V2O4 to V2O5. |
D. | V2O4 dissolves in acids to give VO43-. |
E. | CrO is basic but Cr2O3 is amphoteric. |
1. | B and C only | 2. | A and E only |
3. | B and D only | 4. | C and D only |
Assertion (A): | Ionization enthalpy increases along each series of transition elements from left to right. However, small variations occur. |
Reason (R): | There is a corresponding increase in nuclear charge which accompanies the filling of electrons in the inner d-orbitals. |
1. | (A) is correct but (R) is not correct |
2. | (A) is not correct but (R) is correct |
3. | Both (A) and (R) are correct and (R) is the correct explanation of (A) |
4. | Both (A) and (R) are correct but (R) is not the correct explanation of (A) |
Assertion (A): | Ionisation enthalpies of early actinoids are lower than for early lanthanoids. |
Reason (R): | Electrons are entering 5f orbitals in actinoids which experience greater shielding from nuclear charge. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | (A) is False but (R) is True. |