Q. No.An element among the following that shows the maximum number of oxidation states is:
1. Cr
2. Fe
3. Mn
4. V
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
Match the following aspects with the respective metal.
Aspects Metal
(a) The metal which reveals a (i) Scandium
maximum number of
oxidation states
(b) The metal although placed (ii) Copper
in 3d block is considered
not as a transition element
(c) The metal which does not (iii) Manganese
exhibit variable oxidation states
(d) The metal which in +1 (iv) Zinc
oxidation state in aqueous
solution undergoes
disproportionation
Select the correct option :
(1) (a)-(i) (b)-(iv) (c)-(ii) (d)-(iii)
(2) (a)-(iii) (b)-(iv) (c)-(i) (d)-(ii)
(3) (a)-(iii) (b)-(i) (c)-(iv) (d)-(ii)
(4) (a)-(ii) (b)-(iv) (c)-(i) (d)-(iii)
1. 3
2. 4
3. 2
4. 1
| Assertion (A): | Transition metals and their compounds are effective catalysts. |
| Reason (R): | They have the ability to adopt multiple oxidation states and to form complexes. |
| 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. | Both (A) and (R) are false. |
Gadolinium (atomic number 64) belongs to the 4f series.
The correct electronic configuration of gadolinium among the following is:
\(1. (X e) 4 f^{7} 5 d^{1} 6 s^{2} \)
2. \( (X e) 4 f^{6} 5 d^{2} 6 s^{2}\)
3. \((X e) 4 f^{8} 6 d^{2}\)
4. \((X e) 4 f^{9} 5 s^{1}\)
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
| 1. | The extra stability of configurations such as d5, d10 |
| 2. | The less stability of configurations such as d5, d10 |
| 3. | The extra stability of configurations such as d4, d6 |
| 4. | The extra stability of configurations such as d7, d8 |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
The magnetic nature of elements depends on the presence of unpaired electrons. Identify the configuration of the transition element, which shows the highest magnetic moment.
| 1. | 2. | ||
| 3. | 4. |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
1. inert pair effect.
2. completely filled 3d sub-shell.
3. completely filled 4s sub-shell.
4. common ion effect.
A pair of ions that have the same electronic configuration among their constituent species is:
1. \(Sr^{3+}, Cr^{3+}\)
2. \(Fe^{3+}, Mn^{2+}\)
3. \(Fe^{3+}, Co^{3+}\)
4. \(Cr^{3+}, Fe^{3+}\)
Which transition element does not exhibit variable oxidation states?
1. Manganese (\(Mn\))
2. Chromium(\(Cr\))
3. Scandium(\(Sc\))
4. Iron(\(Fe\))
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
© 2026 GoodEd Technologies Pvt. Ltd.