Transition metals and their many compounds act as good catalysts due to :
1. | Variable oxidation states | 2. | Unstable intermediate |
3. | Provide a suitable surface | 4. | All of the above |
Transition metals show paramagnetic behaviour due to:
1. | Paired electrons in the (n-1) d-orbitals | 2. | Unpaired electrons in the (n-1) d-orbitals |
3. | Due to \(d^{10},\) and \(d^{0}\) configuration | 4. | None of the above |
Consider the following statements:
a. | Lanthanoid and actinoid belong to the f block and their general electronic configuration is nf1-14 n-1d0-1ns2 . |
b. | All lanthanides and actinoids show an oxidation state of +3. |
c. | The magnetic properties of the actinoids are more complex than those of the lanthanoids. |
d. | Lanthanoids are comparatively less electropositive than actinides |
Correct statements amongst the above are:
1. | a, b | 2. | c, d, a |
3. | d, a, b | 4. | b, c, d |
The correct statement(s) about interstitial compounds is/are:
1. | Transition elements are large in size and contain multiple interstitial sites. |
2. | Transition elements can trap atoms of other elements. |
3. | Interstitial compounds are chemically inert. |
4. | All of the above. |
The spin-only magnetic moment of is -
1. | 3.25 | 2. | 1.73 |
3. | zero | 4. | 4.21 |
In an aqueous solution, coloured ions would be:
1.
2.
3.
4. None of the above.
The correct reactions among the following are:
1. a and c
2. b and c
3. a and b
4. a, b and c
Select the appropriate statement(s) from the following options:
1. | The maximum oxidation state of the d block elements appears in the middle and the minimum at the extreme ends. |
2. | IE1 of third transition series elements is smaller than IE1 of second and first transition series elements. |
3. | The atomic sizes of the elements in the 3d series are greater than those in the 4d or 5d series. |
4. | Both (1) and (2) |
The correct statement regarding inner transition elements is
1. | The general electronic configuration of actinoids is |
2. | The general electronic configuration of lanthanoids is |
3. | Alkalies have no action on actinoids. |
4. | The principal oxidation state of lanthanoids is +1. |
The most common oxidation state for lanthanoids and actinoids is:
1. +5
2. -3
3. +1
4. +3