The number of 3d electrons in the Cr3+ ions will be:
1. | 5 | 2. | 6 |
3. | 3 | 4. | 7 |
The correct statement regarding the element silver(Ag) is:
1. | It is a hard metal. |
2. | It is not a transition element. |
3. | It has a partially filled d orbital in a +2 oxidation state. Thus, it is a transition element. |
4. | None of the above |
The enthalpy of atomization of transition metals is high due to :
1. High effective nuclear charge
2. A large number of valence electrons
3. Very strong metallic bonds
4. All of the above
The transition metals generally form coloured compounds due to :
1. | Absorption of radiation to promote an electron . |
2. | Presence of ligands, the d-orbitals split up into two sets of orbitals. |
3. | Energy required to promote an electron in d subshell is low. |
4. | All of the above. |
Match the following :
Elements | Electronic configuration |
i. 61 | a. [Rn]5f136d0 7s 2 |
ii. 91 | b. [Xe]4f56s2 |
iii. 101 | c. [Rn]5f146d77s2 |
iv. 109 | d. [Rn] 5f2 6d17s2 |
i | ii | iii | iv | |
1. | b | d | a | c |
2. | c | a | d | b |
3. | c | d | a | b |
4. | a | c | b | d |
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
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