In the listed lanthanoids, the element that displays a +2 oxidation state along with the characteristic +3 oxidation state of lanthanoids is:

(a) Ce

(b) Eu

(c) Yb

(d) Ho

Choose the correct option

1. (a, b) 2. (b, c)
3. (c, d) 4. (a, d)
Subtopic:  Lanthanoid & Actinoids Contraction |
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Match Compound/element in Column-I with uses in Column-II and select the best match from the codes given:

Column-I
(Compound/element)
Column-II
(Uses)
A. Lanthanoid oxide I. Petroleum cracking
B. Lanthanoid II. Television screen
C. Mischmetal III. Lanthanoid metal + iron
D. Mixed oxides of lanthanoids are employed IV. Production of iron alloy
 
Options: A B C D
1. II I IV III
2. I II III IV
3. II IV III I
4. IV I III II
Subtopic:  Lanthanoid & Actinoids Contraction |
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Match the statements given in Column I with the oxidation states given in Column and mark the correct option.

Column I Column II
A.  Oxidation state of Mn in  \(\mathrm{MnO}_2\)  is 1.  +2
B.  Most stable oxidation state of Mn is 2.  +3
C.  Most stable oxidation state of Mn in oxides is 3.  +4
D.  Characteristic oxidation state of lanthanoids is 4.  +5
5.  +7

    

Options: 
1.  2 3 4 1
2.  3 1 5 2
3.  5 4 3 2
4.  4 5 3 2
Subtopic:  Lanthanoid & Actinoids Contraction |
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Assertion (A): Actinoids form relatively less stable complexes as compared to lanthanoids.
Reason (R): Actinoids can utilise their 5f orbitals along with 6d orbitals in bonding but lanthanoids do not use their 4f orbital for bonding.

 

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 not True but (R) is True.
4. Both (A) and (R) are False.
Subtopic:  Lanthanoid & Actinoids Contraction |
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