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 the compounds/elements given in Column I with uses given in Column II.

Column 
(Compound/element)
Column II
(Use)
A. Lanthanoid oxide 1. Petroleum cracking
B.  Lanthanoid 2.  Television screen
C. Mischmetal 3. Lanthanoid metal + iron
D. Mixed oxides of lanthanoids are
employed
4. Production of iron alloy

Codes
 

Options: A B C D
1. 2 1 4 3
2. 1 2 3 4
3. 2 4 3 1
4. 4 1 3 2
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: Actinoids form relatively less stable complexes as compared to lanthanoids.

Reason: 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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