d- and f-Block Elements · Question 78

Although +3 oxidation state is most common in lanthanoids, cerium still shows +4 oxidation state because :

1. After losing one more electron, it acquires 4f14 electronic configuration.
2. Its nearest inert gas is Radon.
3. After losing one more electron, it acquires 4f0 electronic configuration.
4. Its atomic number is 61.

The calculated 'spin-only' magnetic moment of Ti2+ (3d2) is :

1. 3.87 BM
2. 4.90 BM
3. 2.84 BM
4. 5.92 BM

Match List I with List II :

1. A-III, B-IV, C-I, D-II
2. A-III, B-I, C-IV, D-II
3. A-II, B-I, C-IV, D-III
4. A-IV, B-I, C-III, D-II

The lanthanide ion having four unpaired electrons is (Given : Atomic numbers of Ce = 58, Nd = 60, Tb = 65 and Ho = 67)

1. Ho3+
2. Nd3+
3. Ce3+
4. Tb3+

The green paramagnetic species formed by heating KMnO4 at 513 K is

1. KO2
2. K2MnO4
3. Mn3O4
4. MnO

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. In light of the above statements, choose the most appropriate answer from the options given below:

1. A is not correct but R is correct
2. Both A and R are correct and R is the correct explanation of A
3. Both A and R are correct and R is NOT the correct explanation of A
4. A is correct but R is not correct.

Match List - I with List - II. Choose the correct answer from the options given below :

1. A-I, B-II, C-III, D-IV
2. A-I, B-IV, C-III, D-II
3. A-I, B-II, C-IV, D-III
4. A-II, B-III, C-I, D-IV

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :

1. Statement I is true but Statement II is false
2. Statement I is false but Statement II is true
3. Both Statement I and Statement II are true
4. Both Statement I and Statement II are false

'Spin only' magnetic moment is same for which of the following ions? Choose the most appropriate answer from the options given below.

1. B and D only
2. A and E only
3. B and C only
4. A and D only

The E value for the Mn3+/Mn2+ couple is more positive than that of Cr3+/Cr2+ or Fe3+/Fe2+ due to change of

1. d5 to d4 configuration
2. d5 to d2 configuration
3. d4 to d5 configuration
4. d3 to d5 configuration