d- and f-Block Elements · Question 4

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

The pair of lanthanoid ions which are diamagnetic is

1. Ce4+ and Yb2+
2. Ce3+ and Eu2+
3. Gd3+ and Eu3+
4. Pm3+ and Sm3+

Which of the following pairs of ions will have same spin only magnetic moment values within the pair? Choose the correct answer from the options given below :

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

Which of the following set of ions act as oxidising agents?

1. Ce4+ and Tb4+
2. La3+ and Lu3+
3. Eu2+ and Yb2+
4. Eu2+ and Tb4+

The UV-visible absorption bands in the spectra of lanthanoid ions are 'X', probably because of the excitation of electrons involving 'Y'. The 'X' and 'Y', respectively, are :

1. Broad and f orbitals
2. Narrow and f orbitals
3. Broad and d and f orbitals
4. Narrow and d and f orbitals