d- and f-Block Elements

The amphoteric oxide among V2O3, V2O4 and V2O5, upon reaction with alkali leads to formation of an oxide anion. The oxidation state of V in the oxide anion is :

1. + 4
2. + 5
3. + 3
4. + 7

The spin only magnetic moment ( ) value (B.M.) of the compound with the strongest oxidising power among Mn2O3, TiO and VO is B.M. (Nearest integer).

Preparation of potassium permanganate from MnO2 involves two step process in which the 1st step is a reaction with KOH and KNO3 to produce

1. K3MnO4
2. K4[Mn(OH)6]
3. K2MnO4
4. KMnO4

Which of the following ions is the strongest oxidizing agent? (Atomic Number of Ce = 58, Eu = 63, Tb = 65, Lu = 71)

1. Lu3+
2. Eu2+
3. Tb4+
4. Ce3+

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

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

The correct set of ions (aqueous solution) with same colour from the following is:

1. V2+, Cr3+, Mn3+
2. Ti4+, V4+, Mn2+
3. Sc3+, Ti3+, Cr2+
4. Zn2+, V3+, Fe3+

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

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

Consider the following reactions K2Cr2O7 [-H2O]KOH [A] [-H2O]H2SO4 [B] + K2SO4 The products [A] and [B], respectively are :

1. K2Cr(OH)6 and Cr2O3
2. K2CrO4 and Cr2O3
3. K2CrO4 and K2Cr2O7
4. K2CrO4 and CrO

Lanthanoid ions with 4f7 configuration are : Choose the correct answer from the options given below :

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

The electronic configuration of Cu(II) is 3d9 whereas that of Cu(I) is 3d10. Which of the following is correct?

1. Cu(II) is more stable
2. Cu(II) is less stable
3. Cu(I) and Cu(II) are equally stable
4. Stability of Cu(I) and Cu(II) depends on nature of copper salts