d- and f-Block Elements

A and B formed in the following reactions are: CrO2Cl2 + 4NaOH A + 2NaCl + 2H2O, A + 2HCl + 2H2O2 B + 3H2O

1. A = Na2Cr2O7, B = CrO5
2. A = Na2CrO4, B = CrO5
3. A = Na2Cr2O4, B = CrO4
4. A = Na2Cr2O7, B = CrO3

Alkaline oxidative fusion of MnO2 gives "A" which on electrolytic oxidation in alkaline solution produces B. A and B respectively are

1. Mn2O3 and MnO42-
2. Mn2O7 and MnO4-
3. MnO42- and MnO4-
4. MnO42- and Mn2O7

The orange colour of K2Cr2O7 and purple colour of KMnO4 is due to

1. Charge transfer transition in both.
2. d d transitions in KMnO4 and charge transfer transitions in K2Cr2O7.
3. d d transitions in both
4. d d transitions in K2Cr2O7 and charge transfer transitions in KMnO4.

KMnO4 decomposes on heating at 513 K to form O2 along with

1. K2MnO4 & Mn
2. MnO2 & K2O2
3. K2MnO4 & MnO2
4. Mn & KO2

In alkaline medium, MnO4- oxidises I- to

1. I2
2. IO3-
3. IO-
4. IO4-

Which of the following acts as a strong reducing agent? (Atomic number: Ce = 58, Eu = 63, Gd = 64, Lu = 71)

1. Eu2+
2. Gd3+
3. Lu3+
4. Ce4+

Which of the following statements are correct about Zn, Cd and Hg? Choose the most appropriate from the options given below:

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

Which of the following electronic configuration would be associated with the highest magnetic moment?

1. [Ar]3d7
2. [Ar]3d8
3. [Ar]3d3
4. [Ar]3d6

The electronic configuration for Neodymium is: [Atomic Number for Neodymium 60]

1. [Xe]4f4 6s2
2. [Xe]5f4 7s2
3. [Xe]4f6 6s2
4. [Xe]4f1 5d1 6s2

Identify the incorrect pair from the following :

1. Haber process - Iron
2. Polythene preparation - TiCl4, Al(CH3)3
3. Photography - AgBr
4. Wacker process - PtCl2