d- and f-Block Elements

The metals that are employed in the battery industries are Choose the correct answer from the options given below:

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

Choose the correct statements from the following Choose the correct answer from the options given below :

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

In the reaction of potassium dichromate, potassium chloride and sulfuric acid (conc.), the oxidation state of the chromium in the product is (+) .

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

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

Diamagnetic Lanthanoid ions are :

1. La3+ \& Ce4+
2. Nd3+ \& Ce4+
3. Lu3+ \& Eu3+
4. Nd3+ \& Eu3+

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-