Transition metals show paramagnetic behaviour due to:

1. Paired electrons in the (n-1) d-orbitals

2. Unpaired electrons in the (n-1) d-orbitals

3. Due to ${\mathrm{d}}^{10}, \mathrm{and} {\mathrm{d}}^0$ configuration

4. None of the above

Mn²⁺ compounds are more stable than Fe²⁺ compounds towards oxidation in their +3 state because

1. 3d⁵ configuration is more stable than 3d⁶ configuration.

2. 3d⁶ configuration is more stable than 3d⁵ configuration.

3. 3p⁵ configuration is less stable than 3p⁶ configuration.

4. 3p⁶ configuration is less stable than 3p⁵ configuration.

The correct statement(s) about interstitial compounds is/are:

1. Transition elements are large in size and contain multiple interstitial sites.

2. Transition elements can trap atoms of other elements.

3. Interstitial compounds are chemically inert.

4. All of the above.

Match the properties given in Column I with uses given in Column II

Codes

          A          B          C

1.       3          1           2

2.       1          2           3

3.       1          4           3

4.       4          2           3

The d-block elements that may not be regarded as transition elements are

1. Mn, Fe, Ni because these have partially filled d-subshell.

2. Mn, Fe, Ni because these have completely filled d-subshell.

3. Zn, Cd, and Hg because these have completely filled d-subshell.

4. Zn, Cd, and Hg because these have partially filled d-subshell.

An element among the following that exhibits the maximum oxidation state is:

1. Cr

2. Mn

3. Fe

4. V

The correct statement(s) regarding the oxidation state of transition elements is/are:

1. The oxidation state can vary from +1 to +7

2. Variable oxidation states are possible.

3. Both (1) and (2) 

4. None of the above

Match the catalysts given in Column I with the processes given in Column II.

Codes

           A          B          C           D

1.        3          4           2           5

2.        2          3           1           4

3.        5          4           3           2

4.        4          5          3            2

The correct statement(s) about transition elements is/are:

1. The lowest oxide of a transition metal is basic, the highest is amphoteric/acidic.

2. A transition metal exhibits the highest oxidation state in oxides and fluorides.

3. The highest oxidation state is exhibited in the oxo anions of a metal.

4. All of the above.

An element that does not show variable oxidation state is:

1. Fe

2. Mn

3. Cu

4. Zn