The metallic radii of some transition elements are given below. An element that has the highest density is:

Element	Fe	Co	Ni	Cu
Metallic radii/pm	126	125	125	128

1. Fe 

2. Ni

3. Co

4. Cu

A compound that has coloure in solid state is -

1. Ag₂SO₄

2.  CuF₂

3. ZnF₂

4. Cu₂Cl₂

On addition of small amount of KMnO₄, to concentrated H₂SO₄, a green oily compound is obtained which is highly explosive in nature. What is the compound ?
$1. {\mathrm{Mn}}_2{\mathrm{O}}_7$
$2. {\mathrm{MnO}}_2$
$3. {\mathrm{MnSO}}_4$
$4. {\mathrm{Mn}}_2{\mathrm{O}}_3$

The magnetic nature of elements depends on the presence of unpaired electrons. Which of the configuration of transition element will shows highest magnetic moment ?

$1. 3{\mathrm{d}}^7$

$$
$2. 3{\mathrm{d}}^5$

$$
$3. 3{\mathrm{d}}^8$

$$
$4. 3{\mathrm{d}}^2$

There are 14 elements in actinoid series. Which of the following elements does not belong to this series?

1. U

2. Np

3. Tm

4. Fm

The electronic configuration of gadolinium (atomic number of 64) is:

1. $\left[\mathrm{Xe}\right]4{\mathrm{f}}^{3}5{\mathrm{d}}^{5}6{\mathrm{s}}^2$

2. $\left[\mathrm{Xe}\right]4{\mathrm{f}}^{7}5{\mathrm{d}}^{2}6{\mathrm{s}}^1$

3. $\left[\mathrm{Xe}\right]4{\mathrm{f}}^{7}5{\mathrm{d}}^{1}6{\mathrm{s}}^2$

4. $\left[\mathrm{Xe}\right]4{\mathrm{f}}^{8}5{\mathrm{d}}^{6}6{\mathrm{s}}^2$

The actinoid that can show oxidation states up to +7 is:

1. Am

2. Th

3. U

4. Np

An actinoid that does not have one electron in its 6d orbital is -

Which of the following has the highest spin-only magnetic moment value?

1. ${\mathrm{Ti}}^{3+}$

2. ${\mathrm{Mn}}^{2+}$

3. ${\mathrm{Fe}}^{2+}$

4. ${\mathrm{Co}}^{3+}$

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

Codes