Which of the following statements is true? 

1.	Cu(II)aq is more stable.
2.	Cu(II)aq 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.

Based on the metallic radii provided, which transition element exhibits the highest density?

1. Fe 

2. Ti

3. Co

4. Cu

A compound that has coloure in solid state is:

1. \(Ag_2SO_4\)

2. \(CuF_2\)

3. \(ZnF_2\)

4. \(Cu_2Cl_2\)

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

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

$1.<mspace\; width="1em"></mspace>3{\mathrm{d}}^7$

$$
$2.<mspace\; width="1em"></mspace>3{\mathrm{d}}^5$

$$
$3.<mspace\; width="1em"></mspace>3{\mathrm{d}}^8$

$$
$4.<mspace\; width="1em"></mspace>3{\mathrm{d}}^2$

Which of the following elements does not belong to the actinoid series?
1. Uranium (U)
2. Neptunium (Np)
3. Thulium (Tm)
4. Fermium (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. ${\mathrm{Co}}^{3+}$