In the listed lanthanoids, the element that displays a +2 oxidation state along with the characteristic +3 oxidation state of lanthanoids is:

(a) Ce

(b) Eu

(c) Yb

(d) Ho

Choose the correct option

1.	(a, b)	2.	(b, c)
3.	(c, d)	4.	(a, d)

Which of the following ions show a higher spin-only magnetic moment value?

$\mathrm{a}. {\mathrm{Ti}}^{3+}$
$\mathrm{b}. {\mathrm{Mn}}^{2+}$
$\mathrm{c}. {\mathrm{Fe}}^{2+}$
$\mathrm{d}. {\mathrm{Co}}^{3+}$

Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

 Which of the following actinoids show oxidation states upto +7?

(a) Am

(b) Pu

(c) U

(d) Np

Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (b, d)

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 largest oxidation number exhibited by an element depends on its electronic configuration. With which of the following electronic configurations will the element exhibit the largest oxidation number?

1. 3d¹4s²

2. 3d³4s²

3. 3d⁵4s¹

4. 3d⁵4s²

Electronic configuration of a transition element X in +3 oxidation state is [Ar]$3d^5$. What is its atomic number?

The electronic configuration of Cu(II) is $3d^9$ whereas that of Cu(I) is $3d^{10}$, the correct statement about the aqueous solution of  Cu(II) and Cu(I) among the following is:

Metallic radii of some transition elements are given below. Which of these elements will have highest density?

The coloured compound among the following in the solid state is:
1. \( \mathrm{Ag}_{2} \mathrm{SO}_{4} \)
2. \(\mathrm {C u F}_{2} \)
3. \(\mathrm {Zn F}_{2} \)
4. \(\mathrm{Cu}_{2} \mathrm{Cl}_{2} \)

On addition to a small amount of KMnO₄ to concentrated H₂SO₄, a green oily compound is obtained which is highly explosive in nature. Identify the compound from the following.

1. Mn₂O₇

2. MnO₂

3. MnSO₄

4. Mn₂O₃