Generally transition elements and their salts are coloured due to the presence of unpaired electrons in metal ions. Which of the following compounds are coloured?

a. KMnO₄

b. Ce(SO₄)₂

c. TiCl₄

d. Cu₂Cl₂

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

General electronic configuration of actionoids is (n–2)f ^1–14 (n-1)d^0–2ns².Which of the following actinoids have one electron in 6d orbital?

a. U (Atomic no. 92)

b. Np (Atomic no.93)

c. Pu (Atomic no. 94)

d. Am (Atomic no. 95)

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

Although +3 is the characteristic oxidation state for lanthanoids but cerium also shows +4 oxidation state because ___________.

a. It has variable ionisation enthalpy

b. It has a tendency to attain noble gas configuration

c. It has a tendency to attain f⁰ configuration

d. It resembles Pb⁴⁺

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)

Which of the following oxidation state is common for all lanthanoids?

1.  +2

2.  +3

3.  +4

4.  +5

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

1. U

2. Np

3. Tm

4. Fm

Match the property given in Column I with the element given in Column II.

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