Oxidation States of Actinides

Q. What is the hybridization of the complex [Mn(CN)₆]^3- ?
[Dear mentor please give the detailed solution.]

Q. The reason for greater range of oxidation states in actinoids is attributed to

1. Actinoid contraction
2. 5f, 6d and 7s levels having comparable energies
3. 4f and 5d levels being close in energies
4. The radioactive nature of actionoids.

Q. ntIn the complex [Pt(py)4] [PtCl4] , the oxidation number of Pt atom in former and later part of this compound are what?n

Q.

A member of the lanthanoid series which is well known to exhibit +4 oxidation state is:

1. Cerium

2. Europium

3. Lutetium

4. Thulium

Q. Which is the most stable oxidation state of actinoids?

1. +2
2. +3
3. +4
4. +5

Q. Correct order of boling point of d-block series of corresponding elements is

1. 3d > 4d > 5d
2. 3d < 4d < 5d
3. 3d > 4d $\approx$ 5d
4. 3d < 4d $\approx$ 5d

Q.

Can you explain (every small detail) about the hybridisation of Cr in K2Cr2O7 being d3s? Why d3s and not d5?

Q. The most common oxidation state of Lanthanoid elements is +3. Which of the following is likely to deviate easily from +3 oxidation state?

1. Lu (At. No. 71)
2. Gd (At. No. 64)
3. La (At. No. 57)
4. Ce (At. No. 58)

Q. Among the 3d series, ___ has the highest stable oxidation state.

Q. Inert pair effect

Q. Which of the following is not a member of 3d transition series?

1. $Ti$
2. $V$
3. $Cu$
4. $Ag$

Q.

Which of the following group of elements are not regarded as transition elements?

1. Zn, Cd, Hg

2. Sc, Y, La

3. Cu, Ag, Au

4. Cr , Mo, W

Q.

What are the oxidation number of the underlined elements in each of the following and how do you rationalise your results?

(a) KI₃ (b) H₂S₄O₆ (c) Fe₃O₄ (d) CH₃CH₂OH (e) CH₃COOH

Q.

Explain why Cr2+ is reducing but Mn3+ is oxidising while both ions have d4 configuration?

Q. Which is the most stable oxidation state of actinoids?

1. +2
2. +3
3. +4
4. +5

Q. The most common oxidation state of actinide is:

1. $+2$
2. $+1$
3. $+3$
4. $+4$

Q. Actinoids in general show more oxidation states than the lanthanoids. The main reason for this is:

1. higher energy difference between 5f and 6d orbitals than between 4f and 5d orbitals
2. lower energy difference between 5f and 6d orbitals than between 4f and 5d orbitals
3. actinoids are more basic than lanthanoids
4. higher reactivity of actinoids than lanthanoids

Q.

1. Both Assertion and Reason are correct and Reason is correct explanation for Assertion.
2. Both Assertion and Reason are correct and Reason is not correct explanation for Assertion
3. Both Assertion is correct but Reason incorrect.
4. Both Assertion and Reason are incorrect

Q. The maximum oxidation state exhibited by actinide ions is:

1. $+5$
2. $+4$
3. $+7$
4. $+8$

Q. Which of the following exhibit only +3 oxidation state?

1. $U$
2. $Th$
3. $Ac$
4. $Pa$

Q. Which of the following actinoids show oxidation states up to +7?

1. Am
2. Pu
3. U
4. Np

Q. Why $S{m}^{+2}$ ions in solution are good reducing agent but an aqueous solution of $C{e}^{+4}$ is a good oxidising agent?

Q. The members of Actinoid series exhibit larger number of oxidation states as compared to lanthanoid elements.

Q. The reason for greater range of oxidation states in actinoids is attributed to:

1. $4f$ and $5d$ levels being close in energies.
2. the radioactive nature of actinoids.
3. actinoid contraction.
4. $5f,6d$ and $7s$ levels having comparable energies.

Q. The reason for greater range of oxidation states in actinoids is attributed to:

1. The radioactive nature of actinoids
2. Actinoid contraction
3. $5f,6dand7s$ levels having comparable energies
4. $4fand5d$ levels being close in energies

Q. Actinide element that exhibits the highest oxidation state in its compounds (atomic numbers Th(90), U*, Np(93), Fm(100)

1. Th
2. U*
3. Np
4. Fm

Q. The highest possible oxidation states of uranium and plutonium, respectively, are:

1. $6$ and $4$
2. $7$ and $6$
3. $4$ and $6$
4. $6$ and $7$

Q. colour of [Ti(H2O)6]³+ is due to?

Q. The oxidation state of uranium in the compound $U{O}_{2}C{l}_2$ is:

1. 4
2. 6
3. 5
4. 3

Q. The reason for greater range of oxidation states in actinoids is attributed to:

1. The radioactive nature of actinoids
2. Actinoid contraction
3. $5f,6dand7s$ levels having comparable energies
4. $4fand5d$ levels being close in energies