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Uses of Lanthanides

Which of the ...

Question

Which of the following statements is not correct regarding Lanthanoids and Actinoids ?

A

Oxidation state +3 is predominant in both theseries.

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B

In both the series f-orbitals are being progressively filled

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C

the elements of both the series are radioactive

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D

Both series show contraction as Lanthanide contraction and actinide contraction.

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Solution

The correct option is C the elements of both the series are radioactive
The statements "the elements of both the series are radioactive" is not correct regarding Lanthanoids and Actinoids.
All the members of actinoids are radioactive whereas in lanthanoids, only promethium is radioactive.

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Similar questions

Q. The effect of lanthanoid contraction in the lanthanoid series of elements by and large means:

Q. Due to 'lanthanide contraction', second and third row transition elements (called 4d and 5d series series respectively) have similar property/properties. These properties is/are :

Q. (i) Why do transition elements show variable oxidation states?
(ii) Name the element showing maximum number of oxidation states among the first series of transition metals from

S c (Z = 21)

Z n (Z = 30)

.
(iii) Name the element which shows only

+ 3

oxidation state.
(iv) What is lanthanoid contraction? Name an important alloy which contains some of the lanthanoid metals.

Q. Actinoid contraction is greater than lanthanoid contraction because the shielding effect of 5f orbitals is poorer than that of 4f orbitals, then why is the ionisation enthalpies of actinoids less than that of the lanthanoids?

Q. Give reason:

(a) Cerium(Ce) exhibits

+ 4

oxidation state.

(b) Actinoid contraction is greater from element to element than lanthanoid contraction.

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