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The paramagnetic behaviour of lanthanoids can easily be explained on the basis of the electron spin.

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Important Questions on The d- and f-Block Elements

EASY

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

The pair that has similar atomic radii is:

MEDIUM

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

Which of the following lanthanoid is diamagnetic?

Atomic no's $Sm = 62, Ce = 58, Eu = 63, Yb = 70$

MEDIUM

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

Among

Ce (4 f^{1} 5 d^{1} 6 s^{2}), Nd (4 f^{1} 6 s^{2}), Eu (4 f^{7} 6 s^{2})

and

Dy (4 f^{10} 6 s^{2})

, the elements having highest and lowest

3

rd ionisation energies, respectively are

EASY

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

Which statement is incorrect with reference to inner transition elements?

EASY

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

Which of the following lanthanide ions has the highest number of unpaired electrons?

EASY

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

Which of the following properties is NOT of lanthanoids?

EASY

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

Which of the following elements has the largest atomic radius?

MEDIUM

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

Which one of the following lanthanides exhibits

+ 2

oxidation state with diamagnetic nature ? (Given

Z

for

Nd = 60, Yb = 70, La = 57, Ce = 58)

EASY

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

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

EASY

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

The lanthanide ion that would show colour is:

EASY

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

Which of the following elements involves gradual filling of

4 f

- levels?

EASY

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

Write down the electronic configuration of

{Pm}^{3 +}

MEDIUM

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

Read the following statements and choose the correct option.
(i) $f$ -block elements of $6^{th}$ period are called lanthanoids.
(ii) $f$ -block elements of $7^{th}$ period are called actinoids.

EASY

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

Decrease in ionic size in a period is observed in

HARD

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

The incorrect statement among the following is:

EASY

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

Define lanthanoid contraction. Write two consequences of lanthanoid contraction.

EASY

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

Match List-I with List-II and select the correct answer using the codes given below:

List-I		List-II
(A)	Electronic configuration of americium.	1.	Corrosive Sublimate
(B)	$BM$ of ${Sm}^{3 +}, {La}^{3 +}, {Gd}^{3 +}$	2.	$[Rn] 5 f^{7} s^{2}$
(C)	$TiC l_{4} \overset{H_{2} O}{\to}$ Amphoteric white solid	3.	$5.9, 0.0, 7.94$
(D)	${Hg}_{2} C l_{2} \overset{aqua - regia}{\to}$ Compound used in antiseptic and dressing skin	4.	${TiO}_{2}$