d and f Block Test

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d and f Block Test - 5

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Weekly Quiz Competition

Question 1
1 / -0.25

Only One Option Correct Type
Direction (Q. Nos. 1- 10) This section contains 10 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.
Q.
Set of continuous atomic numbers of elements are present in the same group as well as same period.

A
56,57,58,59

B
88,89,90,91

C
101,102,103,104

D
68,69,70,71

Solution

Er (68), Tm (69), Yb (70) and Lu (71) elements are present in same group as well as same period.
Question 2
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The element with atomic number 62 belongs

A
III A group and 6th period

B
III B group and 7th period

C
IV B group and 7th period

D
III B group and 6th period

Solution

Samarium (Sm) (Z = 62) belongs to III B group and 6th period.
Question 3
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The radius of lanthanum is 1.06 Å. Then which of the following is closest to the radius of Lu3+ ion

A
1.06 Å

B
1.4 Å

C
1.6 Å

D
0.85 Å

Solution

Due to lanthanoid contraction.
Question 4
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+ 4 ion of which has half-filled 4f subshell

A
Tb

B
Lu

C
Gd

D
Eu

Solution

Tb (Z = 65) have [Xe] 4f⁹ 5d⁰ 6s² configuration. Tb⁴⁺ have half-filled 4f subshell, i.e. 4f⁷ .
Question 5
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Lanthanide for which + II and + III oxidation states are common is

A
La

B
Nd

C
Ce

D
Eu

Solution

Europium (Eu) has [Xe] 4f⁷ 5d⁰ 6s² configuration. The oxidation state of + 2 and + 3 are exhibited by these elements, e.g. Eu²⁺ is[Xe] 4f⁷ and Eu³⁺ is [Xe]4f⁶ .
Question 6
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An alloy of lanthanide

A
misch metal

B
nichrome

C
wood metal

D
type metal

Solution

Misch metal is lanthanide metal (95%) and iron (5%) and traces of S, C, Ca, Al.
Question 7
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Across the lanthanide series, the basicity of the lanthanide hydroxides

A
increases

B
decreases

C
first increases and then decreases

D
first decreases and then increases

Solution

The basicity decreases from Ce(OH)₃ to Lu(OH)₃ . Due to lanthanide contraction, the decrease in the size of the cation increases the covalent character between the lanthanide ion and hydroxide ion thereby, reducing the basic character of the lanthanide hydroxide.
Question 8
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Gadolinium belongs to 4f series. Its atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?

A
[Xe] 4f⁷ 5d¹ 6s²

B
[Xe] 4f⁶ 5d² 6s²

C
[Xe] 4f⁸ 6d²

D
[Xe] 4f⁹ 5s¹

Solution

Gadolinium (Gd) have [Xe] 4f⁷ 5d¹ 6s² configuration.
Question 9
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Lanthanides contraction causes

A
small increase in basic strength of oxides of lanthanides

B
great variation in chemical properties of lanthanides

C
small increase in electronegativities of lanthanides

D
small decrease in standard electrode potential value of lanthanides

Solution

Electronegativity increases as we move from left to right due to lanthanide contraction.
Question 10
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Which one of the following statement(s) is/are incorrect for lanthanides?

A
Lanthanide metal ions are mostly coloured

B
Lanthanides have high melting and boiling points

C
Lanthanides have low densities

D
Lanthanides have high ionisation energy

Solution

The hardness increases with increasing atomic number.

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Re-Attempt Weekly Quiz Competition

d and f Block Test - 5

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d and f Block Test - 5

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Question 1

56,57,58,59

88,89,90,91

101,102,103,104

68,69,70,71

Solution

Question 2

III A group and 6th period

III B group and 7th period

IV B group and 7th period

III B group and 6th period

Solution

Question 3

1.06 Å

1.4 Å

1.6 Å

0.85 Å

Solution

Question 4

Tb

Lu

Gd

Eu

Solution

Question 5

La

Nd

Ce

Eu

Solution

Question 6

misch metal

nichrome

wood metal

type metal

Solution

Question 7

increases

decreases

first increases and then decreases

first decreases and then increases

Solution

Question 8

[Xe] 4f7 5d1 6s2

[Xe] 4f6 5d2 6s2

[Xe] 4f8 6d2

[Xe] 4f9 5s1

Solution

Question 9

small increase in basic strength of oxides of lanthanides

great variation in chemical properties of lanthanides

small increase in electronegativities of lanthanides

small decrease in standard electrode potential value of lanthanides

Solution

Question 10

Lanthanide metal ions are mostly coloured

Lanthanides have high melting and boiling points

Lanthanides have low densities

Lanthanides have high ionisation energy

Solution

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[Xe] 4f⁷ 5d¹ 6s²

[Xe] 4f⁶ 5d² 6s²

[Xe] 4f⁸ 6d²

[Xe] 4f⁹ 5s¹