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JEE Exam  >  JEE Test  >  Chemistry Main & Advanced  >  Test: F-Block elements - JEE MCQ

F-Block elements - Free MCQ Practice Test with solutions, JEE Chemistry


MCQ Practice Test & Solutions: Test: F-Block elements (15 Questions)

You can prepare effectively for JEE Chemistry for JEE Main & Advanced with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: F-Block elements". These 15 questions have been designed by the experts with the latest curriculum of JEE 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 20 minutes
  • - Number of Questions: 15

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Test: F-Block elements - Question 1
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The most basic hydroxide among the following is

Detailed Solution: Question 1

Basicity is a measure of the ease at which an atom will lose electron. For the lanthanides, the basicity decreases as the atomic number increases.

The order of the basicity for the lanthanides are

and also is less stable than and thus it will readily accept convert into and so it will less basic than .

Hence, from all above observations it can be concluded that is most basic among all given options.

Test: F-Block elements - Question 2
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Statement I : Many trivalent lanthanide ions are coloured both in solid state and in aqueous solution.

Statement II : Colour of these ions is due to the presence of f-electrons.

Detailed Solution: Question 2

Many trivalent lanthanide ions are coloured due to the presence of f-electrons, in solid state as well as in aqueous solutions.

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Test: F-Block elements - Question 3
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The number f-electrons in +3 oxidation state of gadolinium is and in +2 oxidation state of Ytterbium is . The sum of and is

Detailed Solution: Question 3

The outer electronic configuration for and are:-

Test: F-Block elements - Question 4
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The number of unpaired electrons in Gadolinium is

Detailed Solution: Question 4


No. of unpaired electrons

Test: F-Block elements - Question 5
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Which one of the following elements shows maximum number of different oxidation states in its compounds?

Detailed Solution: Question 5

We know that lanthanides La, Gd shows , oxidation state, while Eu shows oxidation state of and . Am shows , and oxidation states. Therefore Americium (Am) has maximum number of oxidation states.

Test: F-Block elements - Question 6
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The electronic configuration of gadolinium (At. No. 64) is

Detailed Solution: Question 6

Electronic configuration of gadolinium is

Test: F-Block elements - Question 7
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Which of the following pairs is expected to form colourless compound?

Detailed Solution: Question 7

The configurations of is (4f)" while that of is . They are expected to be colomicis.

Test: F-Block elements - Question 8
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Gadolinium (atomic number = 64) is a member of 4f series. It's electronic configuration in +3 oxidation state is [Xe] 4f7. What is the ground state electronic configuration of gadolinium?

Detailed Solution: Question 8

The atomic number of gadolinium is 64 . Electronic configuration is [Xe]

Test: F-Block elements - Question 9
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Which of the following trivalent ion has the largest atomic radii in the lanthanide series

Detailed Solution: Question 9

Lanthanum is the first element of lanthanide series so size decreases with increase in atomic number so La has the largest atomic radi.

Test: F-Block elements - Question 10
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Lanthanum is gouped with block elements because

Detailed Solution: Question 10

It has partially filled f-orbitals. because, forbitals of electron shell are filled with " ". and deu to electronic configuration.

Test: F-Block elements - Question 11
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Which element among the lanthandes has the smallest atomic radius?

Detailed Solution: Question 11

Lutetium is the last element of lanthanides. Due to lanthanide contraction it has the smallest size.

Test: F-Block elements - Question 12
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Which of the following can act as oxidising agent?

Detailed Solution: Question 12

Ce has tendency to go over to and hence acts as oxidiring agent.

Test: F-Block elements - Question 13
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Which of the following species has maximum tendency to form complexes?

Detailed Solution: Question 13

being smallest (due to lanthanide contraction) has maximum tendency to form complexes.

Test: F-Block elements - Question 14
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From the list given below, the number of lanthanides which exhibit +4 state in their oxides is Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy

Detailed Solution: Question 14

Pr, Nd, Tb and Dy exhibit +4 state in their oxides as they acquire configurations closer to stable 4f∘ and 4f7 configurations.

Test: F-Block elements - Question 15
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(trivalent lanthanides ions) have E.C.

Detailed Solution: Question 15

Lanthanides have configuration of
So their trivalent ion have configuration of to

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About this JEE Practice Test

This test contains 15 MCQs on F-Block elements with detailed solutions for each question. It is part of the Chemistry for JEE Main & Advanced course on EduRev, designed to align with the current JEE syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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