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Test: F-Block elements - JEE MCQ


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15 Questions MCQ Test Chemistry for JEE Main & Advanced - Test: F-Block elements

Test: F-Block elements for JEE 2025 is part of Chemistry for JEE Main & Advanced preparation. The Test: F-Block elements questions and answers have been prepared according to the JEE exam syllabus.The Test: F-Block elements MCQs are made for JEE 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: F-Block elements below.
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Test: F-Block elements - Question 1
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The most basic hydroxide among the following is

Detailed Solution for Test: F-Block elements - 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 for Test: F-Block elements - 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

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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
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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 for Test: F-Block elements - 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
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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?
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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 for Test: F-Block elements - 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
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Lanthanum is the first element of lanthanide series so size decreases with increase in atomic number so La has the largest atomic radi.

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Lanthanum is gouped with block elements because
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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?
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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?
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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?
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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 for Test: F-Block elements - 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 for Test: F-Block elements - Question 15
Lanthanides have configuration of
So their trivalent ion have configuration of to
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