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Test: Properties of D-block elements - JEE MCQ


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20 Questions MCQ Test Chemistry for JEE Main & Advanced - Test: Properties of D-block elements

Test: Properties of D-block elements for JEE 2024 is part of Chemistry for JEE Main & Advanced preparation. The Test: Properties of D-block elements questions and answers have been prepared according to the JEE exam syllabus.The Test: Properties of D-block elements MCQs are made for JEE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Properties of D-block elements below.
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Test: Properties of D-block elements - Question 1

Which of the following is not a condition for complex formation?

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Tendency of an element to form complexes does not depend on whether the element shows variable O.S. or not

Test: Properties of D-block elements - Question 2

Which one of the following is a diamagnetic ion?

Detailed Solution for Test: Properties of D-block elements - Question 2

Co+2 = [Ar] 3d7
Cu2+ = [Ar] 3d9
Mn+2 = [Ar] 3d5
Sc+3 = [Ar]
We can see that only Sc+3  has no unpaired electron, so it is a diamagnetic ion.

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Test: Properties of D-block elements - Question 3

 The inner transition elements are the elements in which the added electrons go to:

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The inner transition elements are the elements in which the added electrons go to (n-2) f-orbitals. These include lanthanoids and actinoids. In lanthanoids, the added electron goes to 4f orbital and in actinoids, the added electron goes to 5f orbital.

Test: Properties of D-block elements - Question 4

Which of the following pairs of ions are colourless?

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Both of these ions have no unpaired electron, hence these are colourless.

Test: Properties of D-block elements - Question 5

Which of the following is not correct about transition metals?

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Transition metals exhibit variable valency.

Test: Properties of D-block elements - Question 6

Zinc and mercury do not show variable valency like -block element because

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and have -shells completely filled hence they do not exhibit variable valency.

Test: Properties of D-block elements - Question 7

Which one of the following is diamagnetic ion?

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is diamagnetic as it does not contain any unpaired electron while others contain.

Test: Properties of D-block elements - Question 8

Which group contains coloured ions out of
1. Cu2+
2. Ti4+
3. Co2+
4. Fe2+

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are coloured ions
hence the answer is .

Test: Properties of D-block elements - Question 9

A compound of a metal ion has a spin only magnetic moment of Bohr Magnetons. The number of unpaired electrons in the compound are

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Magnetic moment where number of unpaired electrons

Test: Properties of D-block elements - Question 10

Cuprous ion is colourless while cupric ion is coloured because

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In there is no unpaired electron, contains one unpaired electron hence coloured.

Test: Properties of D-block elements - Question 11
Among the following, the compound that is both paramagnetic and coloured, is
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is both paramagnetic and coloured.
Test: Properties of D-block elements - Question 12
Mercury is the only metal which is liquid at . This is due to its
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Metallic bonding in mercury is weak.
Test: Properties of D-block elements - Question 13
Which of the following pair of ions have same paramagnetic moment?
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Both of these ions have one unpaired electron, hence these have same paramagnetic moment.
Test: Properties of D-block elements - Question 14
The correct order of decreasing second ionisation enthalpy of Ti (22), V (23), Cr (24) and Mn (25) is-
Detailed Solution for Test: Properties of D-block elements - Question 14
Electronic configuration of the given elements are




In general, ionization potential ( both 1st and 2nd ) increases form left to right across the period due to increase in effective nuclear charge. On this basis, the second IP values should exhibit the trend :
Mn > Cr > V > Ti
But the actual observed order is :
Cr > Mn > V > Ti
Practically, only chromium is exceptional and rest others show the normal trend. This exceptional behaviour of chromium is due to the stable configuration ( 3d5 ) that it achieves after the loss of first electron.
Test: Properties of D-block elements - Question 15
Which pair of ions have same magnetic moment?
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magnetic moment as 3.87
magnetic moment as 3.87
Test: Properties of D-block elements - Question 16

The correct statement about Cr2+ and Mn3+ among the following is (Given, atomic numbers of Cr = 24 and Mn = 25)

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Test: Properties of D-block elements - Question 17
A transition element containing only one electron in 4s-orbital is:
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has the electronic structure of . One electron moves from the 45 -orbital to attain a more stable state with completely filled orbital.
Test: Properties of D-block elements - Question 18
Which of the following characteristics of the transition metals is associated with their catalytic activity?
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Catalytic activity of transition elements is due to their variable oxidation states and to form complexes
Test: Properties of D-block elements - Question 19
How many unpaired electrons will be present in the ground state of an atom which has valence electronic configuration in its +3 oxidation state?
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Ground state electronic configuration of the element ( will be .

Test: Properties of D-block elements - Question 20
Which of the following is the common oxidation state for 'transition' elements?
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Transition metals commonly exhibit +2 oxidation state because only two electrons can exist in an -orbital, and removing the electrons from the sub shell below it requires immense amounts of energy, this limits them to a +2 charge most of the time. Hence, the correct option is (c).
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