Properties of d-Block Elements, Class 12 Chemistry NCERT Solutions

1. There will be total 20 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
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1. Which of the following point is not true about enthalpy of atomization regarding transition metals?

Transition metals of the second and third series have greater enthalpies of atomisation than the corresponding elements of the first series.

Metals with very high enthalpy of atomisation tend to be noble in their reactions.

They have high enthalpies of atomization

Transition metals of the second and third series have lower enthalpies of atomisation than the corresponding elements of the first series.

Question 1 of 20

2. Lanthanoid contraction is observed in:

s-block elements

p- block elements

d- block elements

f- block elements

Question 2 of 20

3. Which of the following ions is colourless?

Sc³⁺

V³⁺

Fe²⁺

Cr³⁺

Question 3 of 20

4. Lanthanoid contraction is due to increase in:

Size of 4f orbital

Shielding by 3f electrons

Atomic number

Effective nuclear charge

Question 4 of 20

5. Which of the following elements shows +7 oxidation state?

Question 5 of 20

6. Which of the following fact is true ?

Shielding effect of d- electrons is equal to that of f- electron.

f-electrons and d-electrons do not involve in shielding.

Shielding effect of d- electrons is greater than that of f- electron.

Shielding effect of f- electrons is greater than that of d- electron.

Question 6 of 20

7. The oxidation state of Mn in Mn₂O₃ is:

Question 7 of 20

8. Which transition element does not exhibit variable oxidation states?

Question 8 of 20

9. Which of the following ion does not form coloured solutions?

Zn²⁺

Cr³⁺

Mn³⁺

V³⁺

Question 9 of 20

10. Formation of coloured ions is possible when the metal contains:

Unpaired electrons

Shielded electrons

Lone pairs of electrons

Paired electrons

Question 10 of 20

11. In compounds of higher oxidation states in transition metals the bonds formed are mostly:

Divalent

Electrovalent

Ionic

Covalent

Question 11 of 20

12. Among 3d transition series the ionization enthalpy:

Decreases regularly on moving from left to right

Remains constant within the period

Increases gradually within period but relative increase is not sharp.

Increases regularly on moving from left to right

Question 12 of 20

13. d-block elements form coloured ions because:

They absorb some energy for d-d transition.

They absorb some energy for d-s transition.

They absorb some energy for p-d transition.

They do not absorb any energy.

Question 13 of 20

14. The first ionization energy of the d-block elements are:

Lesser than p-block elements

Between s and p-block elements

Lesser than s-block elements

Higher than p-block elements

Question 14 of 20

15. Which of the following ions should have highest magnetic moment?

Zn²⁺

Cu²⁺

Fe²⁺

Fe³⁺

Question 15 of 20

16. Colour of [Ti(H₂O)₆]³⁺ ion is due to:

Interatomic transfer of electrons

Presence of water molecules

Inner transition elements

Excitation of electron from d (eta)to d (gamma )orbital

Question 16 of 20

17. The density of elements of 3d series across a period:

Remain constant throughout

Decreases from left to right across a period

Increases from left to right across a period

First increases then decreases

Question 17 of 20

18. Which of the following ion does not show violet colour?

Mn³⁺

Zn²⁺

Cr³⁺

V²⁺

Question 18 of 20

19. The most common oxidation state of the first row transition metal is:

Question 19 of 20

20. Which of the following factor does not affect the atomic size of d block elements?

Electrostatic attraction between nucleus and outermost electrons.

Number of protons in nucleus

Number of shielding electrons

Number of neutrons in nucleus

Question 20 of 20