1. The most common oxidation state of lanthanoids is

(a) +4

(b) +3

(c) +6

(d) +2

2. Which of the following elements belong to actinoid series?

(a) Cerium

(b) Lutetium

(c) Thorium

(d) Lanthanum

3. Which element among the lanthanoids has the smallest atomic radius?

(a) Cerium

(b) Lutetium

(c) Europium

(d) Gadolinium

4. The properties of \(\mathrm{Zr}\) and \(\mathrm{Hf}\) are similar because

(a) both have same atomic radii

(b) both belong to d block

(c) both belong to same series

(d) both have same number of electrons

5. Lanthanoids are placed in

(a) \(3^{\text {rd }}\) group and \(7^{\text {th }}\) period

(b) \(3^{\text {nd }}\) group and \(6^{\text {th }}\) period

(c) \(4^{\text {th }}\) group and \(7^{\text {th }}\) period

(d) \(3^{\text {rd }}\) group and \(5^{\text {th }}\) period

6. The general electronic configuration \([R n] 5 f^{1-14} 6 d^{0-1} 7 s^2\) is of the

(a) Lanthanoids

(b) Actinoids

(c) s-block elements

(d) d-block elements

7. The general electronic configuration of transition element is

(a) \((\mathrm{n}-1) \mathrm{d}^{1-10}\)

(b) (n-1) \(\mathrm{d}^{10} \mathrm{~ns}^2\)

(c) \((\mathrm{n}-1)^{1-10} \mathrm{~ns}^{1-2}\)

(d) (n-1) \(d^5 n s^1\)

8. An atom with atomic number 21 belongs to category of

(a) S-block elements

(b) P-block elements

(c) d-block elements

(d) f-block elements

9. The first transition element is

(a) Chromium

(b) Scandium

(c) Nickel

(d) Copper

10. Which one of the following has largest radii?

(a) \(\mathrm{Cr}^{3+}\)

(b) \(\mathrm{Mn}^{3+}\)

(c) \(\mathrm{Fe}^{3+}\)

(d) \(\mathrm{Co}^{3+}\)

11. Chromium ( \(Z=24)\) has clectronic configuration

(a) \([\mathrm{Ar}] 4 \mathrm{~d}^4 4 \mathrm{~s}^2\)

(b) \([\mathrm{Ar}] 4 \mathrm{~d}^5 4 \mathrm{~s}^1\)

(c) \([\mathrm{Ar}] 3 \mathrm{~d}^5 3 \mathrm{~s}^1\)

(d) \([\mathrm{Ar}] 3 \mathrm{~d}^5 4 \mathrm{~s}^1\)

12. The number of delectrons retained in \(\mathrm{Fe}^{2+}\) \((\mathrm{Z}\) of \(\mathrm{Fe}=26)\) ion is

(a) 3

(b) 4

(c) 5

(d) 6

13. Manganese achieves the highest oxidation state in its compounds

(a) \(\mathrm{Mn}_3 \mathrm{O}_4\)

(b) \(\mathrm{KMnO}_4\)

(c) \(\mathrm{K}_2 \mathrm{MnO}_4\)

(d) \(\mathrm{MnO}_2\)

14. Which one of the following element forms interstitial compounds?

(a) Fe

(b) \(\mathrm{Co}\)

(c) \(\mathrm{Ni}\)

(d) \(\mathrm{Sc}\)

15. Equivalent mass of \(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\) in acidic solution is

(a) molecular mass/2

(b) molecular mass/4

(c) molecular mass/l

(d) molecular mass/6

16. The group which belongs to transition series is

(a) 2

(b) 7

(c) 13

(d) 15

17. Which of the following compounds is expected to be coloured?

(a) \(\mathrm{AgNO}_3\)

(b) \(\mathrm{CuSO}_4\)

(c) \(\mathrm{ZnCl}_2\)

(d) \(\mathrm{CuCl}\)

18. Chromyl chloride test is for

(a) Chloride salt

(b) nitrate salt

(c) thiosulphate salt .

(d) sulphate salt

19. The product of 0 xidation of \(\mathrm{I}^{-}\)with \(\mathrm{MnO}_4^{-}\)ions in alkaline medium is

(a) \(\mathrm{I}_2\)

(b) \(\mathrm{IO}^{-}\)

(c) \(\mathrm{IO}_4^{-}\)

(d) \(\mathrm{IO}_3^{-}\)

20. The metal ion which is NOT coloured, is

(a) \(\mathrm{Fe}^3\)

(b) \(\mathrm{V}^2\)

(c) \(7 n^{2+}\)

(d) \(\mathrm{Ti}^{3+}\)

21. A gas when passed through the \(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\) and dil. \(\mathrm{H}_2 \mathrm{SO}_4\) solution; turns it green, the gas is

(a) \(\mathrm{H}_2 \mathrm{~S}\)

(b) \(\mathrm{NH}_3\)

(c) \(\mathrm{Cl}_2\)

(d) \(\mathrm{SO}_2\)

22. Transition metals and their oxides are used in processes of industries as

(a) Insecticides

(b) medicines

(c) detergents

(d) catalysts

23. Acidified potassium dichromate can NOT oxidize

(a) Ethanol

(b) Potassium iodide

(c) Ferric sulphate

(d) Hydrogen sulphide

24. The number of moles of \(\mathrm{KMnO}_4\) that will be required to react with one mole of sulphide ion in acidic medium is

(a) \(2 / 5\)

(b) \(3 / 5\)

(c) \(4 / 5\)

(d) \(5 / 5\)

25. The species with an atom in +6 oxidation state is

(a) \(\mathrm{MnO}_4^{-}\)

(b) \(\operatorname{Cr}(\mathrm{CN})_6^{3-}\)

(c) \(\mathrm{NiF}_6^{2-}\)

(d) \(\mathrm{CrO}_2 \mathrm{Cl}_2\)

26. If carbon is added to iron to prepare interstitial compound then the iron becomes

(a) Less tensile

(b) softer

(c) Less malleable

(d) more ductile

27. When conc. \(\mathrm{H}_2 \mathrm{SO}_4\) is added to \(\mathrm{KMnO}_4\) explosion occurs. The compound formed is

(a) \(\mathrm{MnSO}_4\)

(b) \(\mathrm{MnO}_5\)

(c) \(\mathrm{Mn}_2 \mathrm{O}_3\)

(d) \(\mathrm{Mn}_2 \mathrm{O}^3\)

28. Highest magnetic moment is shown by the ion

(a) \(\mathrm{V}^{3+}\)

(b) \(\mathrm{Co}^{3+}\)

(c) \(\mathrm{Fe}^{3+}\)

(d) \(\mathrm{Cr}^{3+}\)

29. Transition elements show negative oxidation states only in

(a) Complexes

(b) sulphides

(c) halides

(d) sulphates

30. The equation

\( $$ 3 \mathrm{MnO}_4^{-}+4 \mathrm{H}^{+} \rightarrow 2 \mathrm{MnO}_4^{-}+\mathrm{MnO}_2+2 \mathrm{H}_2 \mathrm{O} $$ \)

represents

(a) reduction

(b) disproportionation

(c) oxidation in acidic medium

(d) reduction in acidic medium.

31. Magnetic moment of \(\mathrm{Ce}^{3+}\) ion on the basis of 'spin-only' formula will be B.M.

(a) 1.232

(b) \(\overline{1} .332\)

(c) 1.532

(d) 1.732

32. Highest \((+7)\) oxidation state is shown by

(a) \(\mathrm{Co}\)

(b) Cr

(c) V

(d) \(\mathrm{Mn}\)

33. Which is heaviest among the following.

(a) Iron

(b) Copper

(c) Gold

(d) Silver

34. Which of the following compounds is not coloured?

(a) \(\mathrm{Na}_2\left[\mathrm{CuCl}_4\right]\)

(b) \(\mathrm{Na}_2\left[\mathrm{CdCl}_4\right]\)

(c) \(\mathrm{K}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]\)

(d) \(\mathrm{K}_3\left(\mathrm{Fe}\left(\mathrm{CN}_6\right)\right]\)

35. The element with an atomic number 26 is

(a) A non-metal

(b) Krypton

(c) Iron

(d) Manganese

36. \(\mathrm{Fe}^{3+}\) compounds are more stable than \(\mathrm{Fe}^{2+}\) compounds because

(a) \(\mathrm{Fe}^{3+}\) has smaller size than \(\mathrm{Fe}^{2+}\)

(b) \(\mathrm{Fe}^{3+}\) has \(3 \mathrm{~d}^5\) configuration (half-filled)

(c) \(\mathrm{Fe}^{3+}\) has higher oxidation state

(d) \(\mathrm{Fe}^{3+}\) is paramagnetic in nature

37. What happens when potassium iodide reacts with acidic solution of potassium dichromate?

(a) It liberates iodine.

(b) Potassium sulphate is formed.

(c) Chromium sulphate is formed.

(d) All the above products are formed.

38. Transition metals make the most efficient catalysts because of their ability to

(a) adopt multiple oxidation states and to form complexes

(b) form coloured ions

(c) show paramagnetism due to unpaired electrons

(d) form a large number of oxides.

39. The salts of \(\mathrm{Cu}\) in +1 oxidation state are unstable because

(a) \(\mathrm{Cu}^{+}\)has \(3 \mathrm{~d}^{10}\) configuration

(b) \(\mathrm{Cu}^{+}\)disproportionates easily to \(\mathrm{Cu}(\mathrm{O})\) and \(\mathrm{Cu}^{2+}\)

(c) \(\mathrm{Cu}^{+}\)disproportionates easily to \(\mathrm{Cu}^{2+}\) and \(\mathrm{Cu}^{3+}\)

(d) \(\mathrm{Cu}^{+}\)is easily reduced to \(\mathrm{Cu}^{2+}\).

40. The second and third row elements of transition metals resemble each other much more than they resemble the first row because of

(a) Lanthanoid contraction which results in almost same radii of second and third row metals

(b) diagonal relationship between second and third row elements

(c) similar ionisation enthalpy of second and third row elements

(d) similar oxidation states of second and third row metals.

41. Which of the following is not correctly matched with the given example?

(a) An element of first transition series which has highest second ionisation enthalpy-Cu

(b) An element of first transition series with highest third ionisation enthalpy- \(Z \mathrm{n}\)

(c) An element of first transition series with lowest enthalpy of atomisation- Zn

(d) Last element of third transition series-Cd

42. Which of the following statements concerning lanthanide elements is false?

(a) All lanthanides are highly dense metals.

(b) More characteristic oxidation state of lanthanide elements is +3 .

(c) Lanthanides are separated from one another by ion exchange method.

(d) Ionic radii of trivalent lanthanides steadily increases with increase in the atomic number.

43. Transitional elements are named transition elements because their characters are

(a) In between \(s\) and p-block elements

(b) Like that of \(p\) and \(d\)-block elements

(c) They are members of I.A. group

(d) They are like inactive elements

44. Colour of transition metal ions are due to absorption of some wavelength. This results in

(a) d-s transition

(b) s-s transition

(c) s-dtransition

(d) d-d transition.

45. Which of the following statements is not correct?

(a) Copper liberates hydrogen from acids.

(b) In higher oxidation states, manganese forms stable compounds with oxygen and fluorine.

(c) \(\mathrm{Mn}^ {3+}\) and \(\mathrm{CO}^{3+}\) are oxidising agents in aqueous solution.

(d) \(\mathrm{Ti}^{2+}\) and \(\mathrm{Cr}^{2+}\) are reducing agents in aqueous solution.

46. Which of the following statements is not true in regard to transition elements.

(a) They readily form complex compounds

(b) They show variable valency

(c) All their ions are colourless

(d) Their ions contain partially filled d-elelctron levels

47. Potassium dichromate is prepared from

(a) chromate obtained by the fusion of chromite ore

with sodium carbonate in free access of air

(b) pyrolusite which is fused with potassium hydroxide in the presence of air

(c) iron pyrite by the fusion with potassium carbonate in presence of moisture

(d) none of these.

48. A transition element \(\mathrm{X}\) has a configuration \(\left[\mathrm{Ar} \mid 3 \mathrm{~d}^4\right.\) in its +3 oxidation state. Its atomic number is

(a) 25

(b) 26

(c) 22

(d) 19

49. What is the total number of inner transition elements in the periodic table?

(a) 10

(b) 14

(c) 30

(d) 28

50. Transition metals are related to which block.

(a) s-block

(b) p-block

(c) d-block

(d) None of these