MDCAT XII Chemistry D and F Block Online Test-2

Test Details:

Subject: Chemistry
Class: 2nd year or 12
Chapter Name: D and F Block
Test: 2
Book: Sindh Textbook
Total No. Of MCQS: 50 MCQS
Time Allowed: 50 Minutes
Price: Free

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Created on May 27, 2025 By

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MDCAT XII Chemistry D and F Block Online Test-2

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NameEmailPhone Number

1 / 50

1. The number of unpaired electrons in gaseous species of Mn³⁺, Cr³⁺, and V³⁺ respectively are:

a) 4, 4, and 2

b) 3, 3, and 2

c) 4, 3, and 2

d) 3, 3, and 3

2 / 50

2. Zinc and mercury do not show variable valency like d-block elements because:

a) They are soft

b) Their d-shells are complete

c) They have only two electrons in the outermost subshell

d) Their d-shells are incomplete

3 / 50

3. In the reaction Cu + 2H₂SO₄ → CuSO₄ + SO₂ + 2H₂O, H₂SO₄ acts as:

a) Reducing agent

b) Oxidizing agent

c) Catalytic agent

d) All of these

4 / 50

4. Oleum is the combination of H₂SO₄ with:

a) SO₃

b) SO₂

c) SO₄

d) SO

5 / 50

5. Catalyst required during the process of oxidation of SO₂ is:

a) Fe

b) V₂O₅

c) No catalyst in that reaction

d) MnO₂

6 / 50

6. Formula of starch is:

a) C₆H₁₀O₆

b) C₆H₁₀O₅

c) C₆H₁₀O₄

d) None of these

7 / 50

7. When chlorine gas is added to heated NaOH, the main product is:

a) NaClO

b) NaClO₂

c) NaClO₃

d) None of these

8 / 50

8. For which one of the following properties of halogens does the sequence F > Cl > Br > I hold good?

a) Electron affinity

b) Electronegativity

c) Atomic radius

d) Boiling point

9 / 50

9. Find the best option with the halide which does not impart color to them:

a) BeX₂, CaX₂

b) BeX₂, MgX

c) BeX₂, SrX₂

d) None of these

10 / 50

10. Tick the best reason why d-block elements show color combinations:

a) d-d transition of electrons

b) Paramagnetic nature of transition elements

c) Ionization

d) Loss of s-electron

11 / 50

11. Non-typical element among the following:

a) Cr

b) Mn

c) Zn

d) Fe

12 / 50

12. If small energy is used and the compound can be broken, find that compound:

a) MgCO₃

b) Na₂CO₃

c) K₂CO₃

d) Rb₂CO₃

13 / 50

13. The electronic configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁹ represents:

a) Non-metal atom

b) Non-metallic anion

c) Metallic cation

d) Metal atom

14 / 50

14. Which of the following ionic species will impart color to an aqueous solution?

a) Ti⁴⁺

b) Cu⁺

c) Zn²⁺

d) Cr³⁺

15 / 50

15. General formula of transition elements:

a) (n–1)d¹⁻¹⁵

b) (n–1)d¹⁻¹⁰ ns¹

c) (n–1)d¹⁻¹⁰ ns¹⁻²

d) ns² (n–1)d¹⁰

16 / 50

16. We have found that d-block elements have excellent ability in catalytic activity. Why?

a) Variable oxidation states

b) High enthalpy of atomization

c) Paramagnetic behavior

d) Color of hydrated ions

17 / 50

17. Which molecules are held together by London dispersion forces?

a) NH₃

b) Air

c) BeX₂

d) None of these

18 / 50

18. Al is made passive by:

a) H₂SO₄

b) HCl

c) HNO₃

d) All of these

19 / 50

19. How many elements are there in monoclinic sulphur S₈?

a) 8

b) 2

c) 1

d) 4

20 / 50

20. Which of the following has the maximum magnetic moment?

a) V³⁺

b) Fe³⁺

c) Mn³⁺

d) Cu²⁺

21 / 50

21. Aamir found an element from the initial series of d-block. He got a clue that it has 6 unpaired electrons. Find that one:

a) Cr

b) Mn

c) V

d) Ni

22 / 50

22. Coinage non-metals are present in:

a) d-block

b) f-block

c) s-block

d) None of these

23 / 50

23. Oxidation number of [Pt(C₂O₄)₂]²⁺ is:

a) +2

b) +4

c) +1

d) -4

24 / 50

24. Which metal ion is paramagnetic?

a) V

b) Cu

c) Cu²⁺

d) Zn

25 / 50

25. Chromium possesses the same oxidation state in the pair of compounds:

a) K₂Cr₂O₇, K₂CrO₄

b) CrO₃, K₂Cr₂O₇

c) CrO₃, CrO₂Cl₂

d) All of these

26 / 50

26. Most stable oxidation state of iron is:

a) +3

b) +2

c) +6

d) +4

27 / 50

27. Denticity and charge of EDTA is:

a) Hexadentate and –1

b) Tetradentate and –2

c) Hexadentate and –4

d) Hexadentate and –6

28 / 50

28. KMnO₄ in basic medium is reduced to:

a) K₂MnO₄

b) MnO₂

c) Mn(OH)₄

d) Mn²⁺

29 / 50

29. Metal with the lowest melting point in the first transition series is:

a) Sc

b) Cr

c) Cu

d) Zn

30 / 50

30. Chelating ligands are:

a) Polydentate and neutral

b) Polydentate and negative

c) Bidentate and negative

d) Polydentate and neutral or negative

31 / 50

31. Which one is not an anionic ligand?

a) dmg

b) EDTA

c) Oxalate ion

d) None of these

32 / 50

32. IUPAC name for the complex compound Ag₂[NiI₄] is:

a) Disilvertetraiodonickelate(II)

b) Silver tetraiodonickel(0)

c) Silver tetraiodonickelate(0)

d) Silver tetraiodonickelate(II)

33 / 50

33. Compounds KMnO₄, K₂MnO₄, MnCl₂, MnO₂ can be arranged in increasing order of oxidation state of Mn as:

a) MnO₂, MnCl₂, KMnO₄, K₂MnO₄

b) MnCl₂, MnO₂, K₂MnO₄, KMnO₄

c) MnCl₂, MnO₂, KMnO₄, K₂MnO₄

d) MnO₄, K₂MnO₄, MnO₂, MnCl₂

34 / 50

34. Diethylene triamine is a _______ ligand:

a) Neutral and bidentate

b) Negative and bidentate

c) Neutral and tridentate

d) Negative and tridentate

35 / 50

35. Transition elements form colored compounds:

a) Due to small size

b) Due to metallic nature

c) Due to unpaired d-electrons

d) All of these

36 / 50

36. Corrosion is fastest in:

a) Iron

b) Sodium

c) Lead

d) Copper

37 / 50

37. The substances that are attracted by a magnetic field are called:

a) Diamagnetic

b) Paramagnetic

c) Ferromagnetic

d) None

38 / 50

38. The process of extracting metals like copper from its ore is called:

a) Metallurgy

b) Roasting

c) Bessemerization

d) Smelting

39 / 50

39. Properties of transition elements are transitional between:

a) Highly electropositive and highly electronegative elements

b) Least electronegative and most electronegative elements

c) Most electropositive and least electropositive elements

d) All of these

40 / 50

40. In the first series of transition elements:

a) Number of inner shell electrons remains the same

b) Number of valence shell electrons remains the same

c) Number of valence shell electrons is 2 except Cr and Cu

d) Number of inner shell electrons is 8

41 / 50

41. Correct order for ionization potential (I.P.) is:

a) s-block < d-block < p-block

b) s-block > d-block > p-block

c) s-block p-block

d) s-block > d-block < p-block

42 / 50

42. Heating a mixture of Cu₂O and Cu₂S will give:

a) Cu₂SO₃

b) CuO + CuS

c) Cu + SO₃

d) Cu + SO₂

43 / 50

43. What is the common oxidation state of elements in group 12 (Zn, Cd, Hg) of the d-block?

a) +1

b) +2

c) +3

d) +4

44 / 50

44. Which series of transition metals starts with Sc (Scandium) and ends with Zn (Zinc)?

a) 3d series

b) 4d series

c) 5d series

d) 6d series

45 / 50

45. Which of the following is a characteristic property of transition metals (d-block elements)?

a) They are all soft metals

b) They exhibit variable oxidation states

c) They are all noble gases

d) They are all highly electropositive

46 / 50

46. Which transition metal is used as a catalyst in the Haber process for the production of ammonia?

a) Iron (Fe)

b) Copper (Cu)

c) Nickel (Ni)

d) Platinum (Pt)

47 / 50

47. Which of the following is a property of transition metals?

a) They are all highly reactive

b) They form only ionic compounds

c) They exhibit catalytic activity

d) They are all radioactive

48 / 50

48. What is the reason for the color of transition metal compounds?

a) Presence of unpaired electrons in d-orbitals

b) Presence of paired electrons in d-orbitals

c) Presence of s-orbitals

d) Presence of p-orbitals

49 / 50

49. Which of the following transition metals is known for its high melting point and is used in filaments?

a) Copper (Cu)

b) Zinc (Zn)

c) Tungsten (W)

d) Mercury (Hg)

50 / 50

50. Which of the following transition metals is known for its ability to form carbonyl complexes?

a) Iron (Fe)

b) Copper (Cu)

c) Nickel (Ni)

d) All of the above

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MDCAT XII Chemistry D and F Block Online Test-2

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