The p-Block Elements MCQs Mock Test of Class 12th Chemistry

Welcome to your The p-Block Elements MCQs Mock Test of Class 12th Chemistry

1.

Question 1. The hybridisation of sulphur in sulphur hexafluoride is

(a) sp3d

(b) sp3d2

(c) sp3d3

(d) sp3

2.

Question 2. On heating KCIO, we get

(a) KClO2 + O2

(b) KCl + O2

(c) KCI + O3

(d) KCl + O2 + O3

3.

Question 3. Which of the following is not correctly matched?

(a) Acidic oxides-P2O5 NO2, CL2O7

(b) Basic oxides-Na2Om, CaO, MgO

(c) Neutral oxides-CO2, CO, BeO

(d) Amphoteric oxides-ZnO, SnO,Al2O3

4.

Question 4. 18 H2S is more acidic than H2O because

(a) oxygen is more electronegative than sulphur.

(b) atomic number of sulphur is higher than oxygen.

(c) H — S bond dissociation energy is less as compared to H — O bond.

(d) H — O bond dissociation energy is less also compared to H — S bond.

5.

Question 5. Among the 15th group elements, as we move from nitrogen to bismuth, the pentavalency becomes less pronounced and trivalency becomes more pronounced due to

(a) Non metallic character

(b) Inert pair effect

(c) High electronegativity

(d) Large ionization energy

6.

Question 6. Which of the following statements is not correct for nitrogen?

(a) Its electronegativity is very high

(b) d-orbitals are available for bonding

(c) It is a typical non-metal

(d) Its molecular size is small

7.

Question 7. Collectively the elements of group 15 are called –

(a) pnicogens

(b) pnicopens

(c) nicopen

(d) None of these

8.

Question 8. Ionic radii (in Å) of As3+, Sb3+ and Bi3+ follow the order

(a) As3+ > Sb3+ > Bi3+

(b) Sb3+ > Bi3+ >As3+

(c) Bi3+ > As3+ > Sb3+

(d) Bi3+ > Sb3+ > As3+

9.

Question 9. Which one of the following elements is most metallic ?

(a) P

(b) As

(c) Sb

(d) Bi

10.

Question 10. Which of the follow group 15 element forms metallic bonds in elemental state ?

(a) As

(b) P

(c) Sb

(d) Bi

11.

Question 11. The three important oxidation states of phosphorus are

(a) –3, +3 and +5

(b) –3, +3 and –5

(c) –3, +3 and +2

(d) –3, +3 and +4

12.

Question 12. Which of the following statement is incorrect for group 15 elements ?

(a) Order of ionization enthalpies is ΔiH1 < ΔiH2 < ΔiH3

(b) The boiling point and melting point increases from top to bottom in the group

(c) Dinitrogen is a gas while all others are solids

(d) All statements are correct

13.

Question 13. Nitrogen is relatively inactive element because

(a) its atom has a stable electronic configuration

(b) it has low atomic radius

(c) its electronegativity is fairly high

(d) dissociation energy of its molecule is fairly high

14.

Question 14. Which of the following has the highest pπ – pπ bonding tendency ?

(a) N

(b) P

(c) As

(d) Sb

15.

Question 15. Pick out the wrong statement.

(a) Nitrogen has the ability to form pπ-pπ bonds with itself.

(b) Bismuth forms metallic bonds in elemental state.

(c) Catenation tendency is higher in nitrogen when compared with other elements of the same group.

(d) Nitrogen has higher first ionisation enthalpy when compared with other elements of the same group.

16.

Question 16. Nitrogen forms N2, but phosphorus is converted into P4 from P, the reason is

(a) Triple bond is present between phosphorus atom

(b) pπ – pπ bonding is strong

(c) pπ – pπ bonding is weak

(d) Multiple bond is formed easily

17.

Question 17. What causes nitrogen to be chemically inert ?

(a) Multiple bond formation in the molecule

(b) Absence of bond polarity

(c) Short internuclear distance

(d) High bond energy

18.

Question 18. Pentavalence in phosphorus is more stable when compared to that of nitrogen even though they belong to same group. This is due to

(a) dissimilar electronic configuration

(b) due to presence of vacant d-orbitals

(c) reactivity of phosphorus

(d) inert nature of nitrogen

19.

Question 19. Which one has the lowest boiling point ?

(a) NH3

(b) PH3

(c) AsH3

(d) SbH3

20.

Question 20. Boron shows diagonal relation with

(a) Al

(b) C

(c) Si

(d) Sn

21.

Question 21. Catenation property is maximum in

(a) phosphorus

(b) carbon

(c) sulphur

(d) zinc

22.

Question 22. Which one of the following is an electrophilic reagent?

(a) BF3

(b) KH3

(c) H2O

(d) None of these

23.

Question23. Element found from sea water is

(a) magnesium

(b) Sodium

(c) Iodine

(d) None of these

24.

Question 24. The shape of XeF4 is

(a) tetrahedral

(b) square planar

(c) pyramidal

(d) linear

25.

Question 25. Which one of the following is the strongest lewis acid?

(a) BF3

(b) BCl3

(c) BBr3

(d) Bl3

26.

Question 26. Which one of the following does not form hydrogen bonding?

(a) NH3

(b) H2O

(c) HCl

(d) HF

27.

Question 27. Main source of helium is

(a) Air

(b) Radium

(c) Monazite

(d) Water

28.

Question 28. Which one of the following dement is liquid at normal temperature?

(a) zinc

(b) mercury

(c) bromine

(d) water

29.

Question 29. Which one of the following is least basic?

(a) NCl3

(b) NBr3

(c) NI3

(d) NF3

30.

Question 30. H2SO4 is a/an

(a) acid

(b) base

(c) alkali

(d) salt

31.

Question 31. Modern periodic table is given by

(a) Debonair

(b) Mendeleef

(c) Mendel

(d) None of these

32.

Question 32. Which one of the following elements is found in free state in nature?

(a) Sodium

(b) Iron

(c) Zinc

(d) Gold

33.

Question 33. Which of the following is the strongest oxidising agent?

(a) F2

(b) Cl2

(c) l2

(d) Br2

34.

Question 34. Which of the following has maximum ionisation potential?

(a) Al

(b) P

(c) Si

(d) Mg

35.

Question 35. The number of P-O-P bonds in cyclic metaphosphoric acid is

(a) 2

(b) 0

(c) 3

(d) 4

36.

Question 36 Which of the following oxides is an hydride of nitrous acid ?

(a) N2O3

(b) NO2

(c) NO

(d) N2O4

37.

Question 37. Which oxide of nitrogen is obtained on heating ammonium nitrate at 250°C ?

(a) Nitric oxide

(b) Nitrous oxide

(c) Nitrogen dioxide

(d) Dinitrogen tetraoxide

38.

Question 38. Atomicity of phosphorus is

(a) 1

(b) 2

(c) 3

(d) 4

39.

Question 39. The structure of white phosphorus is

(a) square-planar

(b) pyramidal

(c) tetrahedral

(d) trigonal planar

40.

Question 40. PCl3 on hydrolysis gives

(a) H3PO3

(b) HPO3

(c) H3PO4

(d) POCl3

41.

Question41. Arrange the following in decreasing Lewis acid strength -PF3, PCI3, PBr3, Pl3

(a) Pl3 > PBr3 > PCl3 > PF3

(b) PF3 > PCl3 > PBr3 > Pl3

(c) PCl3 > PBr3 > Pl3 > PF3

(d) PBr3 > Pl3 > PF3 > PCl3

42.

Question 42. How many P-O-P bonds appear in cyclic meta-phosphoric acid?

(a) 4

(b) 3

(c) 2

(d) 1

43.

Question 43. Which of the following is a tetrabasic acid?

(a) Hypophosphorus acid

(b) Metaphosphoric acid

(c) Pyrophosphoric acid

(d) Orthophosphoric acid

44.

Question 44. Which of the following is not correctly matched?

(a) PCl5-sp3d hybridisation

(b) PCl3-sp3 hybridisation

(c) PCl5 (solid)-[PtCl4]– [PtCl3]–

(d) H3PO3 -tribasic

45.

Question 45. Arrange the following hydrides of group 16 elements in order of increasing stability

(a) H2S H2Se

(b) H2O < H2Te < H2Se < H2S

(c) H2O < H2S < H2Se < H2Te

(d) H2Te < H2Se < H2S < H3O

46.

Question 46 The boiling points of hydrides of group 16 are in the order

(a) H2O > H2Te > H2S > H2Se

(b) H2O > H2S > H2Se > H2Te

(c) H2O > H2Te > H2Se > H2S

(d) None of these

47.

Question 47 In the manufacture of sulphuric acid by contact process Tyndall box is used to

(a) convert SO2 and SO3

(b) test the presence of dust particles

(c) filter dust particles

(d) remove impurities

48.

Question 48 Fluorine differs from rest of the halogens in some of its properties. This is due to

(a) its smaller size and high electronegativity.

(b) lack of d-orbitals.

(c) low bond dissociation energy.

(d) All of the these.

49.

Question 49 Boron shows diagonal relation with

(a) Al

(b) C

(c) Si

(d) Sn

50.

Question 50. Catenation property is maximum in

(a) phosphorus

(b) carbon

(c) sulphur

(d) zinc

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