7. THE P-BLOCK ELEMENTS Objective

7. THE P-BLOCK ELEMENTS

1. Boron shows diagonal relation with

(A) Al
(B) C
(C) Si
(D) Sn

2. Catenation property is maximum in

(A) phosphorus
(B) carbon
(C) sulphur
(D) zinc

3. Which one of the following is an electrophilic reagent ?

(A) BF₃
(B) NH₃
(C) H₂O
(D) None of these

4. Element found from sea water is

(A) Magnesium
(B) Sodium
(C) Iodine
(D) None of these

5. The shape of XeF ₄ is

(A) tetrahedral
(B) square planar
(C) pyramidal
(D) linear

6. Which one of the following is the strongest lewis acid ?

(A) BF₃
(B) BC1₃
(C) BBr₃
(D) BI₃

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

(A) NH₃
(B) H₂O
(C) HCl
(D) HF

8. Main source of helium is

(A) Air
(B) Radium
(C) Monazite
(D) Water

9. Which one of the following element is liquid at normal temperature ?

(A) zinc
(B) mercury
(C) bromine
(D) water

10. Which one of the following is least basic ?

(A) NCl₃
(B) NBr₃
(C) NI₃
(D) NF₃

11. H₂SO₄ is a/an

(A) acid
(B) base
(C) alkali
(D) salt

12. Modern periodic table is given by

(A) Debonair
(B) Mendeleef
(C) Mendel
(D) None of these

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

(A) Sodium
(B) Iron
(C) Zinc
(D) Gold

14. Which of the following is the strongest oxidising agent ?

(A) F₂
(B) Cl₂
(C) I₂
(D) Br₂

15. Which of the following has maximum ionisation potential ?

(A) Al
(B) P
(C) Si
(D) Mg

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

(A) 2
(B) O
(C) 3
(D) 4

17. Which of the following oxides is anhydride of nitrous acid ?

(A) N₂O₃
(B) NO₂
(C) NO
(D) N₂O₄

18. 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

19. Atomicity of phosphorus is

(A) 1
(B) 2
(C) 3
(D) 4

20. The structure of white phosphorus is

(A) square-planar
(B) pyramidal
(C) tetrahedral
(D) trigonal planar

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

(A) 4
(B) 3
(C) 2
(D) 1

22. Which of the following is a tetrabasic acid ?

(A) Hypophosphorus acid
(B) Metaphosphoric acid
(C) Pyrophosphoric acid
(D) Orthophosphoric acid

23. Which of the following is not correctly matched ?

(A) PCl₅-sp³d hybridisation
(B) PCl₃-sp³ hybridisation
(C) PCl₅ (solid)-[PtCl₄]⁺ [PtC₆l-
(D) H₃PO₃-tribasic

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

(A) H₂S < H₂O < H₂ Te > H₂ Se
(B) H₂O < H₂Te < H₂Se < H₂S
(C) H₂O < H₂S < H₂Se < H₂Te
(D) H₂Te < H₂Se < H₂S < H₂O

25. Which of the following is not tetrahedral in shape ?

(A) NH₄
(B) SiCl₄
(C) SF₄
(D) SO

26. Which of the following are peroxiacids of sulphur ?

(A) H₂SO₅ and H₂S₂O₈
(B) H₂SO₅ and H₂S₂O₇
(C) H₂S₂O₇ and H₂S₂O₈
(D) H₂S₂O₆ and H₂S₂O₈

27. In solid state PCl₅ is a

(A) covalent solid
(B) octahedral structure
(C) ionic solid with [PCl₆l⁺ octahedral and [PCl₄]^– tetrahedral
(D) ionic solid with [PCl₄]⁺ tetrahedral and [PCl₆]^– octahedral

28. Which of the following is an isoelectronic pair ?

(A) ICI₂, CIO₂
(B) Br₂^–, BrF₂⁺
(C) CIO₂, BrF
(D) CN^–, O₃

29. Which of the following is Tribasic ?

(A) H₃PO₂
(B) H₃PO₃
(C) H₄P₂O₇
(D) H₃PO₄

30. In white phosphorus (P4) molecule, which one is not correct ?

(A) 6 P-P single bonds are present
(B) 4 P-P single bonds are present
(C) 4 lone pair of electrons are present
(D) bond angle is 60°

31. Which is not a p-block elements ?

(A) Sn
(B) Al
(C) Mg
(D) Pb

32. H₂SO₂ is a/an

(A) acid
(B) base
(C) alkali
(D) all

33. What is the oxidation state of sulphur is SF₆ ?

(A) +6
(B) -6
(C) +4
(D) -4

34. The geometry of PCl₅ is

(A) Trigonal bipiramidal
(B) Octahedral
(C) Tetrahedral
(D) None

35. The shape of a XeF₂ is

(A) Linear
(B) Triangular
(C) Angular
(D) Planar

Class 12th Chemistry Objective Question English