chemistryChemistry class 12th English Medium

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

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Answer ⇒ (C)

2. Catenation property is maximum in

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

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Answer ⇒ (B)

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

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

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Answer ⇒ (A)

4. Element found from sea water is

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

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Answer ⇒ (C)

5. The shape of XeF 4 is

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

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Answer ⇒ (B)

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

(A) BF3
(B) BC13
(C) BBr3
(D) BI3

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Answer ⇒ (B)

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

(A) NH3
(B) H2O
(C) HCl
(D) HF

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Answer ⇒ (C)

8. Main source of helium is

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

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Answer ⇒ (C)

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

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

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Answer ⇒ (B)

10. Which one of the following is least basic ?

(A) NCl3
(B) NBr3
(C) NI3
(D) NF3

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Answer ⇒ (C)

11. H2SO4 is a/an

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

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Answer ⇒ (A)

12. Modern periodic table is given by

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

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Answer ⇒ (B)

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

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

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Answer ⇒ (D)

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

(A) F2
(B) Cl2
(C) I2
(D) Br2

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Answer ⇒ (A)

15. Which of the following has maximum ionisation potential ?

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

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Answer ⇒ (B)

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

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

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Answer ⇒ (A)

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

(A) N2O3
(B) NO2
(C) NO
(D) N2O4

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Answer ⇒ (A)

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

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Answer ⇒ (B)

19. Atomicity of phosphorus is

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

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Answer ⇒ (D)

20. The structure of white phosphorus is

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

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Answer ⇒ (C)

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

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

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Answer ⇒ (B)

22. Which of the following is a tetrabasic acid ?

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

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Answer ⇒ (C)

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

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Answer ⇒ (D)

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

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Answer ⇒ (D)

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

(A) NH4
(B) SiCl4
(C) SF4
(D) SOWhich of the following is not

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Answer ⇒ (C)

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

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Answer ⇒ (A)

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

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Answer ⇒ (D)

28. Which of the following is an isoelectronic pair ?

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

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Answer ⇒ (B)

29. Which of the following is Tribasic ?

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

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Answer ⇒ (D)

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) In white phosphorus bond angle is 60°

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Answer ⇒ (C)

31. Which is not a p-block elements ?

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

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Answer ⇒ (C)

32. H2SO2 is a/an

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

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Answer ⇒ (A)

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

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

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Answer ⇒ (A)

34. The geometry of PCl5 is

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

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Answer ⇒ (A)

35. The shape of a XeF2 is

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

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Answer ⇒ (A)

Class 12th Chemistry Objective Question English

S.NCHEMISTRY OBJECTIVE English Medium
1SOLID STATE 
2SOLUTION
3ELECTROCHEMISTRY
4CHEMICAL KINETICS
5SURFACE CHEMISTRY
6GENERAL PRINCIPLES & PROCESSES OF ISOLATION OF ELEMENTS
7 THE P-BLOCK ELEMENTS
8 THE D- AND f-BLOCK ELEMENTS
9 CO-ORDINATION COMPOUNDS
10HALOALKANES AND HALOARENES
11ALCOHOLS, PHENOLS AND ETHERS
12ALDEHYDES, KETONES AND CARBOXYLIC ACIDS
13AMINES
14BIOMOLECULES
15 POLYMERS
16CHEMISTRY IN EVERYDAY LIFE

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