MCQ on Class 11 Chemistry Chapter 11 The P Block Elements

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Questions
1 In the compound of type ECl3, where E = B, P, As, or Bi, the angle Cl – E – Cl for different E are ion the order:
A B > = P = As = Bi
B B > P > As > Bi
C B < P = As = Bi
D B < P < As < Bi

Answer:B > P > As > Bi
2 On heating ozone, its volume.
A Increase to 1.5 times
B Decreases to half
C Remain uncharged
D Becomes double

Answer:Increase to 1.5 times
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3 In general, the Boron Trihaides act as
A Strong reducing agent
B Lewis Acids
C Lewis Bases
D Dehydrating Agents

Answer:Lewis Acids
4 Inert gases such as helium behave like ideal gases over a wide range of temperature .However; they condense into the solid state at very low temperatures. It indicates that at very low temperature there is a
A Weak attractive force between the atoms
B Weak repulsive force between the atoms
C Strong attractive force between the atoms
D Strong repulsive attractive between the atoms

Answer:Strong attractive force between the atoms
5 Ammonia gas can be dried by
A conc H2SO4
B P2O5
C CaCl2
D Quick lime

Answer:Quick lime
6 P Block Element

Which of the statement is true for the above sequence of reactions?

A Z is hydrogen
B X is B2H6
C Z and Y are F2 and B2H6 respectively
D Z is Potassium Hydroxide

Answer:Z and Y are F2 and B2H6 respectively
7 If Cl2 gas is passed in to aqueous solution of Kl containing some CCl4 and the mixture is shaken then:
A Upper layer becomes violet
B Lower layer becomes violet
C Homogenous violet layer is formed
D None of these

Answer:Upper layer becomes violet
8 Which of the following has least covalent P−H bond?
A PH+4
B P2H+5
C P2H2+6
D PH3

Answer:P2H2+6
9 K2[Hgl4] detect the ion/group :
A NH2
B NO
C NH2+
D Cl–

Answer:NH2+
10 Which of the following statements regarding ozone is not correct?
A The oxygen-oxygen bond length in ozone is identical with that of molecular oxygen
B The ozone is response hybrid of two structures
C The ozone molecule is angular in shape
D Ozone is used as a germicide and disinfectant for the purification of air.

Answer:The oxygen-oxygen bond length in ozone is identical with that of molecular oxygen
11 When excess of Kl is added to copper sulphate solution:
A Cuprous iodide is formed
B l2 is liberated
C Potassium iodide is oxidized
D All

Answer:All
12 Which of the following oxidation states are most characteristic for lead and tin respectively?
A 2, 2
B 4, 2
C 2, 4
D 4, 4

Answer:2, 4
13 Among the C-X bond (where, X = Cl, Br, l) the correct decreasing order of bond energy is
A C−I > C−Cl > C−Br
B C−I > C−Br > C−Cl
C C−Cl > C−Br > C−I
D C−Br > C−Cl > C−I

Answer:C−Cl > C−Br > C−I
14 In the upper layers of atmosphere ozone is formed:
A By action of electric discharge on oxygen molecule
B By action of ultraviolet rays on oxygen molecule
C By action of infrared rays on oxygen molecule
D Due to sudden drops of pressure

Answer:By action of ultraviolet rays on oxygen molecule
15 Oxygen gas can be prepared from solid KMnO4 by:
A Dissolving the solid in dil. HCl
B Dissolving the solid in conc. H2SO4
C Treating the solid with H2 gases
D Strongly heating the solid

Answer:Strongly heating the solid
16 Which is not the correct statement for Boron?
A It exhibits Allotropy
B It exists in both crystalline and Amorphous form
C It forms solid chlorides
D It forms volatile hydrides.

Answer:It forms solid chlorides
17 The structure of diBorane contains
A Four 2c – 2e bonds and two 3c – 2e bonds
B Two 2c – 2e bonds and two 3c – 2e bonds
C Two 2c – 2e bonds and two 3c – 3e bonds
D Four 2c – 2e bonds and four 3c – 2e bonds

Answer:Four 2c – 2e bonds and two 3c – 2e bonds
18 Which of the following statement is correct?
A Copper (I) metaborate is colourless
B Copper (II) metaborate is colourless
C Copper (II) metaborate is light green
D Copper (I) metaborate is dark green

Answer: Copper (I) metaborate is colourless
19 Which of the following will not produce hydrogen gas?
A Reaction between Fe and dil. HCl
B Reaction between Zn and NaOH
C Reaction between Zn and conc. H2SO4
D Electrolysis of NaCl in Nelsons cell

Answer:Reaction between Zn and conc. H2SO4
20 Red phosphorus is chemically less reactive because
A It does not contain P – P bonds
B It dos not contain tetrahedral P4 molecules
C It does not catch fire in air even upto 400°C
D It has a polymeric structure

Answer:It has a polymeric structure

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