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MCQ on Class 11 Chemistry Chapter 11 The P Block Elements

(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)

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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