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The p-Block Elements Class 11 MCQs Questions with Answers
Orthoboric acid when heated to red heat gives
(a) Metaboric acid
(b) Tetraboric acid
(c) Boron trioxide
(d) Borax
Answer: (c) Boron trioxide
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: (a) Four 2c – 2e bonds and two 3c – 2e bonds
Graphite is soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite
(a) Has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interplate bonds
(b) Is a non-crystalline substance
(c) Is an allotropic form of carbon
(d) Has molecules of variable molecular masses like polymers
Answer: Show Answer (a) Has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interplate bonds
Thermodynamically the most stable form of carbon is
(a) Diamond
(b) Graphite
(c) Peat
(d) Coal
Answer: (b) Graphite
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: (b) By action of ultraviolet rays on oxygen molecule
Which of the following statements about boric acid is false?
(a) It acts as a monobasic acid
(b) It is formed by the hydrolysis of boron halides
(c) It has planar-structure
(d) It acts as a tribasic acid
Answer: (d) It acts as a tribasic acid
From B2H6 all the following can be prepared except
(a) H3BO3
(b) B2(CH3)4H2
(c) B2(CH3)6
(d) NaBH4
Answer: (d) NaBH4
Which of the following is the most commonly used refrigerant?
(a) CFCl3
(b) CCl3Br
(c) CF3Cl
(d) CF2Cl2
Answer: (d) CF2Cl2
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: (d) It has a polymeric structure
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) C−Cl > C−Br > C−I
The increasing order of atomic radii of the following group 13 elements are:
(a) Al < Ga < In < Tl
(b) Ga < Al < In < Tl
(c) Al < In < Ga < Tl
(d) Al < Ga < Tl < In
Answer: (b) Ga < Al < In < Tl
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: (c) Strong attractive force between the atoms
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) B > P > As > Bi
In graphite, the electrons are
(a) localised on every third carbon atom.
(b) present in antibonding orbitals
(c) localised on each carbon atom
(d) spread out between the structure
Answer: (d) spread out between the structure
Percentage of lead in lead pencils is
(a) Zero
(b) 20
(c) 80
(d) 70
Answer: (a) Zero
Which of the following oxidation states are the most characteristic for lead & tin respectively
(a) +2, +2
(b) +4, +2
(c) +2, +4
(d) +4, +4
Answer: (c) +2, +4
In white phosphorous (P4) molecule, which one is not correct
(a) 6P-P single bonds are present
(b) 4P-P single bonds are present
(c) 4 lone pair of electrons is present
(d) P-P-P bond angle is 60°
Answer: (a) 6P-P single bonds are present
Which of the following allotropic forms of carbon is isomorphous with crystalline silicon?
(a) Graphite
(b) Coal
(c) Coke
(d) Diamond
Answer: (d) Diamond
Borax is used as a cleansing agent because on dissolving in water, it gives
(a) Alkaline solution
(b) Acidic solution
(c) Bleaching solution
(d) Amphoteric solution
Answer: (a) Alkaline solution
On heating boron with caustic potash, the pair of products formed are
(a) Potassium Borate + Dihydrogen
(b) Potassium Borate + Water
(c) Potassium Borate + H2
(d) Borax + Dihydrogen
Answer: (a) Potassium Borate + Dihydrogen
Fertilizer having the highest nitrogen percentage is:
(a) Calcium cyanamide
(b) Urea
(c) Ammonium nitrate
(d) Ammonium sulphate
Answer: (b) Urea
Which is strongest lewis acid?
(a) BF3
(b) BCl3
(c) BBr3
(d) BI3
Answer: (d) BI3
White lead is
(a) Pb3O4
(b) PbO
(c) 2PbCO3.Pb(OH)2
(d) Pb (CH3COO)2.Pb(OH)2
Answer: (c) 2PbCO3.Pb(OH)2
Which of the following forces bind together carbon atoms in diamond?
(a) Ionic
(b) Covalent
(c) Dipolar
(d) van der Waals
Answer: (b) Covalent
Among the following, electron-deficient compound is
(a) CCl4
(b) PCl5
(c) BeCl2
(d) BCl3
Answer: (d) BCl3
Boric acid is polymeric due to
(a) Its acidic nature
(b) The presence of hydrogen bonds
(c) Its monobasic nature
(d) Its geometry
Answer: (b) The presence of hydrogen bonds
An aqueous solution of borax is
(a) Basic
(b) Acidic
(c) Neutral
(d) Amphoteric
Answer: (a) Basic
Which of the following is not a protonic acid?
(a) B(OH)3
(b) PO(OH)3
(c) SO(OH)2
(d) SO2(OH)2
Answer: (a) B(OH)3
Which one of the following has the lowest m.p.?
(a) Ga
(b) B
(c) Al
(d) Tl
Answer: (a) Ga
All the elements of oxygen family are
(a) Non metals
(b) Metalloids
(c) Radioactive
(d) Polymorphic
Answer: (d) Polymorphic
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