Chapter-7 p-Block Elements MCQs
Q 41.: The incorrect statement among the following is :
(A) C60 is an allotropic form of carbon
(B) O3 is an allotropic form of oxygen
(C) S8 is only allotropic form of sulphur
(D) Red phosphorous is more stable in air than white phosphorous
Option – C
Q 42.: Which of the following metals, Fe, Zn, Pb, Ag and Pt do not give a metal nitrate on treatment with concentrated HNO3 ?
(A) Fe and Pt
(B) Fe and Zn
(C) Pb, Ag and Pt
(D) Fe, Zn and Pt
Option – A
Q 43.: If an allotropic form changes slowly to stable form, it is called _________
(A) Enantiotropy
(B) Isotropy
(C) Dynamic
(D) Monotropy
Option – D
Q 44.: Which of the following metal oxide is more basic ?
(A) ZnO
(B) Al2O3
(C) As2O3
(D) K2O
Option – D
Q 45.: Thomas slag is :
(A) CaCN2 + C
(B) Ca3(PO4)2.2H2O
(C) Ca3(PO4)2.CaSiO3
(D) CaSiO3
Option – C
Q 46.: Nausadar is
(A) NH4NO3
(B) NH4Cl
(C) NH4OH
(D) (NH4)2SO4
Option – B
Q 47.: What is the correct relationship between the pHs of isomolar solutions of sodium oxide (pH1), sodium sulphide (pH2), sodium selenide (pH3) and sodium telluride (pH4) ?
(A) pH1 > pH2 ≈ pH3 > pH4
(B) pH1 < pH2 < pH3 < pH4
(C) pH1 < pH2 < pH3 ≈ pH4
(D) pH1 > pH2 > pH3 > pH4
Option – D
Q 48.: Catalyst used in making H2SO4 in contact process is ;
(A) V2O5
(B) Fe3O4
(C) Cr2O3
(D) CrO3
Option – A
Q 49.: Fuming acid is ;
(A) H2SO4 + NO2
(B) H2SO4 + SO2
(C) H2SO4 + SO3
(D) H2SO4 + NO
Option – C
Q 50.: Ammonia form the complex ion [Cu(NH3)4]2+ with copper ions in the alkaline solution but not in acidic solutions. What is the reason for it ?
(A) In acidic solutions hydration protects copper ions
(B) In acidic solutions protons coordinate with ammonia molecules forming NH4+ ions.
(C) In acidic solutions insoluble Cu(OH)2 is precipitated which is soluble in excess of any alkali.
(D) Cu(OH)2 is an amphoteric substance.
Option – B
Q 51.: When tin is treated with concentrated nitric acid ;
(A) It is converted into stannous nitrate
(B) It is converted into metastannic acid
(C) It is converted into stannic nitrate
(D) None of These
Option – B
Q 52.: Iron is dropped in dilute nitric acid, it gives
(A) Ferric nitrate
(B) Ferrous nitrate and nitric oxide
(C) Ferric nitrate and ammonium hydroxide
(D) Ferrous nitrate and ammonium nitrate
Option – D
Q 53.: S-2 and SO3-2 can be distinguished by using
(A) (CH3COO)2Pb
(B) Na2[Fe(CN)5NO]
(C) Both ‘A’ and ‘B’
(D) None of these
Option – C
Q 54.: The gaseous product formed when HOCl reacts with H2O2 in acidic medium is ;
(A) H2
(B) Cl2
(C) O2
(D) HClO2
Option – C
Q 55.: The correct order of relative acidity is
(A) HClO > HClO2 > HClO3 > HClO4
(B) HClO4 > HClO3 > HClO2 > HClO
(C) HClO > HClO4 > HClO2 > HClO3
(D) HClO4 > HClO2 > HClO > HClO3
Option – B
Q 56.: The compound represent phosgene is
(A) Carbonyl chloride
(B) Sulphonyl chloride
(C) Phosphine
(D) Ammonium chloride
Option – A
Q 57.: Which of the following statement is incorrect ?
(A) ICl is a good conductor of electricity in fused state
(B) Cl2O7 is anhydride of perchloric acid
(C) F2 forms only one oxoacid
(D) Melting and boiling points of HBr is less than HCl
Option – D
Q 58.: Which of the following rare gas is the most abundant in air ?
(A) He
(B) Ne
(C) Ar
(D) Kr
Option – C
Q 59.: Sea weeds are an important source of
(A) Zinc
(B) Chlorine
(C) Bromine
(D) Iodine
Option – D
Q 60.: Bleaching powder losses its power on keeping for a long time because
(A) It changes into calcium chloride and calcium chlorate
(B) It changes into calcium chloride and calcium hydroxide
(C) It changes into calcium hypochlorate
(D) It changes into calcium oxide and calcium carbonate
Option – A
Q 61.: When Cl2 gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from
(A) Zero to +1 and zero to -5
(B) Zero to -1 and zero to +5
(C) Zero to +1 and zero to -3
(D) Zero to -1 and zero to +3
Option – B
Q 62.: When a colourless gas is passes through bromine water only decolourisation takes place. The gas is :
(A) SO2
(B) HBr
(C) HCl
(D) H2S
Option – A
Q 63.: When Br2 is treated with aqueous solutions of NaF, NaCl and NaI separately.
(A) F2 , Cl2 , Br2 and I2 are liberated.
(B) Only F2 and Cl2 are liberated.
(C) Only Cl2 is liberated.
(D) Only I2 is liberated.
Option – D
Q 64.: In Ramsay and Rayleigh’s isolation of noble gases from air the nitrogen of the air is finally converted into
(A) NaNO2 only
(B) NO and NO2
(C) NaNO3 only
(D) NaNO2 and NaNO3
Option – D
Q 65.: Number of non-bonding electron pair on ‘Xe’ in XeF6 , XeF4 and XeF2 respectively will be :
(A) 6, 4, 2
(B) 1, 2, 3
(C) 3, 2, 1
(D) 0, 3, 2
Option – B
Q 66.: Molecules of a noble gas do not possess vibrational energy because a noble gas
(A) is monoatomic
(B) is chemically inert
(C) has completely filled shell
(D) is diamagnetic
Option – A
Q 67.: Argon possesses
(A) translational motion only
(B) translation + rotational motion
(C) translation + vibrational motion
(D) translational + rotational + vibrational motion
Option – A
Q 68.: The geometry of XeOF2 is
(A) Pyramidal
(B) T-shaped
(C) Octahedral
(D) Tetrahedral
Option – B
Q 69.: Least volatile hydrogen halide is
(A) HI
(B) HCl
(C) HF
(D) HBr
Option – C
Q 70.: Which one of the following halogen has the highest bond dissociation energy ?
(A) F2
(B) Cl2
(C) Br2
(D) I2
Option – B
Q 71.: In the manufacture of bromine from sea water, the mother liquor containing bromide is treated with
(A) Carbon dioxide
(B) Sulphur dioxide
(C) Chlorine
(D) Iodine
Option – C
Q 72.: The coloured discharged tubes for a advertisement mainly contain
(A) Xenon
(B) Helium
(C) Neon
(D) Argon
Option – C
Q 73.: Which one has the highest boiling point ?
(A) H2
(B) CH4
(C) Xe
(D) He
Option – C
Q 74.: The noble gas which can diffuse through rubber and glass easily is
(A) Xe
(B) Ne
(C) Ar
(D) He
Option – D
Q 75.: The noble gas compound prepared by Bartlett was
(A) XeO3
(B) XePtF6
(C) KrF2
(D) XeF2
Option – B
Q 76.: Which of the following dissolves in water but does not give any oxoacid solution ?
(A) OF2
(B) SO2
(C) SO3
(D) SCl4
Option – A
Q 77.: Which one of the following is the true covalent oxide of iodine ?
(A) I2O9
(B) I2O7
(C) I2O5
(D) I2O4
Option – C
Q 78.: In the separation of noble gas mixture from air by Ramsay Rayleigh’s first method, the substances used for the removal of N2 and O2 respectively, are
(A) Ca and Mg
(B) KOH solution
(C) C and CaC2
(D) Mg and Cu
Option – D
Q 79.: Helium is used in balloons in place of hydrogen because it is
(A) Incombustible
(B) Lighter than hydrogen
(C) Non-radioactive
(D) More abundant than hydrogen
Option – A
Q 80.: Colour of the solution when KI reacts with Br2 is
(A) Blue
(B) Red
(C) Green
(D) Black
Option – D