JEE Questions for Chemistry Class 12 P Block Elements Quiz 10 - MCQExams.com

The reaction of KMnO4 and HCl results in
  • Oxidation of Mn in KMnO4 and production of Cl2
  • Reduction of Mn in KMnO4 and production of H2
  • Oxidation of Mn in KMnO4 and production of H2
  • Reduction of Mn in KMnO4 and production of Cl2
Which of the following is incorrect with respect to property indicated
  • E.N : F > Cl > Br
  • EA : Cl > Br < F
  • oxidising powder: F2 > Cl2 > Br2
  • Bond energy: F2 > Cl2 >Br2
The hybridization in ICl7 is
  • sp3d3
  • d2sp3
  • sp3d
  • sp3
The correct decreasing order of acidic character is
  • HClO > HBrO > HIO
  • HIO > HBrO > HCIO
  • HBrO > HIO > HClO
  • HCIO > HIO > HBrO
The set with correct order of acidity is
  • HClO < HClO2 < HClO3 < HClO4
  • HClO4 < HClO3 < HClO2 < HClO
  • HClO < HClO4 < HCIO3 < HClO2
  • HClO4 < HClO2 < HClO3 < HClO
The bond energies of F2, Cl2, Br2 and I2 are 37, 58 46 and 36 k cal mol-1 respectively. The strongest bond is present in
  • Br2
  • I2
  • Cl2
  • F2
Which one of the following order is correct for the bond energies of halogen molecules?
  • I2 > Cl2 >Br2
  • Br2 > Cl2 > I2
  • I2 > Br2 > Cl2
  • Cl2 > Br2 > I2
Which reaction is not feasible?
  • 2KI + Br2 → 2KBr + I2
  • 2KBr + I2 → 2KI + Br2
  • 2KBr + Cl2 → 2KCI + Br2
  • 2H2O + 2F2 → 4HF + O2
Which of the following statements is true ?
  • Silicon exhibits 4 coordination number in its compounds
  • Bond energy of F2 is less than Cl2
  • Mn (III) oxidation state is more stable than Mn (II) in aqueous state
  • Elements of 15th group show only +3 and + 5 oxidation states
Which of the following statement is not true?
  • Among halide ions, iodide is the most powerful reducing agent
  • Fluorine is the only halogen that does not show a variable oxidation state
  • HOCl is stronger acid than HOBr
  • HF is a stronger acid than HCl
Concentrated hydrochloric acid when kept in open air sometimes produces a cloud of white fumes The explanation for it is that
  • Oxygen in air reacts with the emitted HCl gas to form a cloud of chlorine gas
  • Strong affinity of HCl gas for moisture in air results in forming of droplets of liquid solution which appears like a clouds smoke
  • Due to strong affinity for water, conc.HCl pulls moisture of air towards cloud
  • Conc. HCl emits strongly smelling HCl gas all the time.
Which of the following is called super acid ?
  • SbF5
  • FSO3H
  • HOCN
  • Both (and (2)
Which of the following is called anhydrone?
  • HClO4
  • Anhyd.Mg(ClO4)2
  • Anhyd.Ca(ClO4)2
  • KClO3
Which of the following properties does not correspond to the order HI < HBr < HCl < HF
  • Thermal stability
  • Reducing power
  • Ionic character
  • Dipole moment
Boron form covalent Compound due to
  • Higher ionisation enthalpy
  • Lower ionisation enthalpy
  • Small size
  • Both (a) and (c)
In diborane the Two H–B–H angles are nearly
  • 60o, 120o
  • 95o, 120o
  • 95o, 150o
  • 120o, 180o
The stability of +1 oxidation state increases in the sequence
  • Al
  • Tl
  • In
  • Ga
Which of the following is most acidic
  • Na2O
  • MgO
  • Al2O3
  • CaO
Cohen Orthoboric acid (H3BO3) is strongly heated, the residue is
  • Meta boric acid
  • Boron
  • Al2O3, 2H2O
  • None of above
Bauxite has the composition
  • Al2O3
  • Al2O3, H2O
  • Al2O3. 2H2O
  • None of above
Which one of the following is correct statement
  • The hydroxide of aluminium is more acidic than that of boron
  • The hydroxide of boron is basic, while that of aluminium is amphoteric
  • The hydroxide of boron is acidic, while that of aluminium is amphoteric
  • The hydroxide of boron & aluminium are amphoteric
AlCl3 is
  • Anhydrous & covalent
  • Anhydrous & ionic
  • covalent & basic
  • coordinate & acidic
Aluminium (III) chloride forms a dimer because
  • Higher coordination number can be achieved by aluminium
  • Aluminium has high ionization energy
  • Aluminium belongs to III group
  • It cannot form a trimer
Aluminium has a great affinity for oxygen & it’s oxidation is an exothermic process. This fact is used in
  • Preparing thin foils of aluminium
  • Making utensils
  • Preparing duralumin alloy
  • Thermite welding
Which of the following is an amphoteric oxide
  • MgO
  • Al2O3
  • Cl2O7
  • Ti2O2
When Al is added to KOH solution
  • No action takes place
  • Oxygen is evolved
  • Water is produced
  • Hydrogen is evolved
Aluminium is more reactive than iron. But Aluminium is less easily corroded than iron because
  • Aluminium is noble metal
  • Oxygen forms a protective oxide layer
  • Iron undergoes reaction easily with water
  • Iron forms mono and divalent ions
Aluminium vessels should not be washed with materials containing washing soda since
  • Washing soda is expensive
  • Washing soda is easily decomposed
  • Washing soda reacts with aluminium to form soluble aluminate
  • Washing soda reats with aluminium to form insoluble aluminium oxide
Which of the statements about anhydrous aluminium chloride is correct
  • It exists as AlCl3
  • It is not easily hydrolysed
  • It sublimes at 100o C under vaccum
  • It is a strong lewis base
Number of water molecules in Mohr’s salt is
  • 7
  • 6
  • 5
  • 8
The liquid field metal expanding on solidification is
  • Ga
  • Al
  • Zn
  • Ca
Aluminium chloride exists as dimer, Al2Cl6 in solid state as well as in solution of non-polar solvents such as benzene when dissolved in water gives

  • Chemistry-Class 12 p Block Elements-2674.png
  • 2)
    Chemistry-Class 12 p Block Elements-2675.png

  • Chemistry-Class 12 p Block Elements-2676.png

  • Chemistry-Class 12 p Block Elements-2677.png
The hardest substance amongst the following is
  • Be2C
  • Graphite
  • Titanium
  • SiC
Inorganic Benzene is
  • B2H6
  • B3N3H6
  • B3O3H6
  • (BH3)3
Anhydrous AlCl3 cannot be obtained from which of the following reactions
  • Heating AlCl3 . 6H2O
  • By Passing dry HCl over hot aluminium powder
  • By Passing dry Cl2 over hot aluminium powder
  • By passing dry Cl2 over a hot mixture of alumina and coke
Diborane combines with ammonia at 120o C to give
  • B2H6NH3
  • B2H62NH3
  • B2H63NH3
  • B2H64NH3
Which metal burn in air at high temperature with the evolution of much heat.
  • Cu
  • Hg
  • Pb
  • Al
Aluminium hydroxide is soluble in excess of sodium hydroxide forming the ion

  • Chemistry-Class 12 p Block Elements-2681.png
  • 2)
    Chemistry-Class 12 p Block Elements-2682.png

  • Chemistry-Class 12 p Block Elements-2683.png

  • Chemistry-Class 12 p Block Elements-2684.png
Moissan boron is ________
  • Amorphous boron of ultra purity
  • Crystaline boron of ultra purity
  • Amorphous boron of low purity
  • Crystalline boron of low purity
Which of the following is only acidic in nature
  • Be(OH)2
  • Mg(OH)2
  • B(OH)3
  • Al(OH)3
Which of the following does not exist in free form
  • BF3
  • BCl3
  • BBr3
  • BH3
Alumina is ________
  • Acidic
  • Basic
  • Amphoteric
  • None of these
Hydrogen gas will not produce
  • Heated cupric oxide
  • Heated ferric oxide
  • Heated stannic oxide
  • Heated aluminium oxide
Conc. HNO3 ________
  • Reacts with aluminium vigrously
  • Reacts with aluminium to form aluminium nitrate.
  • Doesn’t react with aluminium
  • Reacts with platinum
Anhydrous AlCl3 is obtained from
  • Dilute HCl & aluminium metal
  • Aluminium & chlorine gas
  • Hydrogen chloride gas & aluminium metal
  • None of the above
Which is true for an element & present in III group of the periodic table
  • It is gas at room temperature
  • It has oxidation state of +4
  • It forms R2O3
  • It forms RX2
An aqueous solution of borax is
  • Neutral
  • Acidic
  • Basic
  • None

Chemistry-Class 12 p Block Elements-2687.png
  • Addition of cis Benzene - 1,2-diol
  • Addition of Borax
  • Addition of trans-Benzene 1,2-diol
  • Addition of Na2HPO4
An element A dissolves both in acid and alkali. It is an example of
  • Allotropic nature of A
  • Dimorphic nature of A
  • Amorphous nature of A
  • Amphoteric nature of A
Which among the following is not a borane.
  • B2H6
  • B3H6
  • B4H10
  • None of these
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