JEE Questions for Chemistry Class 11 P Block Elements Quiz 3 - MCQExams.com

The stability of +1 oxidation state among Al, Ga, In and Tl increases in the sequence :
  • Ga < In < Al < Tl
  • Al < Ga < In < Tl
  • Tl < In < Ga < Al
  • In < Tl < Ga < Al
Aluminium is obtained by
  • reducing Al2O3 with coke
  • electrolysing Al2O3 dissolved in Na3 AlF6
  • reducing Al2O3 with chromium
  • heating alumina with cryolite
Alums are used for
  • tanning of leather
  • coagulation of blood
  • purification of water
  • All of these
BCl3 + H2O → X, the products formed in the reaction are
  • B2O3 + HOCl
  • H3BO3 + HCl
  • B2H6 + HCl
  • No reaction
The mass of carbon anode consumed (giving only carbon dioxide) in production of 270 kg of aluminium metal from bauxite by the Hall process is
(Atomic mass of Al =
  • 180 kg
  • 270 kg
  • 540 kg
  • 90 kg
Which one of the following compounds, is not a protonic acid ?
  • SO(OH)2
  • SO2(OH)2
  • B(OH)3
  • PO(OH)3
The structure of diborane (B2H6) contains
  • four 2c -2e - bonds and four 3 c -2e - bonds
  • two 2c - 2e - bonds and two 3 c -3e - bonds
  • two 2c -2e - bonds and four 3 c -2e - bonds
  • four 2c - 2e - bonds and two 3 c - 2e - bonds
Purification of alumina takes place by
  • Bosch process
  • Hall's process
  • Hoope's process
  • quartation process
The chief impurity present in red bauxite is
  • NaF
  • SiO2
  • Fe2O3
  • K2SO4
An element `X ' which occurs in the first short period has an outer electronic structure s 2 p 1 . What is the formula and acid-base character of its oxides?
  • X O3, basic
  • X 2O3, basic
  • X 2O3, acidic
  • X O2, acidic
Aluminium Chloride exists as dimer, Al2 Cl6 in solid state as well as in solution of non-polar solvents such as benzene. When dissolved in water, it gives
  • Al3+ + 3Cl -
  • [Al(H2O)6 ]3+ + 3Cl -
  • [Al(OH)6 ]3- + 3HCl
  • Al2O3 + 6HCl
B(OH)3 + NaOH ⇌ NaBO2 + Na [B(OH)4] + H2O. How can this reaction is made to proceed in forward direction ?
  • Addition of cis-1, 2 -diol
  • Addition of borax
  • Addition of trans-1, 2 -diol
  • Addition of Na2HPO4
Which of the following is a use of alum ?
  • Making explosives
  • Bleaching clothes
  • Water softening
  • All of the above
Alum is added to muddy water because
  • it acts as disinfectant
  • it results in coagulation of clay and sand
  • clay is soluble in alum, hence removes it
  • it makes water alkaline which is good for health
Heating an aqueous solution of aluminium chloride to dryness will give
  • Al(OH)Cl2
  • Al2O3
  • Al2Cl6
  • AlCl3
In Goldschmidt aluminothermic process, thermite contains
  • 3 parts of A2O3 and 4 parts of Al
  • 3 parts of Fe2O3 and 2 parts of Al
  • 3 parts of Fe2O3 and 1 part of Al
  • 1 part of Fe2O3 and 1 part of Al
The order of acidic strength of boron trihalides
  • BF3 < BCl3 < BBr3 < BI3
  • BI3 < BBr3 < BCl3 < BF3
  • BCl3 < BBr3 < BI3 < BF3
  • BBr3 < BCl3 < BF3 < BI3
  • BF3 < BI3 < BCl3 < BBr3
Purification of Al by electrolysis method is called
  • Hall's process
  • Baeyer process
  • Ostwald process
  • Hoope's process
The carbon based reduction method is not used for the extraction of
  • tin from SnO2
  • iron from Fe2O3
  • aluminium from Al2O3
  • magnesium from MgCO3 , CaCO3
  • Both (and (4)
With respect to graphite and diamond, which of the statement(s) given is (are) correct?
  • Graphite is harder than diamond
  • Graphite has higher electrical conductivity than diamond
  • Graphite has higher thermal conductivity than diamond
  • Graphite has higher C—C bond order than diamond
  • Both (and (4)
CO2 goes to air, causes green house effect and gets dissolved in water. What will be its effect on soil fertility and pH of the water?
  • Increase
  • Decrease
  • Remain same
  • None of these
Which type of silicate is shown in the given figure?
Chemistry-Class 11 p Block Elements-2113.png
  • Orthosilicate
  • Pyrosilicate
  • Metasilicate
  • None of these
In feldspar and zeolite, Si 4+ ions are replaced by which ions?
  • Oxide ion
  • Hydroxide ion
  • Aluminium ion
  • Potassium ion
Among the following substituted silanes, the one which will give rise to cross linked silicon polymer on hydrolysis is
  • R4Si
  • RSiCl3
  • R2SiCl3
  • R3SiCl
Identify B in the following reaction,
Chemistry-Class 11 p Block Elements-2114.png
  • corundum
  • quartz
  • silica
  • carborundum
Diamond is hard because
  • all the four valence electrons are bonded to each carbon atom by covalent bonds
  • it is a giant molecule
  • it is made up of carbon atoms
  • it cannot be burnt
Silica is a/an
  • acidic flux only
  • gangue only
  • basic flux only
  • Both gangue and acidic flux
In silica (SiO2), each silicon atom is bonded to
  • two oxygen atoms
  • four oxygen atoms
  • one silicon and two oxygen atoms
  • one silicon and four oxygen atoms
The stability of dihalides of Si, Ge, Sn and Pb increases steadily in the sequence
  • GeX2 < SiX2 < SnX2 < PbX2
  • SiX2 < GeX2 < PbX2 < SnX2
  • SiX2 < GeX2 < SnX2 < PbX2
  • PbX2 < SnX2 < GeX2 < SiX2
Monosilane on coming in contact with air bums with a luminous flame producing vortex rings. These rings are of
  • SiO2
  • SiO
  • Si
  • H2SiO3
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