JEE Questions for Chemistry Class 11 P Block Elements Quiz 5 - MCQExams.com

Aluminium becomes passive in
  • Conc. HNO3
  • H2CrO4
  • HClO4
  • All
An example of alum is
  • Al2(SO4)3.Na2SO4. 12 H2O
  • FeSO4.(NH4)2SO4.6H2O
  • K2SO4. Al2(SO4)3. 24 H2O
  • FeSO4. Al2(SO4)3. 24 H2O
Which of the following is a Lewis Acid?
  • PCl3
  • AlCl3
  • NCl3
  • AsCl3
Which of the following properties of aluminium makes it useful for food packaging?
  • Good thermal conductivity
  • Good electrical conductivity
  • Low density
  • Non – toxicity
AlCl3 on hydrolysis gives
  • Al2O3.H2O
  • Al(OH)3
  • Al2O3
  • AlCl3.6H2O
Action of caustic soda on aluminium hydroxide gives a compound having formula
  • Al2(OH)4
  • Na2Al(OH)4
  • NaAlO2
  • Na3AlO3
Corundum is
  • Al2(SO4)3
  • Al2O3.H2O
  • Al2O3. 2H2O
  • Al2O3
In the case of small cuts, bleeding is stopped by applying potash alum. Here alum acts as
  • Germicide
  • Disinfectant
  • Fungicide
  • Coagulation agent
Which one is a non – metal in group 13 (III A) ?
  • B
  • Al
  • Ga
  • In
TlI3 is an ionic compound which furnishes the following ions in solution

  • Chemistry-Class 11 p Block Elements-2143.png
  • 2)
    Chemistry-Class 11 p Block Elements-2144.png

  • Chemistry-Class 11 p Block Elements-2145.png

  • Chemistry-Class 11 p Block Elements-2146.png
Thallium tribromide at room temperature, slowly gets converted to one of the following species
  • TlBr
  • Tl2Br6
  • TlBr2
  • Tl[TlBr4]
In aluminates, the coordination number of Al is
  • 4
  • 6
  • 3
  • 1
During Hoope’s process for electrolytic refining of Al, the middle layer is of
  • Pure Al
  • Impure Al
  • Cryolite + BaF2
  • Alloys of Al,Ca,Si
Boric acid is used in carrom boards for smooth gliding of pawns because
  • H3BO3 molecules are loosely chemically bonded and hence soft
  • its low density makes it fluffy
  • it can be powdered to a very small grain size
  • it is chemically inert with the plywood
  • H-bonding in H3BO3 gives it a layered structure
In the electrolytic method of obtaining aluminium from purified bauxite, cryolite is added to the charge in order to
  • minimise the heat loss due to radiation
  • protect aluminium produced from oxygen
  • dissolve bauxite and render it conductor of electricity
  • lower the melting point of bauxite
Observe the following statements regarding purification of bauxite.
I. During Hall's process, silica is removed as Si (vapour).
II. Bauxite ore contaminated with Fe2O3 is purified in Baeyer's process.
III. During Serpeck's process, AlN is formed.
The correct answer is
  • I, II and III
  • I and II
  • I and III
  • II and III
The incorrect statements among the following is/are
Chemistry-Class 11 p Block Elements-2149.png
  • I, III and IV
  • I and IV
  • II and III
  • I and III
  • IV Only
Which one of the following statements about the zeolites is false ?
  • They are used as cation exchangers
  • They have open structure which enables them to take up small molecules
  • Zeolites are aluminosilicates having three dimensional network

  • Chemistry-Class 11 p Block Elements-2150.png
The soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. White metallic tin buttons got converted to grey powder. This transformation is related to
  • a change in the crystalline structure of tin
  • an interaction with nitrogen of the air at very low temperature
  • a change in the partial pressure of oxygen in the air
  • an interaction with water vapour contained in the humid air
In silicon dioxide
  • there are double bonds between silicon and oxygen atoms
  • silicon atom is bonded to two oxygen atoms
  • each silicon atom is surrounded by two oxygen atoms and each oxygen atom is bounded to two silicon atoms
  • each silicon atom is surrounded by four oxygen atoms and each oxygen atom is bounded to two silicon atoms
Which of the following does not give borax bead test ?

  • Chemistry-Class 11 p Block Elements-2151.png
  • 2)
    Chemistry-Class 11 p Block Elements-2152.png

  • Chemistry-Class 11 p Block Elements-2153.png

  • Chemistry-Class 11 p Block Elements-2154.png
Which of the following is not correct in case of boron nitride, BN
  • It is a good insulator
  • It shows magnetic properties
  • It is hard because in one of the modifications it has diamond (zinc blende) like structure
  • It is chemically unreactive
Borax on heating strongly above its melting point melts to a liquid which then solidifies to a transparent mass commonly known as borax bead. The transparent glassy mass consists of
  • Mixture of sodium metaborate and boric anhydride
  • Boric anhydride
  • Sodium metaborate
  • Sodium pyrobarate
Among the following compounds of boron, the species which also forms π-bond in addition to σ-bonds is
  • BH3
  • BF3

  • Chemistry-Class 11 p Block Elements-2156.png
  • B2H6
Which of the following statements is not true for carbon ?
  • It forms compounds with multiple bonds
  • Its ionization energy is very high
  • It undergoes catenation
  • It shows inert pair effect
The nature of chemical bonding in graphite is
  • Covalent
  • Ionic
  • Coordinate
  • Metallic
Which of the following gases is needed by plants for their growth
  • N2
  • CO2
  • CO
  • O2
Antidote for CO poisoning is
  • Carborundum
  • Pure CO2
  • Carbogen
  • Carbonyl chloride
Carbon monoxide is absorbed by
  • Ammoniacal cuprous chloride solution
  • Pyrogallol solution
  • Chloroform
  • Carbon tetrachloride
Thermodynamically, the most stable allotrope of C is
  • Diamond
  • Graphite
  • Anthracite
  • All
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