JEE Questions for Chemistry Class 12 P Block Elements Quiz 11 - MCQExams.com

In Goldschmidt aluminothermic process, thermite contains
  • 3 parts of Al2O3 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
Aluminium oxide is not reduced by chemical reactions since
  • Aluminium oxide is reative
  • Reducing agents contaminate
  • Aluminium oxide is highly stable
  • The process pollutes the environment
Aluminium is not used
  • In silvery paints
  • For making utensils
  • As a reducing agent
  • As oxidizer in metalurgy
Bauxite containing impurities of iron oxide is purified by
  • Hoop’s Process
  • Serpeck’s Process
  • Bayer’s Process
  • Electrolytic process
In the purification of Bauxite by Hall’s process
  • Bauxite ore is heated with NaOH solution at 50o C
  • Bauxite ore is heated with NaHCO3
  • Bauxite ore is fused with coke and heated at 1800o C in a current of nitrogen
  • Bauxite ore is heated with NaCO3
The molecular formula of feldspar is

  • Chemistry-Class 12 p Block Elements-2688.png
  • 2)
    Chemistry-Class 12 p Block Elements-2689.png

  • Chemistry-Class 12 p Block Elements-2690.png

  • Chemistry-Class 12 p Block Elements-2691.png
Common alum is

  • Chemistry-Class 12 p Block Elements-2692.png
  • 2)
    Chemistry-Class 12 p Block Elements-2693.png

  • Chemistry-Class 12 p Block Elements-2694.png

  • Chemistry-Class 12 p Block Elements-2695.png
Which of the following is not true about potash Alum
  • It’s empirical formula is Kal(SO4)2. 12H2O
  • It’s aqeous solution is basic
  • It is Used in dyeing industries
  • On heating it melts in it’s water of crystallization
Which of the following statements about H3BO3 is not correct
  • It is a strong tribasic acid
  • It is prepared by acidifying an aqeous solution of Borax

  • Chemistry-Class 12 p Block Elements-2696.png
  • It doesn’t act as proton donar but acts as a lewis acid by accepting hydroxyl ion
The type of hybridization of boron in diborane is.
  • Sp - hybridization
  • Sp2- hybridization
  • Sp3- hybridization
  • Sp3d2 - hybridization
Identify the statement that is not correct as far as structure of diborane is concerned
  • There are two bridging hydrogen atoms in diborane
  • Each boron atom forms four bonds in diborane
  • The hydrogen atoms are not in the same plane in diborane
  • All B–H bonds in diborane are similar
Soft heavy metal melts at 30o C and is used in making heat sensitive thermometers, the metal is
  • Gallium
  • Sodium
  • Potassium
  • Cesium

Chemistry-Class 12 p Block Elements-2697.png
  • BCl3
  • BCl2
  • B2Cl2
  • CCl2
The most acidic of the following compound is
  • P2O3
  • Sb2O3
  • B2O3
  • As2O3
Heating an aqeous solution of aluminium chloride to dryness will give
  • AlCl3
  • Al2Cl6
  • Al2O3
  • Al(OH)Cl2
Which of the following is the electron deficient molecule
  • B2H6
  • C2H6
  • PH3
  • SiH4
The structure of diborane Contains
  • Four 2c - 2e bonds and two 3c - 2e bonds
  • Two 2c - 2e bonds and Four 3c - 2e bonds
  • Two 2c - 2e bonds and two 3c - 3e bonds
  • Four 2c - 2e bonds and four 3c - 2e bonds
In Hall Heroult's process, the main reagent is mixed with
  • B2H6
  • C2H6
  • Na3AlF6
  • SiH4
Which of the following statement in incorrect
  • Al react with excess NaOH to give Al(OH)3
  • NaHCO3 on heating gives Na2CO3
  • Pure sodium metal dissolves in liquid ammonia to give blue solution
  • NaOH reats with glass to give sodium silicate
Which of the following is nonmetal
  • Ga
  • In
  • Th
  • B
Which one of the following statements about diborane is not true
  • The B atoms in it are SP3 hybridised
  • It contains two 3-centre-2-electron bonds
  • All B-H bond lengths in it are equal due to resonance
  • The molecule contains 12 valence electrons
Boron shows single oxidation state due to absence of
  • Inert pair effect
  • Screening effect
  • Isotope effect
  • None
Which of the following is non – existent

  • Chemistry-Class 12 p Block Elements-2700.png
  • 2)
    Chemistry-Class 12 p Block Elements-2701.png

  • Chemistry-Class 12 p Block Elements-2702.png

  • Chemistry-Class 12 p Block Elements-2703.png
Which of the processes is used in thermite welding

  • Chemistry-Class 12 p Block Elements-2704.png
  • 2)
    Chemistry-Class 12 p Block Elements-2705.png

  • Chemistry-Class 12 p Block Elements-2706.png

  • Chemistry-Class 12 p Block Elements-2707.png
In which of the following molecules is hydrogen bond absent
  • Methanol
  • Water
  • Inorganic benzene
  • Diborane
The tendency of BF3, BCl3 and BBr3 to behave as lewis acid decreases in the sequence
  • BF3 > BCl3 > BBr3
  • BCl3 > BF3 > BBr3
  • BBr3 > BCl3 > BF3
  • BBr3 > BF3 > BCl3
Which one of the following molecular hydrides acts a a lewis acid
  • CH3
  • NH3
  • H2O
  • B2H6
The compound which does not possess a peroxide linkage is
  • Na2O2
  • CrO5
  • H2SO5
  • PbO2
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 partial pressure of oxygen in the air
  • A change in the crystalline structure of tin
  • An interaction with nitrogen of air at very low to temperatures
  • An interaction with water vapour contained in the humid air
Which one of the following statements about the zeolites is false
  • Zeolites are aluminosilicates having 3D network
  • 2)
    Chemistry-Class 12 p Block Elements-2709.png
  • They are used as cation exchangers
  • They have open structure which enables them to take up small molecules.
Which of the following acts UV rays
  • Soda glass
  • Crook's glass
  • Pyrex
  • None
The Stability of dihalides of Si, Ge, Sn and Pb increases steadily in the sequence

  • Chemistry-Class 12 p Block Elements-2710.png
  • 2)
    Chemistry-Class 12 p Block Elements-2711.png

  • Chemistry-Class 12 p Block Elements-2712.png

  • Chemistry-Class 12 p Block Elements-2713.png
Sodium oxalate on heating with cone H2SO4 gives
  • CO Only
  • CO2 only
  • CO and CO2
  • SO2 and SO3
Glass reacts with HF to produce
  • SiF4
  • H2SiF6
  • H2SiO3
  • Na3AlF6
Extraction of lead by reduction methods done by
  • Adding more galena into reverberatory furnace
  • Adding more lead sulphate in reverberatory furnace
  • Adding more galena and coke into the reverberatory furnace
  • Self reduction of oxide form sulphide present in the furnace
Which is used to produce smoke screen
  • Calcium phosphide
  • Zinc sulphide
  • Sodium carbonate
  • Zinc phosphide
When tin is treated with concentrated nitric acid
  • It is converted in to stannous nitrate
  • It is converted in to stannic nitrate
  • It is converted in to metastannic acid
  • It becomes passive
In lll A group Tl (thallium) shows +1 Oxidation state while other members show +3 oxidation state. Why?
  • Presence of lone pair of electron in Tl.
  • Inert pair effect
  • Large Ionic redius of Tl ion
  • None
Carbon suboxide C3O2 has
  • Linear structure
  • Bent structure
  • Trigonal planar structure
  • Distorted tetrahedral structure
Which of the following is a mixed oxide
  • Fe2O3
  • PbO2
  • Pb3O4
  • BaO2
Noble gases are absorbed in
  • Anhydrous CaCl2
  • Charcoal
  • Conc, H2SO4
  • Coconut
Solid CO2 is known as dry ice because
  • It melts as Oo C
  • It evaporates at 40o C
  • It evaporates at - 78o C without melting
  • Its boiling point is more than 199o C
Carborundum is
  • SiC
  • AlCl3
  • Al2(SO4)3
  • Al2O3. 9H2O
H2O2 on reaction with PbS gives
  • PbO
  • PbSO4
  • PbO2
  • PbHSO4
Which of the following statements is incorrect
  • Silicon is extensively used as a semiconductor
  • Carborandum is SiC
  • Silicon occurs in free state in nature
  • Mica contains the element silicon
SiF4 gets hydrolysed gives
  • SiO2
  • Si(OH)2F2
  • H2SiF6
  • Si(OH)4
Silicon is an important constituent of
  • Rocks
  • Amalgams
  • Chlorophyll
  • Haemoglobin
The number of unpaired electrons in carbon atom is
  • 1
  • 2
  • 3
  • 4
Colour is imparted to glass by mixing
  • Synthetic gas
  • Metal oxide
  • Oxide of non – metal
  • Coloured Salt
Which of the following glass is used in making wind screen of automobiles.
  • Crook's Glass
  • Jena Glass
  • Safety Glass
  • Pyrex Glass
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Chemistry Quiz Questions and Answers