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Free download in PDF Class 12 Chemistry Chapter 7 p Block Elements Objective Type Questions with Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like NEET, AIIMS, JIPMER etc. These short solved questions or quizzes are provided by Gkseries./p>
(1)
Supercritical CO2 is used as
[A]
Dry ice
[B]
Fire fighting
[C]
A Solvent for extraction of organic compound from natural sources
[D]
A highly inert medium for carrying out various reactions
Answer: A Solvent for extraction of organic compound from natural sources
(2)
Products formed on heating Pb(NO3)2 are
[A]
PbO, N2, O2
[B]
Pb(NO2)2, O2
[C]
PbO, NO2, O2
[D]
Pb, N2, O2
(3)
Which of the following lead oxide is 'Sindhur'
[A]
PbO
[B]
PbO2
[C]
Pb2O3
[D]
Pb3O4
(4)
Percentage of lead in lead pencil is
[A]
O
[B]
20
[C]
80
[D]
70
(5)
Pb reacts with dilute HNO3 gives
[A]
NO
[B]
N2O5
[C]
NH4NO3
[D]
NO2
(6)
In silicon dioxide
[A]
Each Si atom is surrounded by four oxygen atoms and each oxygen atom is bonded to two Si Atoms
[B]
Each Si atom is surrounded by four O2 atoms and each O2 by 2Si atom
[C]
Si atom is bonded to two oxygen atoms
[D]
None of above
Answer: Each Si atom is surrounded by four oxygen atoms and each oxygen atom is bonded to two Si Atoms
(7)
Litharge is chemically
[A]
PbO
[B]
PbO2
[C]
Pb3O4
[D]
Pb(CH3COO)2
(8)
Which of the following has most density
[A]
Fe
[B]
Ca
[C]
B
[D]
Pb
(9)
Red lead is an example of an ______ Oxide
[A]
Basic
[B]
Super
[C]
Mixed
[D]
Amphoteric
(10)
Element showing the phenomenon of allotropy is ______
[A]
Alluminium
[B]
Lead
[C]
Tin
[D]
Copper
(11)
Which of the following is a metalloid
[A]
Bi
[B]
Sn
[C]
Ge
[D]
C
(12)
Which gas is liberated when Al4C3 is hydrolysed
[A]
CH4
[B]
C2H2
[C]
C2H6
[D]
CO2
(13)
Which of the following attacks glass
[A]
HCl
[B]
HF
[C]
HI
[D]
HBr
(14)
Dry ice is
[A]
Solid CO2
[B]
Solid NO2
[C]
Solid SO2
[D]
None
(15)
SiCl4 on hydrolysis forms 'X' & HCl Compound 'X' loses water at 1000°C & gives 'Y'. Compound 'X' & 'Y' are respectively.
[A]
H2SiCl6, SiO2
[B]
H2SiO4, Si
[C]
SiO2, Si
[D]
H4SiO4, SiO2
(16)
Pure silicon doped with phosphorous is a
[A]
Metallic conductor
[B]
Insulator
[C]
n - type semiconductor
[D]
P - type semiconductor
Answer: n - type semiconductor
(17)
Carbogen is a mixture of
[A]
CO + N2
[B]
CO + O2
[C]
CO2+ O2
[D]
C + H2 + N2
(18)
The element evolving two different gases on reaction with conc. H2SO4 is ______.
(19)
Carborundum is obtained when silica is heated at high temperature with
[A]
C
[B]
CO
[C]
CO2
[D]
CaCo3
(20)
Lead pipes are corroded quickly by
[A]
DiL H2SO4
[B]
Conc.H2SO4
[C]
Acetic Acid
[D]
Water
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