Class 12 Chemistry Chapter 7 p Block Elements MCQs | Class 12 Chemistry Chapter 7 p Block Elements Objective Type Questions with Answers

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Questions
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

Answer:PbO, NO2, O2
3 Which of the following lead oxide is 'Sindhur'
A PbO
B PbO2
C Pb2O3
D Pb3O4

Answer: Pb3O4
4 Percentage of lead in lead pencil is
A O
B 20
C 80
D 70

Answer:O
5 Pb reacts with dilute HNO3 gives
A NO
B N2O5
C NH4NO3
D NO2

Answer: NO
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

Answer:PbO
8 Which of the following has most density
A Fe
B Ca
C B
D Pb

Answer:Pb
9 Red lead is an example of an ______ Oxide
A Basic
B Super
C Mixed
D Amphoteric

Answer: Mixed
10 Element showing the phenomenon of allotropy is ______
A Alluminium
B Lead
C Tin
D Copper

Answer: Tin
11 Which of the following is a metalloid
A Bi
B Sn
C Ge
D C

Answer: Ge
12 Which gas is liberated when Al4C3 is hydrolysed
A CH4
B C2H2
C C2H6
D CO2

Answer: CH4
13 Which of the following attacks glass
A HCl
B HF
C HI
D HBr

Answer: HF
14 Dry ice is
A Solid CO2
B Solid NO2
C Solid SO2
D None

Answer:Solid CO2
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

Answer: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

Answer:CO2+ O2
18 The element evolving two different gases on reaction with conc. H2SO4 is ______.
A P
B C
C Hg
D S

Answer:C
19 Carborundum is obtained when silica is heated at high temperature with
A C
B CO
C CO2
D CaCo3

Answer: C
20 Lead pipes are corroded quickly by
A DiL H2SO4
B Conc.H2SO4
C Acetic Acid
D Water

Answer:Acetic Acid

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