Class 12 Chemistry Chapter 7 p Block Elements MCQs | General Knowledge Questions with Answers on Class 12 Chemistry Chapter 7 p Block Elements

Questions
1 Bond angle is minimum for
A H2O
B H2S
C H2Se
D H2Te

Answer:H2Te
2 A solution of SO2 in water reacts with H2S precipating sulphur. Here SO2 acts as
A Oxidising agent
B Reducing agent
C Acid
D Catalyst

Answer:Oxidising agent
3 Whe SO2 is passed through cupric chloride solution
A White precipitate is obtained
B Solution becomes colouless
C Solution becomes colourless & White ppt is obtained of Cu2Cl2
D No Change

Answer:Solution becomes colourless & White ppt is obtained of Cu2Cl2
4 Which of the following is acidic
A SO3
B N2O
C BeO
D HgO

Answer:SO3
5 Which of the elements listed below occurs in allotropic forms
A Iodine
B Copper
C Sulphur
D Silver

Answer: Sulphur
6 Oxygen was discovered by
A Priestly
B Scheele
C Boyle
D Cavendish

Answer: Priestly
7 Shape of O2F2 is similar to that of
A C2F2
B H2O2
C H2F2
D C2H2

Answer:H2O2
8 Which of the following is not a chalcogen
A O
B S
C Se
D Na

Answer:Na
9 Which of the following is a suboxide
A Ba2O
B Pb2O
C C3O2
D ZnO

Answer:C3O2
10 KO2 + CO2 → ? (gas)
A H2
B N2
C O2
D CO

Answer: O2
11 H2SO4 acts as dehydrating agent in its reaction with
A H2C2O4
B Ba(OH)2
C KOH
D Zn

Answer: H2C2O4
12 A gas that can not be collected over water is
A N2
B O2
C SO2
D PH3

Answer:SO2
13 The molecular formula of dithionic acid is
A H2S2O4
B H2S2O6
C H2S2O5
D H2S2O7

Answer:H2S2O6
14 Oxygen is not evolved on reaction of ozone with
A H2O2
B SO2
C Hg
D KI

Answer:SO2
15 α and β form of sulphur both are stable at
A 369oC
B 369K
C 4oC
D 0oC

Answer:369K
16 SO2 + H2S → X The final product is
A H2O + S
B H2SO4
C H2SO3
D H2S2O3

Answer:H2O + S
17 Sulphur in +3 oxidation state is present in
A Sulphurous acid
B Pyrosulphuric acid
C Dithionous acid
D Thiosulphuric acid

Answer:Dithionous acid
18 H2S is not a/an
A Reducing agent
B Acidic
C Oxidising agent
D None

Answer:Oxidising agent
19 Which one of the following is non-reducing
A H2Se
B H2Te
C H2S
D H2O

Answer:H2O
20 When PbO2 reacts with conc. HNO3 the gas evolved is
A NO2
B O2
C N2
D N2O

Answer:O2

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