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

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Questions
1 Carbogen is
A Pureform of C
B COCl2
C Mixture of CO and CO2
D O2 & CO2

Answer:O2 & CO2
2 The products of the chemical reaction between Na2S2O3, Cl2 and H2O are
A S+ HCl + Na2S
B S + HCl + Na2SO4
C S + HCl + Na2SO3
D S + NaCCO3 + H2O

Answer:S + HCl + Na2SO4
3 The incorrect statement among the following is
A C60 is an allotropic form of carbon
B O3 is an allotropic form of oxygen
C S8 is only allotropic form of sulphur
D Red phosphorous is more stable in air than while phosphorous

Answer:S8 is only allotropic form of sulphur
4 Hypo is used in photography because of its
A Reducing behavior
B Oxidising behavior
C Complex forming behavior
D Reaction with light

Answer:Complex forming behavior
5 Aqueous solutions of H2S and SO2 when mixed together yield
A Sulphur and water
B Sulphur trioxide and water
C Hydrogen peroxide and sulphur
D Hydrogen and sulphurous acid

Answer: Sulphur and water
6 An example of a neutral oxide is
A No
B CO2
C CaO
D ZnO

Answer: No
7 Which of the following is used to absorb sulphur dioxide
A conc H2SO4
B KOH Solution
C Water
D Anhydrous CaCl2

Answer: KOH Solution
8 When SO2 is passed through acidified K2Cr2O7 solution
A Solution turns blue
B Solution decolourizes
C SO2 is reduced
D Green Cr2(SO4)3 is formed

Answer:Green Cr2(SO4)3 is formed
9 Which of the following is oxidized by SO2
A Mg
B K2Cr2O7
C KMnO4
D All

Answer: Mg
10 A salt of sulphurous acid is called
A Sulphate
B Sulphurate
C Sulphite
D Sulphid

Answer: Sulphite
11 The final acid obtained during the manufacture of H2SO4 by contact process
A H2SO4(conc.)
B H2SO4(dil)
C H2SO4
D H2S2O7

Answer:H2S2O7
12 Which compound acts as an oxidizing as well as reducing agent
A SO2
B MnO2
C Al2O3
D CrO3

Answer:SO2
13 Bleaching action of SO2 is due to
A Reduction
B Oxidisation(oxide)
C Hydrolysis
D Acidic nature

Answer: Reduction
14 About H2SO4 which is incorrect
A Reducing agent
B Dehydrating agent
C Sulphonating agent
D Highly Viscous

Answer:Reducing agent
15 In the reaction
2Ag + 2H2SO4 → Ag2 SO4 + 2H2O + SO2, H2SO4 acts as
A Reducing agent
B Oxidising agent
C Catalytic agent
D Dehydrating agent

Answer:Oxidising agent
16 Which element is found in free state
A I
B S
C Ur
D Ag

Answer:S
17 In the preparation of sulphuric acid, V2O5 is used is the reaction, which is
A S + O2 → SO2 
B 2SO2 + O2 →2SO3
C SO2 + H2O → H2SO4
D N2 + 3H2 → 2NH3

Answer:2SO2 + O2 →2SO3
18 Point out of in which of the following properties of oxygen differs from the rest of the members of its family (Group - VIA)
A High value of ionization energy
B Oxydation state (2,4,6)
C Polymorphism
D Formation of hydrides

Answer:Oxydation state (2,4,6)
19 Ozone turns trimethyl paper
A Green
B Violet
C Red
D Black

Answer:Violet
20 No of atoms in one molecules of sulphur is
A 8
B 4
C 3
D 5

Answer:8

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