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

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Questions
1 Concentrated H2SO4 can not be used to prepare HBr from NaBr because it
A reduces HBr
B Oxidises HBr
C Reacts slowly
D None of above

Answer:Oxidises HBr
2 When Fluoride is heated with conc. H2SO4 & MnO2 the gas evolved is
A F2
B SF
C HF
D None

Answer:HF
3 Unlike other halogens Fluorine does not show higher oxidation states because
A It is highly electionegative
B It has no d - orbital
C Atomic radius is very small
D None of Above

Answer: It has no d - orbital
4 Which of following molecule is theoratically not possible
A OF4
B OF2
C SF4
D O2F2

Answer:OF4
5 Which one of halogen acids is liquid ?
A HF
B HCl
C HBr
D HI

Answer: HF
6 When Cl2 is passed through hot & Conc. Solution of KOH following compound is formed.
A KCl
B KClO3
C KClO2
D KClO4

Answer:KCl
7 Chlorine can remove
A Br from NaBr Sol.
B F from NaF Sol.
C Cl from NaCl Sol.
D F from CaF2 Sol.

Answer:Br from NaBr Sol.
8 Which one of following acid is weakest?
A HClO
B HBr
C HClO3
D HCl

Answer:HClO
9 Which of following will displace halogen from solution of halide?
A Br2 added to NaCl
B Cl2 added to KCl
C KCl added to NaF
D Br2 added to KI

Answer: Br2 added to KI
10 Chlorine can be manufactured from
A Electrolysis of NaCl
B Electrolysis of brine
C Electrolysis of bleaching powder
D All above

Answer: Electrolysis of brine
11 Nitric acid converts iodine to
A Iodic acid
B Hydro iodic acid
C Iodine Nitrate
D Iodine pentoxide

Answer: Iodic acid
12 In preparation of chlorine from HCl, MnO2 acts as
A Oxidising agent
B Reducing agent
C Catalytic agent
D Dehydration agent

Answer: Oxidising agent
13 Which one is anhydride of HClO4
A Cl2O
B ClO2
C Cl2O6
D Cl2O7

Answer: Cl2O7
14 In dark, which of following reacts with Hydrogen?
A Br2
B F2
C I2
D Cl2

Answer:F2
15 Electrolysis of a liquid resulted in formation of Hydrogen at cathode & Cl2 at anode. Liquid is
A Pure water
B H2SO4 Solution
C NaCl Solution
D CaCl2 Solution

Answer:NaCl Solution
16 Concentrated HNO3 reacts with I2 to give
A HI
B HOI
C HOIO2
D HOIO3

Answer: HOIO2
17 Manufacture of Bromine from sea water, the mother liquor containing bromides is treated with
A CO2
B CI2 
C I2
D SO2

Answer:CI2 
18 Formula of some fluorides are given. Which of them will combine with fluorine?
A IF5
B NaF
C CaF2
D SF5

Answer:IF5
19 Which of following oxidizes H2O to oxygen.
A Cl
B F
C Br
D I

Answer: F
20 A solution of HCl in water is good conductor while gaseous Hydrogen chloride is not . This is because
A Water is good conductor of electricity
B HCl in water ionises
C Gas can not conduct electricity but water can
D None of these

Answer:HCl in water ionises

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