Class 12 Chemistry Chapter 7 p Block Elements MCQs | Multiple Choice Questions (MCQs) and Answers on Class 12 Chemistry Chapter 7 p Block Elements

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Questions
1 The most efficient agent for the absorption of SO3 is
A 80% H2SO4
B 98% H2SO4
C 50% H2SO4 
D 20% H2SO4

Answer:98% H2SO4
2 In presence of moisture , SO2 can
A Act as oxidant
B Lose electron
C Gain electron
D Not act as reductant

Answer:Lose electron
3 The correct order of thermal stability of hydrogen halide.
A HI > HBr > HCl > HI
B HF > HCl > HBr > HI
C HCI < HF < HBr < HI
D HI > HCl > HF > HBr

Answer: HF > HCl > HBr > HI
4 The solubility of iodine in water increases in presence of
A Alcohol
B Chloroform
C Sodium hydroxide
D Potassium trichloride

Answer:Potassium trichloride
5 On boiling an aqueous solution of KClO3 with iodine the following is obtained
A KClO3
B KClO4
C KClO2
D KIO3

Answer:KClO3
6 Colour of iodine is disappeared by shaking it with aqueous solution of
A H2SO4
B Na2S2O3
C Na2S
D Na2SO4

Answer:Na2S
7 The stability of interhalogen compound is in order

A IF3 > UF3 > BrF3 
B BrF3 > IF3 > ClF3
C IF3 > BrF3 > ClF33
D ClF3 > IF3 > BrF3

Answer:BrF3 > IF3 > ClF3
8 Bromine is obtained on commercial scale from
A Caliche
B Carnellite
C Common Salt
D Cryolite

Answer:Carnellite
9 Chlorine was discovered by
A Davy
B Priestley
C Ratherlford
D Sheele

Answer:Davy
10 Bromine is liberated when aqueous solution of potassium bromide is treated with
A Cl
B I2
C Dilute H2SO4
D SO2

Answer:Cl
11 Chlorine reacts under various conditions with sodium hydroxide to give
A Sodium Chloride
B Sodium hypochlorite
C Sodium chlorate
D All of these

Answer:All of these
12 Br2 gas turns starch iodide paper
A Blue
B Red
C Colourless
D Yellow

Answer: Blue
13 Which of following is weakest acid?
A HF
B HCl
C HBr
D HI

Answer: HF
14 Deacon’s process is used in manufacture of
A Bleaching powder
B Sulphonic acid
C Nitric acid
D Chlorine

Answer: Chlorine
15 Which of following is correct?
A Iodine is solid
B Chlorine is insoluble in water
C Iodine is more reactive than bromine
D Bromine is more reactive than chlorine

Answer:Iodine is solid
16 Sea water is employed as a source of manufacture of
A F
B I
C Br
D Cl

Answer: I
17 Which is most reactive halogen
A Cl2
B Br2
C I2
D F2

Answer: F2
18 Which of following represents clear electro positive properties
A F
B Cl
C Br
D I

Answer:I
19 Which of following represents outermost shell of halogens
A S2P3
B S2P6
C S2P4
D S2P5

Answer: S2P5
20 Most activeness of fluorine is due to
A F-F bond has less energy
B F2 is gas at normal temp
C Its e - affinity is max
D None of above

Answer:F-F bond has less energy

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