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Free download in PDF Multiple Choice Questions (MCQs) and Answers on Class 12 Chemistry Chapter 7 p Block Elements for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like NEET, AIIMS, JIPMER etc. These short solved questions or quizzes are provided by Gkseries./p>
(1)
The most efficient agent for the absorption of SO3 is
[A]
80% H2SO4
[B]
98% H2SO4
[C]
50% H2SO4
[D]
20% H2SO4
(2)
In presence of moisture , SO2 can
[A]
Act as oxidant
[B]
Lose electron
[C]
Gain electron
[D]
Not act as reductant
(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
(6)
Colour of iodine is disappeared by shaking it with aqueous solution of
[A]
H2SO4
[B]
Na2S2O3
[C]
Na2S
[D]
Na2SO4
(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
(9)
Chlorine was discovered by
[A]
Davy
[B]
Priestley
[C]
Ratherlford
[D]
Sheele
(10)
Bromine is liberated when aqueous solution of potassium bromide is treated with
[A]
Cl
[B]
I2
[C]
Dilute H2SO4
[D]
SO2
(11)
Chlorine reacts under various conditions with sodium hydroxide to give
[A]
Sodium Chloride
[B]
Sodium hypochlorite
[C]
Sodium chlorate
[D]
All of these
(12)
Br2 gas turns starch iodide paper
[A]
Blue
[B]
Red
[C]
Colourless
[D]
Yellow
(13)
Which of following is weakest acid?
[A]
HF
[B]
HCl
[C]
HBr
[D]
HI
(14)
Deacon’s process is used in manufacture of
[A]
Bleaching powder
[B]
Sulphonic acid
[C]
Nitric acid
[D]
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
(16)
Sea water is employed as a source of manufacture of
[A]
F
[B]
I
[C]
Br
[D]
Cl
(17)
Which is most reactive halogen
[A]
Cl2
[B]
Br2
[C]
I2
[D]
F2
(18)
Which of following represents clear electro positive properties
[A]
F
[B]
Cl
[C]
Br
[D]
I
(19)
Which of following represents outermost shell of halogens
[A]
S2P3
[B]
S2P6
[C]
S2P4
[D]
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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