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Free download in PDF GK Type Questions with 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)
Which is not easily soluble in water
[A]
H2
[B]
O2
[C]
SO2
[D]
CO2
(2)
The molecular formula of sulphur is
(A) (B) (C) (D)
[A]
S
[B]
S2
[C]
S4
[D]
S8
(3)
All the elements of oxygen family are
[A]
Non - metal
[B]
Matalloids
[C]
Radioactive
[D]
Plymorphic
(4)
The triatomic species of element oxygen is known as
[A]
Azone
[B]
Polyzone
[C]
Trizone
[D]
Ozone
(5)
Which of the following acts as pickling agent
[A]
HNO3
[B]
HCl
[C]
H2SO4
[D]
HNO2
(6)
Which of the following is no suitable for use in dasiccator to dry substance
[A]
conc H2SO4
[B]
Na2SO4
[C]
CaC12
[D]
P4O10
(7)
The catalyst used in manufacture of by contact process
[A]
Al2O3
[B]
Cr2O3
[C]
V2O3
[D]
MnO2
(8)
Which of the following is the best scientific method to test presence of water in a liquid
[A]
Taste
[B]
Smell
[C]
use of litmus paper
[D]
use of onhydrous CaSO4
Answer: use of onhydrous CaSO4
(9)
Which of the following sulphate is insoluble in water
[A]
CaSO4
[B]
CdSO4
[C]
PbSO4
[D]
Bi2(SO4)3
(10)
When sulphur is boiled with Na2SO3 solution, the compound formed is
[A]
Sodium Sulphide
[B]
Sodium Sulphate
[C]
Sodium persulphate
[D]
Sodium thiosulphate
Answer: Sodium thiosulphate
(11)
Number of unpaired electrons in sulphur is
(12)
H2S reacts with O2 in restricted supply of O2 to form
[A]
H2O + S
[B]
H2O + SO2
[C]
H2O + SO3
[D]
H2SO4 + S
(13)
Which of the following mixlure is chromic acid
[A]
K2Cr2O7 and Con. H2SO4
[B]
K2Cr2O7 and HCl
[C]
K2SO4 and Con. H2SO4
[D]
H2SO4 and HCl
Answer: K2Cr2O7 and Con. H2SO4
(14)
Among KO2, NO2- , BaO2 and NO2+ unpaired electron is present in
[A]
NO2+ and BaO2
[B]
KO2 and BaO2
[C]
KO2
[D]
BaO2
(15)
Which of the element of the oxygen family is most poisonous to human race
[A]
O
[B]
S
[C]
Se
[D]
None
(16)
Super phosphate is the mixture of
[A]
Calcium phosphate and H2SO4
[B]
Sodium phosphate and H2SO4
[C]
Potassium phosphate and H2SO4
[D]
None
Answer: Calcium phosphate and H2SO4
(17)
Which of the following dissociates to give H+ easily
[A]
H2O
[B]
H2S
[C]
H2Te
[D]
H2Se
(18)
H2SO4 reacts with PCl5 to give
[A]
Thoinyl chloride
[B]
Sulphur monochloride
[C]
Sulphur chloride
[D]
Sulphur utrachloride
(19)
Among H2O, H2S, H2Se and H2Te the one with highest boiling point
[A]
H2O
[B]
H2Te
[C]
H2S
[D]
H2Se
(20)
Which of the following is used in artificial respiration
[A]
O2 + CO2
[B]
O2 + CO
[C]
O2 + H2
[D]
All of these
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