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Free download in PDF General Knowledge Questions 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)
Carbogen is
[A]
Pureform of C
[B]
COCl2
[C]
Mixture of CO and CO2
[D]
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
(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
(7)
Which of the following is used to absorb sulphur dioxide
[A]
conc H2SO4
[B]
KOH Solution
[C]
Water
[D]
Anhydrous CaCl2
(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
(10)
A salt of sulphurous acid is called
[A]
Sulphate
[B]
Sulphurate
[C]
Sulphite
[D]
Sulphid
(11)
The final acid obtained during the manufacture of H2SO4 by contact process
[A]
H2SO4(conc.)
[B]
H2SO4(dil)
[C]
H2SO4
[D]
H2S2O7
(12)
Which compound acts as an oxidizing as well as reducing agent
[A]
SO2
[B]
MnO2
[C]
Al2O3
[D]
CrO3
(13)
Bleaching action of SO2 is due to
[A]
Reduction
[B]
Oxidisation(oxide)
[C]
Hydrolysis
[D]
Acidic nature
(14)
About H2SO4 which is incorrect
[A]
Reducing agent
[B]
Dehydrating agent
[C]
Sulphonating agent
[D]
Highly Viscous
(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
(16)
Which element is found in free state
[A]
I
[B]
S
[C]
Ur
[D]
Ag
(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
(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
(20)
No of atoms in one molecules of sulphur is
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