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Free download in PDF P-Block Elements Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like IIT-JEE, NEET, AIIMS etc. These short solved questions or quizzes are provided by Gkseries.
(1)
Which statement correct about halogens?
[A]
They are all diatomic and form univalent ions
[B]
They are all capable of exhibiting several oxidation stables
[C]
They are all diatomic and form diatomic ions
[D]
They are all reducing agents
Answer: They are all diatomic and form univalent ions
(2)
Which one of the following is the strongest acid?
[A]
SO (OH)2
[B]
SO2(OH)2
[C]
ClO2(OH)
[D]
ClO3(OH)
(3)
Fluorine react with water to give :
[A]
Hydrogen fluoride and oxygen
[B]
Hydrogen fluoride and ozone
[C]
Hydrogen fluoride and oxygen fluoride
[D]
Hydrogen fluoride, oxygen and ozone
Answer: Hydrogen fluoride, oxygen and ozone
(4)
Oxidising action increases from left to right in the order:
[A]
Cl2 < Br2 < I2 < F2
[B]
Cl2 < I2 < Br2 < F2
[C]
I2 < F2 < Cl2 < Br2
[D]
I2 < Br2 < Cl2 < F2
Answer: I2 < Br2 < Cl2 < F2
(5)
The solubility of iodine in water is greatly increased by :
[A]
Adding an acid
[B]
Boiling the solution
[C]
Cooling the solution
[D]
Adding potassium iodide
Answer: Adding potassium iodide
(6)
The correct statement is :
[A]
SO2 is the anhydride of sulphurous acid
[B]
H2S is the anhydride of hydrosulphuric acid
[C]
NO2 is the anhydride of HNO3
[D]
HCL is anhydride of HCl
Answer: SO2 is the anhydride of sulphurous acid
(7)
When excess of Kl is added to copper sulphate solution:
[A]
Cuprous iodide is formed
[B]
I2 is liberated
[C]
Potassium iodide is oxidized
[D]
all
(8)
Gaseous HCl is a poor conductor of electricity while its aqueous solution is a good conductor this is because :
[A]
H2O is a good conductor of electricity
[B]
a gas cannot conduct electricity, but a liquid can
[C]
HCl gas does not obey ohm’s law; whereas the solution does
[D]
HCl ionizes in aqueous solution
Answer: HCl ionizes in aqueous solution
(9)
Which reaction yield the greatest quantity of chlorine form a given quantity of hydrochloric acid ?
[A]
Warming con, HCl with KMno2
[B]
Warming con. HCl with pbO2
[C]
Maxing conc. HCl with KMnO4
[D]
Treating beaching powder with HCl
Answer: Treating beaching powder with HCl
(10)
Iodine is placed between two liquids C6H6 and water :
[A]
It dissolve more in C6H6
[B]
It dissolve more in water
[C]
It dissolve equally in both
[D]
Does not dissolve in both
Answer: It dissolve more in C6H6
(11)
If Cl2 gas is passed in to aqueous solution of Kl containing some CCl4 and the mixture is shaken then:
[A]
Upper layer becomes violet
[B]
Lower layer becomes violet
[C]
Homogenous violet layer is formed
[D]
None of these
Answer: Lower layer becomes violet
(12)
K2[HgI4] detect the ion/group :
[A]
NH2
[B]
NO
[C]
NH4+
[D]
Cl–
(13)
Which pair give Cl2 at room temperature?
[A]
conc. HCl + KMnO4
[B]
NaCl + conc. H2SO4
[C]
NaCl + MnO2
[D]
NaCl + conc. NHO3
Answer: conc. HCl + KMnO4
(14)
Among the C – x bond (where X = Cl, Br, I) the correct bond energy order is:
[A]
C – Cl > C – Br < C– I
[B]
C – l > C – Cl > C – Br
[C]
C – Br > C – Cl > C – I
[D]
C – l > C – Br > C – CI
Answer: C – Cl > C – Br < C– I
(15)
The bonds present in N2O5 are:
[A]
Only ionic
[B]
Only covalentC
[C]
Co-valent and co-ordinate
[D]
Covalent and ionic
Answer: Co-valent and co-ordinate
(16)
Which of the following is/are paramagnetic:
[A]
Only NO2
[B]
NO2, NO
[C]
NO, NO2, N2O5
[D]
All are paramagnetic
(17)
Nitrogen (I) oxide is produced by:
[A]
Thermal decomposition of ammonium nitrate
[B]
Disproportionation of N2O4
[C]
Thermal decomposition of ammonium nitrite
[D]
none of the above
Answer: Thermal decomposition of ammonium nitrate
(18)
The gas which does not show oxidising and bleaching property:
[A]
Chlorine
[B]
Ozone
[C]
Sulphure dioxide
[D]
Nitrocellulose is formed
Answer: Nitrocellulose is formed
(19)
Dinitrogen tetroxide N2O4, is mixed anhydride because it:
[A]
Is mixture of N2O3 and N2O5
[B]
Decomposes into two oxides of nitrogen reacts
[C]
Reacts with water to form nitric acid
[D]
Reacts with water to form two acid
Answer: Decomposes into two oxides of nitrogen reacts
(20)
Fixation of nitrogen means:
[A]
Reaction of nitrogen with oxygen
[B]
Conversion of free atmospheric nitrogen into nitrogen compound
[C]
Decomposition of nitrogenous compounds to yield free nitrogen
[D]
The action of denitrifying bacteria on nitrogen compound
Answer: The action of denitrifying bacteria on nitrogen compound
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