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Free download in PDF Class 12 Chemistry Chapter 7 p Block Elements Short Questions with Answers 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 the correct oxidation state of lead
[A]
+2, +4
[B]
+1, +2
[C]
+3, +4
[D]
+4
(2)
Quartz is an example of
[A]
Chain Silicate
[B]
Sheet Silicate
[C]
Cyclic Silicate
[D]
3D network Silicate
Answer: 3D network Silicate
(3)
Which of the following elements does not form stable diatomic molecules
[A]
Iodine
[B]
Phosphorous
[C]
Nitrogen
[D]
Oxygen
(4)
HNO3 + P2O5 → A + B, A is an Oxyacid of phosphorous and B is an oxide of N. A and B respectively are
[A]
H3PO4, N2O3
[B]
HPO3, N2O3
[C]
HPO3, N2O5
[D]
H3PO3, N2O5
(5)
When heated NH3 is passed over CuO gas evolved is
[A]
N2
[B]
N2O
[C]
HNO3
[D]
NO2
(6)
When concentrated nitric acid is heated it decomposes to give
[A]
O2 and N2
[B]
NO
[C]
N2O5
[D]
NO2 and O2
(7)
Which of the following metal produces nitrous oxide with dil HNO3
[A]
Fe
[B]
Zn
[C]
Cu
[D]
Ag
(8)
Which Nitrogen trihalides is least basic
[A]
NF3
[B]
NCl3
[C]
NBr3
[D]
NI3
(9)
P4O6 reacts with water to give
[A]
H3PO3
[B]
H4P2O7
[C]
HPO3
[D]
H3PO4
(10)
Which does not form complex
[A]
N
[B]
P
[C]
As
[D]
Bi
(11)
Nitrogen is relatively inactive element because
[A]
It atom has a stable Electronic Configuration
[B]
It has low atomic radius
[C]
Its electro negativity is fairly high
[D]
Dissociation energy of 15 molecule is fairly high
Answer: Dissociation energy of 15 molecule is fairly high
(12)
Nitrogen dioxide is released by heating
[A]
Pb(NO3)2
[B]
KNO3
[C]
NaNO2
[D]
NaNO3
(13)
Concentrated nitric acid oxidizes cane sugar to
[A]
CO2 and H2O
[B]
CO and H2O
[C]
CO, CO2 and H2O
[D]
Oxalicacid and water
Answer: Oxalicacid and water
(14)
Red P can be obtained from white P by
[A]
Heating it with a catalyst in an inest atmosphere
[B]
Distilling it in an inert atmosphere
[C]
Dissolving it in carbon disulphide and crystalising
[D]
Melting it an pouring the liquid into water
Answer: Heating it with a catalyst in an inest atmosphere
(15)
When aluminium phosphide is reacted with dil H2SO4
[A]
SO2 is liberated
[B]
PH3 is evolved
[C]
H2S is evolved
[D]
H2 is evolved
(16)
Cyanamide process is used in the formation of
[A]
N2
[B]
HNO3
[C]
NH3
[D]
PH3
(17)
Which statement is wrong for NO
[A]
It is anhydride of nitrous acid
[B]
It dipole moment in 0.22D
[C]
It forms dimer
[D]
It is paramagnetic
Answer: It is anhydride of nitrous acid
(18)
Solid PCl5 exists as
[A]
PCl5
[B]
PCl4+
[C]
PCl6-
[D]
PCl4+ and PCl6-
(19)
How can you synthesise nitric oxide in the lab
[A]
Zinc with cold and dilute HNO3
[B]
Zinc with Conc. HNO3
[C]
Cu with cold and dil HNO3
[D]
Heating NH4 NO3
Answer: Cu with cold and dil HNO3
(20)
Which of the following is a cyclic phosphate
[A]
H5P3O10
[B]
H6P4O13
[C]
H5P5O15
[D]
H7P5O16
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