Class 12 Chemistry Chapter 7 p Block Elements MCQs | Class 12 Chemistry Chapter 7 p Block Elements Short Questions with Answers

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Questions
1 Which is the correct oxidation state of lead
A +2, +4
B +1, +2
C +3, +4
D +4

Answer:+2, +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

Answer:Phosphorous
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

Answer:HPO3, N2O5
5 When heated NH3 is passed over CuO gas evolved is
A N2
B N2O
C HNO3
D NO2

Answer: N2
6 When concentrated nitric acid is heated it decomposes to give
A O2 and N2
B NO
C N2O5
D NO2 and O2

Answer: NO2 and O2
7 Which of the following metal produces nitrous oxide with dil HNO3
A Fe
B Zn
C Cu
D Ag

Answer: Zn
8 Which Nitrogen trihalides is least basic
A NF3
B NCl3
C NBr3
D NI3

Answer:NF3
9 P4O6 reacts with water to give
A H3PO3
B H4P2O7
C HPO3
D H3PO4

Answer:H3PO3
10 Which does not form complex
A N
B P
C As
D Bi

Answer: N
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

Answer: Pb(NO3)2
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

Answer:PH3 is evolved
16 Cyanamide process is used in the formation of
A N2
B HNO3
C NH3
D PH3

Answer:NH3
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-

Answer: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

Answer:H5P5O15

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