Class 12 Chemistry Chapter 7 p Block Elements MCQs | GK Type Questions and Answers on Class 12 Chemistry Chapter 7 p Block Elements

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Questions
1 Aquaregia is
A 1:3 conc. HNO3 and conc. HCl
B 1:2 conc. HNO3 and conc. HCl
C 3:1 conc. HNO3 and conc. HCl
D 2:1 conc. HNO3 and conc. HCl

Answer:1:3 conc. HNO3 and conc. HCl
2 Which of the following hydrides is least stable
A AsH3
B SbH3
C NH3
D PH3

Answer:SbH3
3 The most stable hydride is
A NH3
B PH3
C AsH3
D SbH3

Answer:NH3
4 Which has the lowest boiling point
A NH3
B PH3
C AsH3
D SbH3

Answer:PH3
5 Which is the most explosive
A NCl3
B PCl3
C AsCl3
D All

Answer: NCl3
6 The most acidic is
A AS2O3
B P2O3
C Sb2O3
D Bi2O3

Answer: P2O3
7 Non-existing compound is
A PH4I
B As2O3
C SbCl2
D As2H3

Answer: SbCl2
8 Pure N2 gas is obtained from
A NH3 + NaNO2
B NH4Cl + NaNO2
C N2O + Ca
D (NH4)2Cr2O7

Answer:NH4Cl + NaNO2
9 Pure nitrogen can be prepared from
A NH4OH
B Ca3N2
C NH4NO2
D Ba(NO3)2

Answer: NH4NO2
10 NO2 is released by heating
A Pb(NO3)2
B KNO3
C NaNO2
D NaNO3

Answer: Pb(NO3)2
11 Which of the following is neutral
A N2O5
B N2O3
C N2O4
D N2O

Answer:N2O5
12 Which of the following is acidic
A NH3
B N2H4
C N2H2
D N3H

Answer:N3H
13 Laughing gas is prepared by heating
A NH4Cl
B (NH4)2SO4
C NH4Cl + NaNO3
D NH4NO3

Answer: NH4NO3
14 P4O6 reacts with water to give
A H3PO3
B H4P2O7
C HPO3
D H3PO4

Answer:H3PO3
15 Electrolysis temperature is maximum
A AsH3
B NH3
C PH3
D SbH3

Answer:NH3
16 Which of the following is not hydrolysed
A AsCl3
B PF3
C SbCl3
D NF3

Answer:NF3
17 On adding H2O to BiCl3 solution in HCl, the compound produced is
A Bi2O3
B Bi(OH)3
C BiOCl
D BiOCl2

Answer:BiOCl
18 N, P , As, Sb , Bi elements belong to
A VA Group
B IV A Group
C VII A Group
D Hg(OH)2

Answer:VA Group
19 Which of the following elements occur free in nature
A Nitrogen
B Phosphorus
C Arsenic
D Antimony

Answer:Nitrogen
20 Which of the following elements of group VA does not show allotropy
A N
B Bi
C P
D As

Answer:Bi

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