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Free download in PDF GK Type 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)
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
(3)
The most stable hydride is
[A]
NH3
[B]
PH3
[C]
AsH3
[D]
SbH3
(4)
Which has the lowest boiling point
[A]
NH3
[B]
PH3
[C]
AsH3
[D]
SbH3
(5)
Which is the most explosive
[A]
NCl3
[B]
PCl3
[C]
AsCl3
[D]
All
(6)
The most acidic is
[A]
AS2O3
[B]
P2O3
[C]
Sb2O3
[D]
Bi2O3
(7)
Non-existing compound is
[A]
PH4I
[B]
As2O3
[C]
SbCl2
[D]
As2H3
(8)
Pure N2 gas is obtained from
[A]
NH3 + NaNO2
[B]
NH4Cl + NaNO2
[C]
N2O + Ca
[D]
(NH4)2Cr2O7
(9)
Pure nitrogen can be prepared from
[A]
NH4OH
[B]
Ca3N2
[C]
NH4NO2
[D]
Ba(NO3)2
(10)
NO2 is released by heating
[A]
Pb(NO3)2
[B]
KNO3
[C]
NaNO2
[D]
NaNO3
(11)
Which of the following is neutral
[A]
N2O5
[B]
N2O3
[C]
N2O4
[D]
N2O
(12)
Which of the following is acidic
[A]
NH3
[B]
N2H4
[C]
N2H2
[D]
N3H
(13)
Laughing gas is prepared by heating
[A]
NH4Cl
[B]
(NH4)2SO4
[C]
NH4Cl + NaNO3
[D]
NH4NO3
(14)
P4O6 reacts with water to give
[A]
H3PO3
[B]
H4P2O7
[C]
HPO3
[D]
H3PO4
(15)
Electrolysis temperature is maximum
[A]
AsH3
[B]
NH3
[C]
PH3
[D]
SbH3
(16)
Which of the following is not hydrolysed
[A]
AsCl3
[B]
PF3
[C]
SbCl3
[D]
NF3
(17)
On adding H2O to BiCl3 solution in HCl, the compound produced is
[A]
Bi2O3
[B]
Bi(OH)3
[C]
BiOCl
[D]
BiOCl2
(18)
N, P , As, Sb , Bi elements belong to
[A]
VA Group
[B]
IV A Group
[C]
VII A Group
[D]
Hg(OH)2
(19)
Which of the following elements occur free in nature
[A]
Nitrogen
[B]
Phosphorus
[C]
Arsenic
[D]
Antimony
(20)
Which of the following elements of group VA does not show allotropy
[A]
N
[B]
Bi
[C]
P
[D]
As
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