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Free download in PDF Class 12 Chemistry Chapter 7 p Block Elements Very Short 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 NEET, AIIMS, JIPMER etc. These short solved questions or quizzes are provided by Gkseries./p>
(1)
Which catalyst is used in the haber process for the manufacture of NH3
[A]
Pt
[B]
Fe+Mo
[C]
CuO
[D]
Al2O3
(2)
Which of the following has the highest dipole moment
[A]
NH3
[B]
PH3
[C]
SbH3
[D]
ASH3
(3)
Which salt can be classified as an acid salt
[A]
Na2SO4
[B]
BiOCl
[C]
Pb(OH)Cl
[D]
Na2HPO4
(4)
Which of the following is manufactured from the molecular nitrogen by bacteria
[A]
NO3
[B]
NO2
[C]
Amino acids
[D]
Ammonia
(5)
Which of the following Tendencies remains unchanged on going down in the nitrogen family
[A]
Highest Oxi. State
[B]
Non - metallic character
[C]
Stability of hydrides
[D]
Physical state
Answer: Highest Oxi. State
(6)
(NH4)2 Cr2O7 on heating liberates a gas. The same gas will be obtained by
[A]
Heating NH4NO2
[B]
Heating NH4NO3
[C]
Treating H2O2 and NaNO2
[D]
Treating MF3N2 with H2O
(7)
When plants and animals decay, the organic N is converted in to inorganic N. The inorganic N is in the form is
[A]
NH3
[B]
Elements of N
[C]
Nitrates
[D]
Nitrides
(8)
In an organic compound , phosphorous in estimated as
[A]
Mg2P2O7
[B]
Mg3(PO4)2
[C]
H3PO4
[D]
P2O5
(9)
Producer gas is a mixture of
[A]
CO and N2
[B]
CO2 amd H2
[C]
CO and H2
[D]
CO2 and N2
(10)
Ammonium nitrate decomposes on heating in to
[A]
NH3 and HNO3
[B]
Nitrous oxide and H2O
[C]
N, H, O3
[D]
Nitric Oxide, NO2, H2
Answer: Nitrous oxide and H2O
(11)
Non - Combustible hydride is
[A]
NH3
[B]
PH3
[C]
ASH3
[D]
SbH3
(12)
The element which catches fire in air at 30°C and is stored under water is
[A]
Calcium
[B]
Sodium
[C]
Phosphorous
[D]
Zinc
(13)
Which of the following acid exist in polymeric form
[A]
HPO3
[B]
H4P2O7
[C]
H3PO4
[D]
None
(14)
Dehydrated phosphorous trichloride in H2O gives
[A]
HPO3
[B]
H3PO4
[C]
H3PO2
[D]
NF3
(15)
Which of the following is not hydrolysed
[A]
AsCl3
[B]
PF3
[C]
SbCl3
[D]
NF3
(16)
The strongest base is
[A]
NH3
[B]
PH3
[C]
AsH3
[D]
SbH3
(17)
The cyaide ion, CN–, N2 are iso electronic. But in contrast to CN–, N2 is chemically inert because of
[A]
Low bond energy
[B]
Absence of bond polarity
[C]
Unsymmetrical electron distribution
[D]
Presence of more number of electron in bonding orbilats
Answer: Presence of more number of electron in bonding orbilats
(18)
When lighting flash is produced, which gas may form
[A]
Nitrous Oxide
[B]
Nitric Oxide
[C]
Dinitrogen in oxide
[D]
Nitrogen pentoxide
Answer: Nitrogen pentoxide
(19)
A mixture of ammonia and air at about 800°C in the presence of Pt gauze forms
[A]
N2O
[B]
NO
[C]
NH2OH
[D]
N2O3
(20)
Which of the following is the most basic oxide
[A]
Bi2O2
[B]
SeO2
[C]
Al2O3
[D]
Sb2O3
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