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

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Questions
1 Which catalyst is used in the haber process for the manufacture of NH3
A Pt
B Fe+Mo
C CuO
D Al2O3

Answer:Fe+Mo
2 Which of the following has the highest dipole moment
A NH3
B PH3
C SbH3
D ASH3

Answer:NH3
3 Which salt can be classified as an acid salt
A Na2SO4
B BiOCl
C Pb(OH)Cl
D Na2HPO4

Answer:Na2HPO4
4 Which of the following is manufactured from the molecular nitrogen by bacteria
A NO3
B NO2
C Amino acids
D Ammonia

Answer:NO3
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

Answer: Heating NH4NO2
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

Answer: NH3
8 In an organic compound , phosphorous in estimated as
A Mg2P2O7
B Mg3(PO4)2
C H3PO4
D P2O5

Answer:Mg2P2O7
9 Producer gas is a mixture of
A CO and N2
B CO2 amd H2
C CO and H2
D CO2 and N2

Answer: CO 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

Answer: NH3
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

Answer:Phosphorous
13 Which of the following acid exist in polymeric form
A HPO3
B H4P2O7
C H3PO4
D None

Answer: HPO3
14 Dehydrated phosphorous trichloride in H2O gives
A HPO3
B H3PO4
C H3PO2
D NF3

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

Answer:NF3
16 The strongest base is
A NH3
B PH3
C AsH3
D SbH3

Answer:NH3
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

Answer:NO
20 Which of the following is the most basic oxide
A Bi2O2
B SeO2
C Al2O3
D Sb2O3

Answer:Bi2O2

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