Set of Important MCQs on the Chemistry of Nitrogen And Phosphorus in inorganic chemistry for the preparation of tests.
Hydrolysis of PCl3 gives
- HзPO3
- H4P2O6
- HзPO2
- H4P207
Question’s Answer:HзPO3
Hyrolysis of PCl5 gives
- H4P2O6
- H3PO4
- HзPO2
- H4P207
Question’s Answer:H3PO4
What is the common oxidation state of elements of group V A?
- +5
- +3
- -3
- Any of A, B, and C
Question’s Answer:Any of A, B, and C
Which of the mentioned molecule is diatomic?
- Phosphorous
- Nitrogen
- Arsenic
- Antimony
Question’s Answer: Nitrogen
Artificial nitrogen fixation may occur by the formation of ________ .
- Nitric acid
- Nitrates
- Ammonia
- Any of A, B, and C
Question’s Answer:Any of A, B, and C
Which is a colorless gas with pleasant odor and sweet taste?
- N2O3
- N₂O
C: NO
- N2O4
Question’s Answer:N₂O
Which of the mentioned statements is not true about this group?
- Electronegativity increases down the groupc
- Metallic character increases down the group
- There is steady increase in atomic radii down the group
- There is an increase in hardness from P to Bi
Question’s Answer: Electronegativity increases down the group
Group VA of the periodic table consist of how many elements?
- 3
- 5
- 7
- 2
Question’s Answer: 5
Which elements are non-metals?
- N & P
- As & Sb
- Sb & Bi
- Ba & Bi
Question’s Answer: N & P
Which of the mentioned members are solid in nature?
- P
- Sb
- As
- All of A, B, and C
Question’s Answer:All of A, B, and C
Polyphosphates are helpful and used as water softening agents because they
- form soluble complexes with anionic species
- form soluble complexes with cationic species
- Precipitate cationic species
- Precipitate anionic species
Question’s Answer: form soluble complexes with cationic species
Which of the mentioned elements shows least ionization potential?
- As
- Bi
- Sb
- N
Question’s Answer: Bi
Nitric acid is helpful and used in the manufacturing of
- Artificial silk
- Drugs
- Dyes
- All of A, B, and C
Question’s Answer: All of A, B, and C
Among oxides of nitrogen, all are gases excluding ___ .
- N2O5
- N2O
- NO
- N2O3
Question’s Answer:N2O5
In Ostwald’s process of manufacturing nitric acid a mixture of ammonia gas with air is maintained with ________ ratio.
- 1:4
- 1:8
- 2:4
- 3:5
Question’s Answer:1:8
Acid rain effects _____.
- Aquatic life
- Crops
- Human being
- All of A, B, and C
Question’s Answer: All of A, B, and C
What is the Formula of orthophosphoric acid?
- H3P2O5
- H3PO3
- H3PO2
- H3PO4
Question’s Answer:H3PO4
What is the % purity of commercial phosphoric acid?
- 82.98%
- 37.0%
- 98.2%
- 90.12%
Question’s Answer:82.98%
Urea belongs to what kind of fertilizer?
- Nitrogen fertilizer
- Potash fertilizer
- Phosphorous fertilizer
- Complete fertilizer
Nitrogen fertilizer
In urea the amount of nitrogen is
- 16.0%
- 82.0%
- 33.0%
- 21.0%
Question’s Answer:16.0%
Ammonia is utilized for __________.
- Manufacture of ammonium sulphate
- Oxidation to nitric acid
- Manufacture of urea
- All of A, B, and C
Question’s Answer: All of A, B, and C
Which of the mentioned is a strong base?
- AsH3
- SbH3
- PH3
- NH3
Question’s Answer:NH3
Nitrogen (Ng) is relatively unreactive, because
- Its electronegativity is high
- Its atomic radius is small
- Its dissociation energy is large
- It is the first element of group 15
Question’s Answer: Its dissociation energy is large
Phosphorus normally exhibit a covalence of ___ and ___ .
- +3 and +5
- +2 and +3
- +3 and +4
- +1 and +2
Question’s Answer:+3 and +5
Which of the mentioned elements occurs in Free State in nature?
- P
- Sn
- N
- Sb
Question’s Answer: N
Which of the mentioned pentahalides is not formed?
- NF3
- PF3
- AsF3
- BiF3
Question’s Answer:PF3
The accurate order of thermal stabilities of hydrides of group 15 is
- NH3 > PH3 > AsH3 > BiH3 > SbH3
- NH3 > PH3 > AsH3 > SbH3 > BiH3
- NH3 < PH3 < SbH3 > AsH3 > BiH3
- BiH3 > SbH3 > AsH3 > PH3 > NH3
Question’s Answer:NH3 > PH3 > AsH3 > SbH3 > BiH3
Arrange the hydrides of group 15 in the accurate order of reducing nature.
- NH3 < PH3 < AsH3 < SbH3 < BiH3
- NH3 > Ph3 > AsH3 > SbH3 > BiH3
- PH3 < AsH3 < SbH3 < BiH3 < NH3
- PH3 > AsH3 > SbH3 > BiH3 > NH3
Question’s Answer:NH3 < PH3 < AsH3 < SbH3 < BiH3
Which of the mentioned oxides of nitrogen is a colored gas?
- NO2
- NO
- N2O
- N2O5
Question’s Answer:NO2
The basic strength of hydrides of group 15 elements vary in the following order
- BiH3 > NH3 > PH3 > AsH3 > SbH3c
- PH3 > NH3 > AsH3 > SbH3 > BiH3
- NH3 > PH3 > AsH3 > SbH3 > BiH3
- NH3 > PH3 > SbH3 > AsH3 > BiH3
Question’s Answer:NH3 > PH3 > AsH3 > SbH3 > BiH3
Which of following trihalides of nitrogen behaves as the weakest base?
- NI3
- NCI3
- NBr3
- NF3
Question’s Answer:NF3
Which trihalide is not hydrolyzed by water?
- NF3
- NCI3
- PCl3
- AsCl3
Question’s Answer:NF3
Which catalyst is helpful and used in Contact process?
- SO3
- FeO
- N2O3
- V₂O5
Question’s Answer:V₂O5
Select the false statement.
- In PCl5, P atom is sp³d-hybridized and has trigonal bipyramidal geometry.
- PCl5 on hydrolysis forms phosphoric acid
- PCl5 acts as Lewis acid
- In PCl5, the axial chlorine atoms are closer to central ‘P’ atom than equatorial chlorine atoms
Question’s Answer:In PCl5, the axial chlorine atoms are closer to central ‘P’ atom than equatorial chlorine atoms
Arrange the oxides of group 15 elements in decreasing order of their acidity.
- N2O5 > P2O5 > As2O5 > Sb2O5 > Bi2O5
- Bi2O5 > Sb2O5 > As2O5 > P2O5 > N2O5
- P2O5 > N2O5 > As2O5 > Sb2O5 > Bi2O5
- N2O5 > Bi2O5 > P2O5 > As2O5 > Sb2O5
Question’s Answer:N2O5 > P2O5 > As2O5 > Sb2O5 > Bi2O5
In Which of the mentioned compounds the oxidation state of N is +1?
- N2O2
- NO2
- N2O4
- NO
Question’s Answer:N2O
Which of the mentioned acids possesses oxidizing, reducing and complex forming properties?
- H₂SO4
- HCI
- HNO3
- HNO₂
Question’s Answer: HNO₂
Which of the mentioned elements of group 15 is a typical metal?
- P
- Bi
- Sb
- As
Question’s Answer:Bi
Which of the mentioned elements display maximum tendency to form pр multiple bonds with itself and with carbon and oxygen?
- Bi
- P
- As
- N
Question’s Answer: N
Which of the mentioned acids have P atom ‘exits in lower oxidation state?
- H3PO4
- H3PO2
- HзPO3
- H4P207
Question’s Answer:H3PO2
Which of the mentioned does not form stable diatomic molecule?
- Nitrogen
- Hydrogen
- Phosphorus
- Oxygen
Question’s Answer: Phosphorus
The oxidation states shown by phosphorus is/are
- -3
- +3
- +3 and +5
- -3, +3 and +5
Question’s Answer:-3, +3 and +5
White phosphorus is usually kept under
- Ammonia liquor
- Cold water
- Ethanol
- Kerosene
Question’s Answer: Cold water
Which of the mentioned statement is true?
- PH3 is more basic than ammonia
- NH3 is amphoteric and PH3 is basic
- PH3 is equally basic as ammonia
- PH3 is less basic than ammonia
Question’s Answer:PH3 is less basic than ammonia
Nitric acid can be prepared by
- from sodium nitrate and sulfuric acid
- Birkland tyde process
- Ostwald’s process
- All of A, B, and C
Question’s Answer: All of A, B, and C
Ostwald’s process for the manufacture HNO, involves the
- oxidation of N₂ to NO
- oxidation of NH3 to NO in presence PU/Rh catalyst
- combination of N2 and O2
- combination of H2O and N₂O5
Question’s Answer: oxidation of NH3 to NO in presence PU/Rh catalyst
The strongest acid is
- HNO3
- HNO2
- H₂N2O2
- Any of these
Question’s Answer:HNO3
Phosphorus has the oxidation state of +3 in
- Orthophosphoric acid
- Hypophosphoric acid
- Orthophosphorus acid
- Metaphosphoric acid
Question’s Answer: Orthophosphorus acid
The Ostwald process is the main method for the manufacture of nitric acid. In the first step in this process is
- Nitrogen and hydrogen react to form NH3
- Ammonia is burned in O2 to generate N2 and H2O
- Nitrogen and oxygen react to form NO2
- Ammonia is burned with O2 to generate NO and H2O
Question’s Answer: Ammonia is burned with O2 to generate NO and H2O
Which of the mentioned oxyacids of P contains maximum no of P-H bonds?
- H3PO4
- H3PO3
- H3P207
- H3PO2
Question’s Answer: H3PO2
Which of the mentioned acids have P atom exits in highest oxidation state?
- H4P2O7
- H3PO3
- H3PO₂
- H4P2O6
Question’s Answer: H4P2O7
Hydrolysis of P4O10 with excess of water gives _____.
- H4P2O6
- H3PO4
- HзPO2
- H4P207
Question’s Answer: H3PO4
Which of the mentioned elements shows catenation?
- As
- Bi
- Sb
- N
Question’s Answer:N
Aqua regia is made by dissolving a mixture of HNO3 and HCl with ____ ratio.
- 1:3
- 2:1
- 1:2
- 1:1
Question’s Answer:1:3
Nitric acid has the property of __ .
- Reducing
- Nitrating
- Redoxing
- Any of these
Question’s Answer: Nitrating
Nitric acid is helpful and used in manufacturing of _____ .
- Fertilizer
- H2SO4
- Explosive
- All of A, B, and C
Question’s Answer: All of A, B, and C
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