Nitrogen and Phosphorus MCQs [Chemistry]

By: Prof. Dr. Fazal Rehman | Last updated: February 3, 2024

Set of Important MCQs on the Chemistry of Nitrogen And Phosphorus in inorganic chemistry for the preparation of tests.

Hydrolysis of PCl3 gives

  1. HзPO3
  2. H4P2O6
  3. HзPO2
  4. H4P207

Question’s Answer:HзPO3

Hyrolysis of PCl5 gives

  1. H4P2O6
  2. H3PO4
  3. HзPO2
  4. H4P207

Question’s Answer:H3PO4

What is the common oxidation state of elements of group V A?

  1. +5
  2. +3
  3. -3
  4. Any of A, B, and C

Question’s Answer:Any of A, B, and C

Which of the mentioned molecule is diatomic?

  1. Phosphorous
  2. Nitrogen
  3. Arsenic
  4. Antimony

Question’s Answer: Nitrogen

Artificial nitrogen fixation may occur by the formation of ________ .

  1. Nitric acid
  2. Nitrates
  3. Ammonia
  4. 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?

  1. N2O3
  2. N₂O

C: NO

  1. N2O4

Question’s Answer:N₂O

Which of the mentioned statements is not true about this group?

  1. Electronegativity increases down the groupc
  2. Metallic character increases down the group
  3. There is steady increase in atomic radii down the group
  4. 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?

  1. 3
  2. 5
  3. 7
  4. 2

Question’s Answer: 5

Which elements are non-metals?

  1. N & P
  2. As & Sb
  3. Sb & Bi
  4. Ba & Bi

Question’s Answer: N & P

Which of the mentioned members are solid in nature?

  1. P
  2. Sb
  3. As
  4. 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

  1. form soluble complexes with anionic species
  2. form soluble complexes with cationic species
  3. Precipitate cationic species
  4. Precipitate anionic species

Question’s Answer: form soluble complexes with cationic species

Which of the mentioned elements shows least ionization potential?

  1. As
  2. Bi
  3. Sb
  4. N

Question’s Answer: Bi

Nitric acid is helpful and used in the manufacturing of

  1. Artificial silk
  2. Drugs
  3. Dyes
  4. All of A, B, and C

Question’s Answer: All of A, B, and C

Among oxides of nitrogen, all are gases excluding ___ .

  1. N2O5
  2. N2O
  3. NO
  4. 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. 1:4
  2. 1:8
  3. 2:4
  4. 3:5

Question’s Answer:1:8

Acid rain effects _____.

  1. Aquatic life
  2. Crops
  3. Human being
  4. All of A, B, and C

Question’s Answer: All of A, B, and C

What is the Formula of orthophosphoric acid?

  1. H3P2O5
  2. H3PO3
  3. H3PO2
  4. H3PO4

Question’s Answer:H3PO4

What is the % purity of commercial phosphoric acid?

  1. 82.98%
  2. 37.0%
  3. 98.2%
  4. 90.12%

Question’s Answer:82.98%

Urea belongs to what kind of fertilizer?

  1. Nitrogen fertilizer
  2. Potash fertilizer
  3. Phosphorous fertilizer
  4. Complete fertilizer

Nitrogen fertilizer

In urea the amount of nitrogen is

  1. 16.0%
  2. 82.0%
  3. 33.0%
  4. 21.0%

Question’s Answer:16.0%

Ammonia is utilized for  __________.

  1. Manufacture of ammonium sulphate
  2. Oxidation to nitric acid
  3. Manufacture of urea
  4. All of A, B, and C

Question’s Answer: All of A, B, and C

Which of the mentioned is a strong base?

  1. AsH3
  2. SbH3
  3. PH3
  4. NH3

Question’s Answer:NH3

Nitrogen (Ng) is relatively unreactive, because

  1. Its electronegativity is high
  2. Its atomic radius is small
  3. Its dissociation energy is large
  4. It is the first element of group 15

Question’s Answer: Its dissociation energy is large

Phosphorus normally exhibit a covalence of ___ and  ___ .

  1. +3 and +5
  2. +2 and +3
  3. +3 and +4
  4. +1 and +2

Question’s Answer:+3 and +5

Which of the mentioned elements occurs in Free State in nature?

  1. P
  2. Sn
  3. N
  4. Sb

Question’s Answer: N

Which of the mentioned pentahalides is not formed?

  1. NF3
  2. PF3
  3. AsF3
  4. BiF3

Question’s Answer:PF3

The accurate order of thermal stabilities of hydrides of group 15 is

  1. NH3 > PH3 > AsH3 > BiH3 > SbH3
  2. NH3 > PH3 > AsH3 > SbH3 > BiH3
  3. NH3 < PH3 < SbH3 > AsH3 > BiH3
  4. 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.

  1. NH3 < PH3 < AsH3 < SbH3 < BiH3
  2. NH3 > Ph3 > AsH3 > SbH3 > BiH3
  3. PH3 < AsH3 < SbH3 < BiH3 < NH3
  4. PH3 > AsH3 > SbH3 > BiH3 > NH3

Question’s Answer:NH3 < PH3 < AsH3 < SbH3 < BiH3

Which of the mentioned oxides of nitrogen is a colored gas?

  1. NO2
  2. NO
  3. N2O
  4. N2O5

Question’s Answer:NO2

The basic strength of hydrides of group 15 elements vary in the following order

  1. BiH3 > NH3 > PH3 > AsH3 > SbH3c
  2. PH3 > NH3 > AsH3 > SbH3 > BiH3
  3. NH3 > PH3 > AsH3 > SbH3 > BiH3
  4. NH3 > PH3 > SbH3 > AsH3 > BiH3

Question’s Answer:NH3 > PH3 > AsH3 > SbH3 > BiH3

Which of following trihalides of nitrogen behaves as the weakest base?

  1. NI3
  2. NCI3
  3. NBr3
  4. NF3

Question’s Answer:NF3

Which trihalide is not hydrolyzed by water?

  1. NF3
  2. NCI3
  3. PCl3
  4. AsCl3

Question’s Answer:NF3

Which catalyst is helpful and used in Contact process?

  1. SO3
  2. FeO
  3. N2O3
  4. V₂O5

Question’s Answer:V₂O5

Select the false statement.

  1. In PCl5, P atom is sp³d-hybridized and has trigonal bipyramidal geometry.
  2. PCl5 on hydrolysis forms phosphoric acid
  3. PCl5 acts as Lewis acid
  4. 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.

  1. N2O5 > P2O5 > As2O5 > Sb2O5 > Bi2O5
  2. Bi2O5 > Sb2O5 > As2O5 > P2O5 > N2O5
  3. P2O5 > N2O5 > As2O5 > Sb2O5 > Bi2O5
  4. 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?

  1. N2O2
  2. NO2
  3. N2O4
  4. NO

Question’s Answer:N2O

Which of the mentioned acids possesses oxidizing, reducing and complex forming properties?

  1. H₂SO4
  2. HCI
  3. HNO3
  4. HNO₂

Question’s Answer: HNO₂

Which of the mentioned elements of group 15 is a typical metal?

  1. P
  2. Bi
  3. Sb
  4. 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?

  1. Bi
  2. P
  3. As
  4. N

Question’s Answer: N

Which of the mentioned acids have P atom ‘exits in lower oxidation state?

  1. H3PO4
  2. H3PO2
  3. HзPO3
  4. H4P207

Question’s Answer:H3PO2

Which of the mentioned does not form stable diatomic molecule?

  1. Nitrogen
  2. Hydrogen
  3. Phosphorus
  4. Oxygen

Question’s Answer: Phosphorus

The oxidation states shown by phosphorus is/are

  1. -3
  2. +3
  3. +3 and +5
  4. -3, +3 and +5

Question’s Answer:-3, +3 and +5

White phosphorus is usually kept under

  1. Ammonia liquor
  2. Cold water
  3. Ethanol
  4. Kerosene

Question’s Answer: Cold water

Which of the mentioned statement is true?

  1. PH3 is more basic than ammonia
  2. NH3 is amphoteric and PH3 is basic
  3. PH3 is equally basic as ammonia
  4. PH3 is less basic than ammonia

Question’s Answer:PH3 is less basic than ammonia

Nitric acid can be prepared by

  1. from sodium nitrate and sulfuric acid
  2. Birkland tyde process
  3. Ostwald’s process
  4. All of A, B, and C

Question’s Answer: All of A, B, and C

Ostwald’s process for the manufacture HNO, involves the

  1. oxidation of N₂ to NO
  2. oxidation of NH3 to NO in presence PU/Rh catalyst
  3. combination of N2 and O2
  4. combination of H2O and N₂O5

Question’s Answer: oxidation of NH3 to NO in presence PU/Rh catalyst

The strongest acid is

  1. HNO3
  2. HNO2
  3. H₂N2O2
  4. Any of these

Question’s Answer:HNO3

Phosphorus has the oxidation state of +3 in

  1. Orthophosphoric acid
  2. Hypophosphoric acid
  3. Orthophosphorus acid
  4. 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

  1. Nitrogen and hydrogen react to form NH3
  2. Ammonia is burned in O2 to generate N2 and H2O
  3. Nitrogen and oxygen react to form NO2
  4. 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?

  1. H3PO4
  2. H3PO3
  3. H3P207
  4. H3PO2

Question’s Answer: H3PO2

Which of the mentioned acids have P atom exits in highest oxidation state?

  1. H4P2O7
  2. H3PO3
  3. H3PO₂
  4. H4P2O6

Question’s Answer: H4P2O7

Hydrolysis of P4O10 with excess of water gives _____.

  1. H4P2O6
  2. H3PO4
  3. HзPO2
  4. H4P207

Question’s Answer: H3PO4

 

Which of the mentioned elements shows catenation?

  1. As
  2. Bi
  3. Sb
  4. N

Question’s Answer:N

Aqua regia is made by dissolving a mixture of HNO3 and HCl with ____  ratio.

  1. 1:3
  2. 2:1
  3. 1:2
  4. 1:1

Question’s Answer:1:3

Nitric acid has the property of __ .

  1. Reducing
  2. Nitrating
  3. Redoxing
  4. Any of these

Question’s Answer: Nitrating

Nitric acid is helpful and used in manufacturing of _____ .

  1. Fertilizer
  2. H2SO4
  3. Explosive
  4. All of A, B, and C

Question’s Answer: All of A, B, and C

More Inorganic Chemistry MCQs

  1. Chemical Bonding MCQs
  2. Acids and Bases in inorganic chemistry MCQs
  3. Boron And Aluminum MCQs
  4. Carbon and Silicon MCQs
  5. Hydrogen, Alkali, and Alkaline Earth Metals MCQs
  6. D-Block Elements MCQs [Chemistry]
  7. F-Block Elements MCQs
  8. Halogens MCQs
  9. Inert Gases MCQs
  10. Nitrogen and Phosphorus MCQs
  11. Oxygen and Sulphur MCQs
  12. Experimental Inorganic Chemistry MCQs
  13. Periodic Classification Of Elements And Periodicity Of Properties MCQs
  14. CHEMISTRY MCQs From all subjects of  Chemistry

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