Hydrogen – Multiple Choice Questions

Q1. In terms of ionization enthalpy ,hydrogen resembles more with

  1. Carbonyl compound
  2. Halogens
  3. Isopropyl free radical
  4. Ethyl free radical

Answer :- (2)

Q2. Decomposition of H2Oyields:

  1. H2 and O2
  2. H2O and O2
  3. H+ and OH
  4. H and O

Answer :- (2)

Q3. The volume of a “10 volume solution”  of  H2O2  required to liberate 500mL O2 at N.T.P, is:

  1. 50 mL
  2. 25 mL
  3. 100 mL
  4. 125 mL

Answer :- (2)

Q4. D2O is known as:

  1. Heavy hydrogen
  2. Heavy oxygen
  3. Heavy water
  4. Hard water

Answer :- (3)

Q5. Since the isotopes have the same electronic configuration, they have the same

  1. Free radical chain mechanism
  2. Termination
  3. Chemical properties
  4. Physical properties

Answer :- (1)

Q6. Of all the isotopes of hydrogen, which one is highly radioactive?

  1. HD
  2. Tritium
  3. Deuterium
  4. Protium

Answer :- ()

Q7. Water has maximum density at:

  1. 4oC
  2. 4K
  3. 0oC
  4. 1oC

Answer :- (1)

Q8. H2Ocan be used as:

  1. Bleaching agent
  2. Oxidizing agent
  3. Antiseptic
  4. All the above

Answer :- (3)

Q9. Largest single use of dihydrogen is in the:

  1. Manufacture of HCl
  2. Manufacture of ammonia
  3. Manufacture of nylon
  4. Manufacture of refined oil

Answer :- (2)

Q10. Interstitial hydrides are formed by:

  1. p and f block elements
  2. s and d block elements
  3. d and f block elements
  4. s and p block elements

Answer :- (3)

Q11. Element that is found abundantly in the universe and is the principal element of solar atmosphere is:

  1. Helium
  2. Dihydrogen, H2
  3. Sodium
  4. Aluminium

Answer :- (2)

Q12. Oxidation state of hydrogen in H2O and H2O2 respectively is:

  1. +1 and +0.5
  2. +1 in both
  3. -1 in both
  4. +1 and -1

Answer :- (2)

Q13. Water is:

  1. Acidic
  2. Basic
  3. Alkaline
  4. Amphoteric

Answer :- (4)

Q14. Three isotopes of hydrogen are:

  1. Helium-2,Helium-3 and Helium-4
  2. Deuterium,tritium and protium
  3. 140Ho ,141Ho  and 142Ho
  4. Graphite, fullerene and diamond

Answer :- (2)

Q15. Hydrides are classified as:

  1. Non-ionic,non-covalent and non-metallic
  2. Ionic,covalent and metallic
  3. Non-covalent,non-molecular and stoichiometric
  4. Non-molecular,non-metallic and stoichiometric

Answer :- (2)

Q16. Which of the following contains interstitial water?

  1. FeSO4
  2. BaCl2
  3. CuSO4
  4. CrCl2

Answer :- ()

Q17. Which of the following can remove permanent hardness of water?

  1. Na2CO3
  2. Na6P6O18
  3. Ion exchange resin
  4. All of the above

Answer :- ()

Q18. Like alkali metals hydrogen also forms:

  1. Oxides,halides and sulphides
  2. Metallic bonding
  3. Homolytic cleavage
  4. Optical isomers

Answer :- ()

Q19. Number of neutrons in Tritium are:

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

Answer :- ()

Q20. Electron-rich hydrides have excess electrons that are present as:

  1. Free radical
  2. Lone pairs
  3. Chain pair
  4. Dot structure

Answer :- ()

Q21. The physical properties of isotopes differ due to:

  1. Large mass differences
  2. Fast rate of reaction
  3. Similar chemical properties
  4. Large physical differences

Answer :- ()

Q22. H2Ocan act as:

  1. Oxidizing agent
  2. Reducing agent
  3. Both oxidizing and reducing agent
  4. Neither oxidizing nor reducing agent

Answer :- ()

Q23. NaH  when added to water produces a large amount of energy. The hydride will be:

  1. Interstitial hydride
  2. Covalent hydride
  3. Ionic hydride
  4. All of the above

Answer :- ()

Q24. With dinitrogen,dihydrogen forms:

  1. Ethanal
  2. Ammonia
  3. Silicon
  4. Diamond

Answer :- ()

Q25. Ice floats on water because:

  1. Density of ice is equal to that of water
  2. Density of ice is less than that of water
  3. Density of ice is more than that of water
  4. Ice is heavier than water

Answer :- ()

Q26. Which of the following is an incorrect statement?

  1. Temporary hardness of water can be removed by boiling.
  2. Temporary hardness of water is due to bicarbonates of Ca and Mg.
  3. Temporary hardness of water is due to chlorides and sulphates of Ca and Mg.
  4. Permanent hardness of water is due to chlorides and sulphates of Ca and Mg.

Answer :- ()

Q27. Which of the following statements is correct?

  1. Permanent hardness of water can be removed by boiling.
  2. Temporary and permanent hardness of water can be removed by boiling.
  3. Neither temporary nor permanent hardness of water can be removed by boiling.
  4. Temporary hardness of water can be removed by boiling.

Answer :- ()

Q28. 10 volume of  H2O2 means:

  1. 10L of this solution will give 1L of O2 at S.T.P
  2. 1L of this solution will give 10L of H2 at S.T.P
  3. 10L of this solution will give 1L of H2 at S.T.P
  4. 1L of this solution will give 10L of O2 at S.T.P

Answer :- ()

Q29. Hydrogen has tendency to gain one electron to acquire helium configuration, in this respect it resembles:

  1. Alkali metals
  2. Carbon
  3. Alkaline earth metals
  4. Halogens

Answer :- ()

Q30. Tritium is an isotope of the element:

  1. Hydrogen
  2. Helium
  3. Chlorine
  4. Sodium

Answer :- ()

Q31. Electron rich hydrides are formed by compounds of group:

  1. 15-17
  2. 14
  3. 7-8
  4. 13

Answer :- ()

Q32. Hydrogen differs from alkali metals as it:

  1. Has one electron in its valency shell
  2. Does not possess metallic character
  3. Can form compounds with non-metals
  4. Halides of hydrogen ionizes  in aqueous solution

Answer :- ()

Q33. The sum of number of neutrons and protons in tritium is:

  1. 3
  2. 4
  3. 5
  4. 6

Answer :- ()

Q34. Dihydrogen under certain reaction conditions combines with all elements except:

  1. Noble gases
  2. Non-metals
  3. Metals
  4. Halogens

Answer :- ()

Q35. Reaction of granulated zinc with dil HCl results in formation of:

  1. HD
  2. Tritium
  3. Dihydrogen
  4. Protium

Answer :- ()

Q36. On an industrial scale, H2Ois prepared by oxidation of:

  1. 2-ethylanthraquinone
  2. 2-ethylanthraquinine
  3. 2-ethylanthraquinol
  4. 2-methylanthraquinol

Answer :- ()

Q37. Clark’s method of water softening uses:

  1. Na2CO3
  2. Ca(OH)2
  3. Ion exchange resin
  4. Na6P6O18

Answer :- ()

Q38. From the following statements regarding H2O2, choose the incorrect statement:

  1. It can act only as an oxidizing agent.
  2. It decomposes on exposure to light.
  3. It has to be stored in plastic or wax lined glass bottles in dark.
  4. It is miscible in water in all proportions and forms a hydrate.

Answer :- ()

Q39. Terrestrial hydrogen contains deuterium mostly in the form of:

  1. NR
  2. MD
  3. HD
  4. SD

Answer :- ()

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