Q1. In terms of ionization enthalpy ,hydrogen resembles more with
- Carbonyl compound
- Halogens
- Isopropyl free radical
- Ethyl free radical
Answer :- (2)
Q2. Decomposition of H2O2 yields:
- H2 and O2
- H2O and O2
- H+ and OH–
- 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:
- 50 mL
- 25 mL
- 100 mL
- 125 mL
Answer :- (2)
Q4. D2O is known as:
- Heavy hydrogen
- Heavy oxygen
- Heavy water
- Hard water
Answer :- (3)
Q5. Since the isotopes have the same electronic configuration, they have the same
- Free radical chain mechanism
- Termination
- Chemical properties
- Physical properties
Answer :- (1)
Q6. Of all the isotopes of hydrogen, which one is highly radioactive?
- HD
- Tritium
- Deuterium
- Protium
Answer :- ()
Q7. Water has maximum density at:
- 4oC
- 4K
- 0oC
- 1oC
Answer :- (1)
Q8. H2O2 can be used as:
- Bleaching agent
- Oxidizing agent
- Antiseptic
- All the above
Answer :- (3)
Q9. Largest single use of dihydrogen is in the:
- Manufacture of HCl
- Manufacture of ammonia
- Manufacture of nylon
- Manufacture of refined oil
Answer :- (2)
Q10. Interstitial hydrides are formed by:
- p and f block elements
- s and d block elements
- d and f block elements
- 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:
- Helium
- Dihydrogen, H2
- Sodium
- Aluminium
Answer :- (2)
Q12. Oxidation state of hydrogen in H2O and H2O2 respectively is:
- +1 and +0.5
- +1 in both
- -1 in both
- +1 and -1
Answer :- (2)
Q13. Water is:
- Acidic
- Basic
- Alkaline
- Amphoteric
Answer :- (4)
Q14. Three isotopes of hydrogen are:
- Helium-2,Helium-3 and Helium-4
- Deuterium,tritium and protium
- 140Ho ,141Ho and 142Ho
- Graphite, fullerene and diamond
Answer :- (2)
Q15. Hydrides are classified as:
- Non-ionic,non-covalent and non-metallic
- Ionic,covalent and metallic
- Non-covalent,non-molecular and stoichiometric
- Non-molecular,non-metallic and stoichiometric
Answer :- (2)
Q16. Which of the following contains interstitial water?
- FeSO4
- BaCl2
- CuSO4
- CrCl2
Answer :- ()
Q17. Which of the following can remove permanent hardness of water?
- Na2CO3
- Na6P6O18
- Ion exchange resin
- All of the above
Answer :- ()
Q18. Like alkali metals hydrogen also forms:
- Oxides,halides and sulphides
- Metallic bonding
- Homolytic cleavage
- Optical isomers
Answer :- ()
Q19. Number of neutrons in Tritium are:
- 4
- 3
- 2
- 1
Answer :- ()
Q20. Electron-rich hydrides have excess electrons that are present as:
- Free radical
- Lone pairs
- Chain pair
- Dot structure
Answer :- ()
Q21. The physical properties of isotopes differ due to:
- Large mass differences
- Fast rate of reaction
- Similar chemical properties
- Large physical differences
Answer :- ()
Q22. H2O2 can act as:
- Oxidizing agent
- Reducing agent
- Both oxidizing and reducing agent
- Neither oxidizing nor reducing agent
Answer :- ()
Q23. NaH when added to water produces a large amount of energy. The hydride will be:
- Interstitial hydride
- Covalent hydride
- Ionic hydride
- All of the above
Answer :- ()
Q24. With dinitrogen,dihydrogen forms:
- Ethanal
- Ammonia
- Silicon
- Diamond
Answer :- ()
Q25. Ice floats on water because:
- Density of ice is equal to that of water
- Density of ice is less than that of water
- Density of ice is more than that of water
- Ice is heavier than water
Answer :- ()
Q26. Which of the following is an incorrect statement?
- Temporary hardness of water can be removed by boiling.
- Temporary hardness of water is due to bicarbonates of Ca and Mg.
- Temporary hardness of water is due to chlorides and sulphates of Ca and Mg.
- Permanent hardness of water is due to chlorides and sulphates of Ca and Mg.
Answer :- ()
Q27. Which of the following statements is correct?
- Permanent hardness of water can be removed by boiling.
- Temporary and permanent hardness of water can be removed by boiling.
- Neither temporary nor permanent hardness of water can be removed by boiling.
- Temporary hardness of water can be removed by boiling.
Answer :- ()
Q28. 10 volume of H2O2 means:
- 10L of this solution will give 1L of O2 at S.T.P
- 1L of this solution will give 10L of H2 at S.T.P
- 10L of this solution will give 1L of H2 at S.T.P
- 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:
- Alkali metals
- Carbon
- Alkaline earth metals
- Halogens
Answer :- ()
Q30. Tritium is an isotope of the element:
- Hydrogen
- Helium
- Chlorine
- Sodium
Answer :- ()
Q31. Electron rich hydrides are formed by compounds of group:
- 15-17
- 14
- 7-8
- 13
Answer :- ()
Q32. Hydrogen differs from alkali metals as it:
- Has one electron in its valency shell
- Does not possess metallic character
- Can form compounds with non-metals
- Halides of hydrogen ionizes in aqueous solution
Answer :- ()
Q33. The sum of number of neutrons and protons in tritium is:
- 3
- 4
- 5
- 6
Answer :- ()
Q34. Dihydrogen under certain reaction conditions combines with all elements except:
- Noble gases
- Non-metals
- Metals
- Halogens
Answer :- ()
Q35. Reaction of granulated zinc with dil HCl results in formation of:
- HD
- Tritium
- Dihydrogen
- Protium
Answer :- ()
Q36. On an industrial scale, H2O2 is prepared by oxidation of:
- 2-ethylanthraquinone
- 2-ethylanthraquinine
- 2-ethylanthraquinol
- 2-methylanthraquinol
Answer :- ()
Q37. Clark’s method of water softening uses:
- Na2CO3
- Ca(OH)2
- Ion exchange resin
- Na6P6O18
Answer :- ()
Q38. From the following statements regarding H2O2, choose the incorrect statement:
- It can act only as an oxidizing agent.
- It decomposes on exposure to light.
- It has to be stored in plastic or wax lined glass bottles in dark.
- It is miscible in water in all proportions and forms a hydrate.
Answer :- ()
Q39. Terrestrial hydrogen contains deuterium mostly in the form of:
- NR
- MD
- HD
- SD
Answer :- ()