Quiz  /  Hydrogen Class 11 MCQ Questions With Answers

  • 1. 
    Atomic no.of Hydrogen is

  • 1
  • 2
  • 3
  • 4

  • 2. 
    Which of the following process will produce hardwater ?

  • Saturation of water with CaCO3
  • Saturation of water with MgCO3
  • Saturation of water with CaSO4
  • Addition of Na2CO water

  • 3. 
    đŸ‘ˆ Consider the reactionWhich of the following statements is correct about H2O2 with reference to these reactions? Hydrogen peroxide is ________.

  • an oxidising agent in both (A) and (B)
  • an oxidising agent in (A) and reducing agent in (B)
  • a reducing agent in (A) and oxidising agent in (B)
  • a reducing agent in both (A) and (B) a reducing agent in both (A) and (B)

  • 4. 
    Consider the reactions(A) H2O2 + 2HI ----------> I2 + 2H2O(B) HOCl + H2O2 ----------> 2H3O+ + Cl- + O2Which of the following statements is correct about H O with reference to these reactions?Hydrogen peroxide is ________.

  • an oxidising agent in both (A) and (B)
  • an oxidising agent in (A) and reducing agent in (B)
  • a reducing agent in (A) and oxidising agent in (B)
  • a reducing agent in both (A) and (B)

  • 5. 
    Decomposition of H2O2 can be prevented by addition of

  • Ferrous sulphate
  • oxalic acid
  • Ozone
  • Glycerol

  • 6. 
    In context with the industrial preparation of hydrogen from water gas (CO+H2),which of the followingis the correct statement ?

  • CO is removed by absorption in aqueous Cu2Cl2 solution
  • H2 is removed through occlusion with Pd
  • CO is oxidized to CO2 with steam in the presence of a catalyst followed by absorption of CO2 in alkali
  • CO and H2 are fractionally separated using differences in their densities

  • 7. 
    Which reaction shows preparation of Hyderogen from active metals and water:

  • Na + H2O = NaOH
  • Li + OH =LiOH
  • H + O = HO
  • K + H2O = KOH + H2

  • 8. 
    In the laboratoryH2O2 is prepared by the action of

  • cold dilute H2SO4 on hydrated BaO2
  • dil.HCl on MnO2
  • cold H2SO4 on MnO2
  • aqueous alkali on Na2O2

  • 9. 
    Statement–1 : ZrH2 is a non-stoichiometric hydride.Statement–2 :The composition of ZrH2 is exact same as its chemical formula.

  • Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1.
  • Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1.
  • Statement-1 is true, statement-2 is false.
  • Statement-1 is false, statement-2 is true

  • 10. 
    Assertion (A) : Permanent hardness of water is removed by treatment with washing soda.Reason (R) : Washing soda reacts with soluble magnesium and calcium sulphate to forminsoluble carbonates.

  • Statements A and R both are correct and R is the correct explanation of A.
  • A is correct but R is not correct.
  • A and R both are correct but R is not the correct explanation of A.
  • A and R both are false.

  • 11. 
    In the preparation of Hydrogenated Oil in industries is known as

  • Oxidation
  • Reduction
  • Hydrogenation
  • Hydration

  • 12. 
    Hydrogen resembles halogens in many respects for which several factors are responsible. Of the following factors which one is most important in this respect?

  • Its tendency to lose an electron to form a cation.
  • Its tendency to gain a single electron in its valence shell to attain stable electronic configuration.
  • Its low negative electron gain enthalpy value.
  • Its small size.

  • 13. 
    Which of the following ions will cause hardness in water sample?

  • (i) Ca2+
  • (ii) Na+
  • (iii) Cl-
  • K+

  • 14. 
    When hydrogen peroxide is shaken with an acidified solution of potassium dichromate in presence of ether, the ethereal layer turns blue due to the formation of

  • Cr2O3
  • CrO(O2)2
  • CrO4 2–

  • 15. 
    ___________ is the radioactive isotope of Hydrogen

  • Deuterium
  • Tritium

  • 16. 
    Metal hydrides are ionic, covalent or molecular in nature. Among LiH, NaH, KH, RbH, CsH, the correct order of increasing ionic character is

  • LiH > NaH > CsH > KH>RbH
  • LiH < NaH < KH < RbH < CsH
  • RbH > CsH > NaH > KH > LiH
  • NaH > CsH > RbH > LiH > KH

  • 17. 
    Radioactive elements emit α, β and γ rays and are characterised by their half lives. Theradioactive isotope of hydrogen is

  • Protium
  • Deuterium
  • Tritium
  • Hydronium

  • 18. 
    What is False about ice-

  • Its density is more than water
  • A water molecule form 4 H-Bond
  • It is a thermal insulator
  • Its density is less than water

  • 19. 
    Which of the following hydrides is electron-precise hydride?

  • B2H6
  • NH3
  • H2O
  • CH4

  • 20. 
    Only one element of ________ forms hydride.

  • group 6
  • group 7
  • group 8
  • group 9

  • 21. 
    Metal which does not react with cold water but evolved H2 when react with Steam

  • Na
  • K
  • Fe
  • Pt

  • 22. 
    Hardness of water may be temporary or permanent. Permanent hardness is due to the presence of

  • Chlorides of Ca and Mg in water
  • Sulphites of Ca and Mg in water
  • Hydrogen carbonates of Ca and Mg in water
  • Carbonates of alkali metals in water
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