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Hydrogen Test - 1

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Hydrogen Test - 1
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Which of these hydrogen halides forms salts like KHX2 (where X is a halogen atom)?

    Solution

    Fluorine ion by a process of hydrogen bonding forms the anion [HF2]-. Hence, in the presence of an alkali like KOH, HF forms salt-like compounds like KHF2.

     

  • Question 2
    1 / -0

    Match the following:

    List - I (Hydride) List - II (Type of Hydride)
    A. BeH2 1. Complex
    B. AsH3 2. Lewis acid
    C. B2H6 3. Interstitial
    D. LaH3 4. Covalent
    E. LiAlH4 5. Intermediate
      6. Ionic
    Solution

    Complex- Addition compounds which do not give all their constituent ions when dissolved in water, individual identity of ions are lost,
    eg,- [Cu(NH3)4]SO4, LiAIH4.

    Lewis acid- Electron deficient species which gain electrons while forming a bond with Lewis bases. eg,-B2H6.
    Interstitial metal hydrides- f-block hydrides are non-stoichiometric eg, LaHn, etc, where chemical composition is variable eg,- LaH2.87, XbH2.5 etc.
    Intermediate hydride- Polymeric in nature eg, BeH2
    Covalent hydride- Bond forms by sharing of electron. eg, AsH3.

     

  • Question 3
    1 / -0

    For the laboratory preparation of H2O2,

    Solution

    For the laboratory preparation of H2O2, BaO2 is added to ice cold solution of sulphuric acid.
    BaO2 + H2SO4 →  BaSO4 + H2O2

     

  • Question 4
    1 / -0

    The following question has four choices out of which ONLY ONE is correct.

    Electrolysis of a hydrochloric acid solution produces

    Solution

    Electrolysis of a hydrochloric acid solution produces oxygen at anode and hydrogen at cathode.
    The products of electrolysis of dilute solutions of all acids are same as the products of electrolysis of water.

     

  • Question 5
    1 / -0

    Which of the following processes is not used for concentration of hydrogen peroxide?

    Solution

    Sublimation is not used for concentration of hydrogen peroxide. H2O2 does not sublime, it decomposes at a temperature below its boiling point.

     

  • Question 6
    1 / -0

    O2F2 molecule resembles H2O2 in

    Solution

    O2F2 molecule resembles H2O2 in structure.

     

  • Question 7
    1 / -0

    The following question has four choices out of which ONLY ONE is correct.

    Which of the following is not a method of commercial production of dihydrogen?

    Solution

    Reaction of impure Zn with dil. HCl is not used for commercial production of dihydrogen due to low yield.

     

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