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Hydrogen Test - 6

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Hydrogen Test - 6
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  • Question 1
    1 / -0
    Hydrogen exists in
    Solution
    Hydrogen exists in + 1, - 1 & zero oxidation state.
  • Question 2
    1 / -0
    Which of the following resemble hydrogen in its properties?
    Solution
    Both hydrogen and alkali metals have one electron in their valence shell. Both hydrogen and halogens need one electron to complete their outermost shell. So, they behave similarly.
  • Question 3
    1 / -0
    Directions: The following question has four choices, out of which ONLY ONE is correct.

    Hydrogen behaves as an oxidising agent when it reacts with
    Solution
    Hydrogen behaves as an oxidising agent when it reacts with calcium to give calcium hydride.
    Ca + H2 CaH2
  • Question 4
    1 / -0
    Directions: 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
    Hydrogen is
    Solution
    Hydrogen can gain electrons (like halogens) as well as lose electrons (like alkali metals).
    So, it is electropositive as well as electronegative.
  • Question 6
    1 / -0
    The ionisation energy of hydrogen is
    Solution
    Ionisation energy of hydrogen is very high. It is comparable to that of halogens.
  • Question 7
    1 / -0
    Heavy water is a form of water where the hydrogen atoms are the isotope variant deuterium. It is also called deuterium oxide.
    Which of the following statements regarding deuterium oxide is not correct?
    Solution
    Statement (4) is incorrect because heavy water is not safe to drink. Drinking just a few millilitres or anything up to a regular glass of water might not actually have any noticeable effects. However, any amount larger than that would cause dizziness probably because heavy water has a greater density than regular water and can affect the fluid in the inner ear which is essential for keeping the balance.
  • Question 8
    1 / -0
    Heavy water is
    Solution
    Heavy water (deuterium oxide, D2O) is a form of water that contains only deuterium (D, also known as heavy hydrogen) rather than the common hydrogen-1 isotope (H, also called protium) that makes up most of the hydrogen in normal water.
  • Question 9
    1 / -0
    Nascent hydrogen is chemically more reactive than molecular hydrogen because it
    Solution
    Nascent hydrogen has one unpaired electron in its valence shell. So, it is very reactive and undergoes several reactions to make a variety of compounds.
  • Question 10
    1 / -0
    The absorption of hydrogen by platinum is known as
    Solution
    The absorption of hydrogen by platinum is known as occlusion and the absorbed hydrogen is known as occluded hydrogen.
  • Question 11
    1 / -0
    The conversion of ordinary hydrogen into atomic hydrogen is
    Solution
    The conversion of ordinary hydrogen into atomic hydrogen is a highly endothermic reaction. Energy is required to break the bond.
    H2 2H
  • Question 12
    1 / -0
    Directions: The following question has four choices out of which ONLY ONE is correct.

    The molecule of ortho hydrogen is distinguished from that of para hydrogen by
    Solution
    Ortho hydrogen molecules are those in which the spins of both the nuclei are in the same direction. Molecules of hydrogen in which the spins of both the nuclei are in the opposite direction are called para hydrogen.



  • Question 13
    1 / -0
    Heavy water is made by
    Solution
    Heavy water is made by 1. fractional distillation of water 2. exhaustive electrolysis of alkalified water 3. chemical exchange involving 11H & 12 H
  • Question 14
    1 / -0
    Heavy water is used in atomic reactors as a
    Solution
    Heavy water is used in atomic reactors as a moderator.
  • Question 15
    1 / -0
    Heavy water is classified as heavy because it
    Solution
    Heavy water is classified as heavy because it is an oxide of deuterium.
  • Question 16
    1 / -0
    In nuclear reactors, the speed of neutrons is suppressed by
    Solution
    Most reactor designs in existence are thermal reactors and typically use water as a neutron moderator (moderator means that it slows down the neutron to a thermal speed) and as a coolant.
  • Question 17
    1 / -0
    The H-O-O bond angle in hydrogen peroxide in gas phase is
    Solution
    The structure of H2O2 molecule in the gas phase is:


    Hence, option (1) is correct since the value of the bond angle provided is closest to the actual value.


  • Question 18
    1 / -0
    In hydrogen peroxide molecule,
    Solution
    In hydrogen peroxide molecule the four atoms are arranged in a non-linear & non-planar manner.
  • Question 19
    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 20
    1 / -0
    Alkaline hydrogen peroxide reacts with ethylene to give
    Solution
    Alkaline hydrogen peroxide reacts with ethylene to give ethanol.
  • Question 21
    1 / -0
    How does H2O2 react when it is added to a solution of KMnO4 and a solution of KI, respectively?
    Solution
    H2O2 acts as a reducing agent and an oxidising agent when it is added to a solution of KMnO4 and a solution of KI, respectively.
    As a reducing agent:
    2KMnO4 + 5H2O2 + 3H2SO4 K2SO4 + 5O2 + 2MnSO4 + 8H2O
    As an oxidising agent:
    3KI + H2O2 + H2SO4 KI3 + K2SO4 + 2H2O
  • Question 22
    1 / -0
    H2O2 is not used
    Solution
    H2O2 is not used in the manufacture of heavy mater.
  • Question 23
    1 / -0
    In acidic medium, H2O2 acts as a reducing agent on reaction with
    Solution
    In acidic medium, H2O2 acts as a reducing agent on reaction with acidified KMnO4
  • Question 24
    1 / -0
    Which of the following does not give H2O2 on hydrolysis?
    Solution
    Perchloric Acid is not susceptible to hydrolysis.
  • Question 25
    1 / -0
    Which of the following metal oxides does not produce H2O2 on treatment with acid?
    Solution
    PbO2 does not produce H2O2 on treatment with acid. PbO2 (s) + 4HCl (aq) → PbCl2 (s) + Cl2 (g) + 2 H2O(l)
    Barium peroxide, Potassium peroxide, Zinc peroxide all produce H2O2 as a product on reaction with acids.

    ZnO2 + 2HCl → ZnCl2 + H2O2
    BaO2 + 2HCl → BaCl2 + H2O2
    K2O2 + 2HCl → 2KCl + H2O2
  • Question 26
    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 27
    1 / -0
    The percentage by weight, of hydrogen in hydrogen peroxide is
    Solution
    Molar mass of H2O2 = 34 g/mol
    Mass of Hydrogen in H2O2 = 2 g/mol
    Percentage by weight, of hydrogen in hydrogen peroxide = (2g/34g mol-1) × 100 = 5.88%.
  • Question 28
    1 / -0
    The substance which reduces the speed of decomposition of hydrogen peroxide is
    Solution
    Hydrogen peroxide turns a black substance white. The black substance is PbS
  • Question 29
    1 / -0
    Hydrogen peroxide turns a black substance white. The black substance is
    Solution
    The black substance is PbS. Black lead sulphide is oxidised to white lead sulphate:

    PbS + 4H2O2 PbSO4 + 4H2O
  • Question 30
    1 / -0
    Bleaching action of H2O2 is due to its
    Solution
    With its oxidizing properties, hydrogen peroxide is often used as a bleach or cleaning agent.
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