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Hydrogen Test - 5

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Hydrogen Test - 5
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Weekly Quiz Competition
  • Question 1
    1 / -0
    H2O2 acts as an oxidising agent in
    Solution
    H2O2 acts as an oxidizing agent under acidic and alkaline medium.
    In acidic medium:
    2KI + H2SO4 + H2O2 K2SO4 + 2H2O + I2
    In alkaline medium
    2Cr(OH)3 (green) + 4NaOH + 3H2O2 2Na2CrO4 (yellow) + 8H2O
  • Question 2
    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 3
    1 / -0
    Directions: The following question has four choices out of which ONLY ONE is correct.

    The oxide that gives hydrogen peroxide on treatment with dilute acid is
    Solution
    Following reaction takes place in this case:

    Na2O2 + 2HCl H2O2 + 2NaCl
  • Question 4
    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 5
    1 / -0
    Which acid is normally used for the laboratory preparation of dihydrogen?
    Solution
    It is usually prepared by the reaction of granulated zinc with dilute sulphuric acid.
    Zn + H2SO4 ZnSO4 + H2
  • Question 6
    1 / -0
    Which of the following substances are used as starting materials in Bosch reaction?
    Solution
    Bosch reaction is a chemical reaction between carbon dioxide and hydrogen that produces elemental carbon (graphite), water and a 10% return of invested heat.
    The following reaction takes place:
    CO2(g) + 2H2(g) C(s) + 2H2O(g)
  • Question 7
    1 / -0
    Which of the following substances is formed when dihydrogen reacts with CO at 700 K in the presence of ZnO/Cr2O3 (catalyst)?
    Solution
    The following reaction takes place.

  • Question 8
    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 9
    1 / -0
    Select the correct decreasing order of boiling points of the following hydrides:

    (A) NH3
    (B) PH3
    (C) AsH3
    (D) SbH3
    (E) H2O
    Solution
    The decreasing order of boiling points of NH3, PH3, AsH3, SbH3 and H2O is as:
    H2O > NH3 > SbH3 > AsH3 > PH3
    The b.p. generally increases as the molecular mass increases, but in NH3 and H2O the boiling point increases also due to presence of hydrogen bonding hence they have higher boiling points.
  • Question 10
    1 / -0
    Which of the following cannot be used for water softening?
    Solution
    Magnesium chloride cannot be used for water softening as it results in water hardening.
    Calcium and magnesium dissolved in water are the two most common minerals that make water "hard." The degree of hardness becomes greater as the calcium and magnesium content increases and is related to the concentration of multivalent cations dissolved in the water.
  • Question 11
    1 / -0
    Polyphosphates are used as water softening agents in sequestration because they
    Solution
    Polyphosphates are used as water softening agents in sequestration because they form soluble complexes with cationic species.
    CaCl2 + (NaPO3)n Nan - 2Ca(PO3)n + 2NaCl
  • Question 12
    1 / -0
    When Mg3N2 is subjected to deuterolysis, the product obtained is
    Solution
    Mg3N2 + 6D2O → 3Mg(OD)2 + 2ND3
  • Question 13
    1 / -0
    The ionisation energy of hydrogen is
    Solution
    Ionisation energy of hydrogen is very high. It is comparable to that of halogens.
  • Question 14
    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 15
    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.
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