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Hydrogen Test - 35

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Hydrogen Test - 35
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  • Question 1
    1 / -0
    Which type of bonding is responsible for the relatively high boiling point of water?
    Solution
    Hydrogen bonding is the reason for water's abnormally high boiling point.
    Due to intermolecular hydrogen bonds, water molecules associate and require more energy to get separated for vaporization.

  • Question 2
    1 / -0
    Which of these describe the molecular structure of water?
    Solution
    The option (D) describe the molecular structure of water.
    The O atom has two bond pairs of electrons and two lone pairs of electrons.
    The oxygen atom is $$\displaystyle  sp^3$$ hybridized which results in tetrahedral electron pair geometry and bent  (or V shaped) molecular geometry.
  • Question 3
    1 / -0
    Which of the following properties can be assigned to water?
    I. It has a permanent dipole moment attributed to its molecular structure.
    II. It is a very good conductor of electricity.
    III. It has its polar covalent bonds with hydrogen on opposite sides of the oxygen atom, so that the molecule is linear.
    Solution
    The property I only can be assigned to water.
    I. It has a permanent dipole moment attributed to its molecular structure.
    Water is polar in nature due to electronegativity difference between H atom and O atom.
    The individual bond dipoles do not cancel each other as water has bent shape.
    II. It is a non-conductor of electricity as it lacks ions.
    III. It has its polar covalent bonds between hydrogen and oxygen which forms V shape for the molecule so that the molecule is non linear or bent.
  • Question 4
    1 / -0
    Statement 1: The water molecule is polar.
    Statement 2: The radius of an oxygen atom is greater than that of a hydrogen atom.
    Solution
    Statement 1: The water molecule is polar due to electronegativity difference between O and H atoms and non linear structure of water molecule..
    Statement 2: The radius of an oxygen atom is greater than that of a hydrogen atom because the number of electrons and nucleons in O atom is much more than the number of electrons and protons in H atom.
    Hence, both Statement 1 and Statement 2 are correct and Statement 2 is not  the correct explanation of Statement 1.
  • Question 5
    1 / -0
    What is chiefly responsible for the relatively high boiling point of water?
    Solution
    Hydrogen bonding is the reason for water's abnormally high boiling point.
    Due to intermolecular hyderogen bonds, water molecules associate and require more energy to get separated for vaporization.

  • Question 6
    1 / -0
    Statement 1: Water is a good solvent for ionic and/or polar covalent substance.
    Statement 2 :  Water shows hydrogen bonding between oxygen atoms.
    Solution
    Statement 1: Water is a good solvent for ionic and/or polar covalent substance. This is because water is a polar covalent compound. Also, like dissolves like.
    Statement 2 :  Water shows hydrogen bonding between oxygen and hydrogen atoms. Hydrogen bonding is observed when H atom is attached to electronegative atom such as N, O or F.
    Statement 1 is correct but Statement 2 is not correct.
  • Question 7
    1 / -0
    Statement 1 : The reaction of hydrogen with oxygen to form water is an exothermic reaction.
    Statement 2: Water molecules have polar covalent bonds.
    Solution
    Statement 1 : The reaction of hydrogen with oxygen to form water is an exothermic reaction.
    In an exothermic reaction, the energy of reactants is higher than the energy of products. Energy is given out during exothermic reaction.
    Statement 2: Water molecules have polar covalent bonds.
    The electronegativities of O and H significantly differ. Due to this, the covalent bond has polar nature.
    Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.
  • Question 8
    1 / -0
    Which of the following is useful in explaining the polarity of water?
    I. The solution process.
    II. The ionization process.
    III. The high conductivity of distilled water
    Solution
    I and II is useful in explaining the polarity of water.
    I. The solution process.
    II. The ionization process.

    On the other hand III is not useful.
    III. The high conductivity of distilled water.
  • Question 9
    1 / -0
    What is the pH if $$[H_3O^+] = 3.5 \times 10^{ -4} $$ M?
    Solution
    $$\displaystyle   [H_3O^+] = 3.5 \times 10 ^{-4}M$$
    $$\displaystyle  pH = -log [H_3O^+] = -log 3.5 \times 10 ^{-4} = 3.5$$
  • Question 10
    1 / -0
    _______ is used in nuclear reactors to slow down their speed and release nuclear energy.
    Solution
    Heavy water (deuterium oxide $$D_2O$$) is used as a moderator in nuclear reactors to slow down their speed and release nuclear energy.
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