Chemistry Practice Question and Answer

Q:

What is liberated when the base is dissolved in water?

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  • 1
    (OH) - ion
    Correct
    Wrong
  • 2
    H + ion
    Correct
    Wrong
  • 3
    Both ions
    Correct
    Wrong
  • 4
    No ion
    Correct
    Wrong
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Answer : 1. "(OH) - ion"

Q:

A fermentation of grapes?

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  • 1
    chemical change is
    Correct
    Wrong
  • 2
    physical change
    Correct
    Wrong
  • 3
    Both chemical and physical changes
    Correct
    Wrong
  • 4
    Others
    Correct
    Wrong
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Answer : 1. "chemical change is"

Q:

Milk is a natural 

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  • 1
    Solution
    Correct
    Wrong
  • 2
    Mixture
    Correct
    Wrong
  • 3
    Suspension
    Correct
    Wrong
  • 4
    Emulsion
    Correct
    Wrong
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Answer : 4. "Emulsion "

Q: The carbon tetrachloride molecule (CCl4) is 1538 0

  • 1
    a nonpolar molecule with polar bonds
    Correct
    Wrong
  • 2
    a nonpolar molecule with nonpolar bonds
    Correct
    Wrong
  • 3
    a polar molecule with polar bonds
    Correct
    Wrong
  • 4
    a polar molecule with nonploar bonds
    Correct
    Wrong
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Answer : 1. "a nonpolar molecule with polar bonds"
Explanation :

Answer: A) a nonpolar molecule with polar bonds Explanation: The four bonds of carbon tetrachloride (CCl4) are polar, but the molecule is nonpolar because the bond polarity is cancelled by the symmetric tetrahedral shape. Hence, making the net dipole as zero and molecule as non-polar.   When other atoms substitute for some of the Cl atoms, the symmetry is broken and the molecule becomes polar.

Q:

Permanent hardness of water may be removed by the addition of

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  • 1
    sodium carbonate
    Correct
    Wrong
  • 2
    alum
    Correct
    Wrong
  • 3
    potassium permanganate
    Correct
    Wrong
  • 4
    lime
    Correct
    Wrong
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Answer : 1. "sodium carbonate"

Q:

The gas used for artificial fruit ripening of green fruit is 

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  • 1
    Ethane
    Correct
    Wrong
  • 2
    Ethylene
    Correct
    Wrong
  • 3
    Methane
    Correct
    Wrong
  • 4
    Acetylene
    Correct
    Wrong
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Answer : 4. "Acetylene "

Q:

Which of the below allotropes of carbon is in the form of geodesic globe?

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  • 1
    Fullerene
    Correct
    Wrong
  • 2
    Carbon nanotube
    Correct
    Wrong
  • 3
    Graphite
    Correct
    Wrong
  • 4
    Diamond
    Correct
    Wrong
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Answer : 1. "Fullerene "

Q:

Approximate pH value of lemon juice?

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  • 1
    10
    Correct
    Wrong
  • 2
    2.2
    Correct
    Wrong
  • 3
    12
    Correct
    Wrong
  • 4
    14
    Correct
    Wrong
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Answer : 2. "2.2"

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