Chemistry General Knowledge Questions Practice Question and Answer

Q:

The atomic mass of an element has the maximum number of electrons in its second orbit—

1668 0

  • 1
    2
    Correct
    Wrong
  • 2
    8
    Correct
    Wrong
  • 3
    10
    Correct
    Wrong
  • 4
    16
    Correct
    Wrong
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Answer : 2. "8"

Q:

Washing soda is the common name for

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  • 1
    Calcium carbonate
    Correct
    Wrong
  • 2
    Sodium carbonate
    Correct
    Wrong
  • 3
    Calcium bicarbonate
    Correct
    Wrong
  • 4
    Sodium bicarbonate
    Correct
    Wrong
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Answer : 2. "Sodium carbonate"

Q:

Crystallization is an example of

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  • 1
    Physical change
    Correct
    Wrong
  • 2
    Chemical Transformation
    Correct
    Wrong
  • 3
    Chemical reaction
    Correct
    Wrong
  • 4
    Galvanization
    Correct
    Wrong
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Answer : 1. "Physical change"

Q: The carbon tetrachloride molecule (CCl4) is 1554 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:

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:

The chemical name of limestone is? 

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  • 1
    Sodium Chloride
    Correct
    Wrong
  • 2
    Sodium Sulphide
    Correct
    Wrong
  • 3
    Calcium carbonate
    Correct
    Wrong
  • 4
    Magnesium Chloride
    Correct
    Wrong
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Answer : 3. "Calcium carbonate "

Q:

The melting point of tungsten is____.

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  • 1
    3,083 ° C
    Correct
    Wrong
  • 2
    3,830 ° C
    Correct
    Wrong
  • 3
    3,380 ° C
    Correct
    Wrong
  • 4
    3,308 ° C
    Correct
    Wrong
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Answer : 3. "3,380 ° C"

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