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Question

Which of the following are molecules of compounds?
I) Carbon dioxide​
II) Chlorine​
III) Hydrogen chloride


A
Only II
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B
I, II, and III
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C
Only I
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D
Both I and III
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Solution

The correct option is D Both I and III

Carbon dioxide (CO2)

  • It has one carbon atom and two oxygen atoms.

  • Since it is made up of different kinds of atoms, it is a molecule of compound.

Chlorine (Cl2)

  • It has two chlorine atoms.

  • Since it is made up of the same kind of atoms, it is a molecule of element.

Hydrogen chloride (HCl)

  • It has one hydrogen atom and one chlorine atom.

Since it is made up of different kinds of atoms, it is a molecule of compound.

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