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Chemistry : Atoms, Molecules, Elements and Compounds


Answer the following questions by choosing the appropriate option.

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Multiple choice

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1.

Isotopes have same atomic number.

  True

  False

 

2.

Of a proton, neutron and an electron, the electron is the lightest.

  True

  False

 

3.

One atom of carbon and two atoms of oxygen combine to form a molecule of carbon dioxide [CO2].

  True

  False

 

4.

Electrons revolve around the nucleus in shells or orbits.

  True

  False

 

5.

Isotopes differ in the number of neutrons they have in their nucleus.

  True

  False

 

6.

Hydrogen and oxygen are combined chemically in a fixed proportion of 2:1 in the compound water.

  True

  False

 

7.

In a neutral atom, the number of electrons and protons is equal.

  True

  False

 

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