Q4 of 64 Page 112

Write true or false for the following statements:

In water, the ratio of the mass of hydrogen to the mass of oxygen is always 1:8, whatever is the source of water.

True

According to the postulates of Dalton’s atomic theory atoms of different elements combine in fixed ratios to form compounds. So, in water, the ratio of the mass of hydrogen to the mass of oxygen is always 1:8, whatever is the source of water.


Hence, the above statement is true.


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2

Write true or false for the following statements:

Atoms of a given element are identical in mass but different in their chemical properties.

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Write true or false for the following statements:

Atoms combine in the ratio of small whole numbers to form compounds.

 5

Write true or false for the following statements:

In a chemical substance, the elements are always present in varying proportions by mass.

 6

Write true or false for the following statements:

One atomic mass unit is a mass unit equal to exactly one-twelfth (1/12th) the mass of one atom of carbon-12.