Read the given paragraph and answer the questions.
(4)
The next problem faced by scientists was to give appropriate explanations of this laws.British
chemist John Dalton provided the basic theory about the nature of matter. Dalton picked up
the idea of divisibility of matter, which was till then just a philosophy. He took the name
'atoms' as given by the Greeks and said that the smallest particles of matter are atoms. His
theory was based on the laws of chemical combination. Dalton's atomic theory provided an
explanation for the law of conservation of mass and the law of definite proportions. According
to Dalton's atomic theory, all matter, whether an element, a compound or a mixture is
composed of small particles called atoms. The postulates of this theory may be
Stated as follows:
All matter is made of very tiny particles called atoms, which participate in chemical
reactions.
(ii) Atoms are indivisible particles, which cannot be created or destroyed in a chemical
reaction.
(iii) Atoms of a given element are identical in mass and chemical properties.
(iv) Atoms of different elements have different masses and chemical properties.
(v) Atoms combine in the ratio of small whole numbers to form compounds.
(vi) The relative number and kinds of atoms are constant in a given compounds.
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1) True
2) True
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4) True
5) True
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