Which of the following is a pure substance ? [1]
a) Carbon dioxide
b) Hydrogen
c) Silver
d) All of these
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Pure substance is one that does not have any other substance or impurity present in it and cannot be separated into other kinds of matter by physical processes. It can be an element or a compound. Ice, iron, hydrochloric acid, calcium oxide, mercury are pure substances as they have definite composition.
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