Question

which of the following material are categorised as pure substance (a) mercury ,(b) milk, (c) calcium oxide ,(d) ink ?

Answer 1

Question ⤵️

Which of the following material are categorised as pure substance (a) mercury ,(b) milk, (c) calcium oxide ,(d) ink ?

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Before answering the question , let us know about the pure substances .

Pure Substances :-

In chemistry, a pure substance is a sample of matter with both definite and constant composition and distinct chemical properties. To avoid confusion, a pure substance is often referred to as a "chemical substance."

Correct Answer : (a) Mercury

Reason :- 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.

Additional Information :-

Semiconductor-grade silicon is the purest sample of any element on earth.