Question

which of the following material falls in the category of pure substance:​

Answer 1

Ice, iron, hydrochloric acid, calcium oxide, mercury are pure substances as they have definite composition. Brick and air are made up of more than one substance hence they also don't fall in the category of pure substances.

i hope this can help u

Answer 2

Answer:

Which of the following materials fall in the category of a “pure substance”? (i) Air. Ans. Pure substances are: Ice, iron, hydrochloric acid, calcium oxide and mercury.