Question

which of the following materials falls in the category of a "pure substance"? 1)ice, (2)milk, (3)iron, (4)hydrochloric acid, (5)calcium oxide, (6)mercury, (7)wood, (8)air​

Answer 1

Answer:

Other than any substance ice is only the pure substance and all other substance are mixture for example hydrochloric acid it is solution of hydrogen chloride and formula is HCI

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Answer 2

Following substance from the above mentioned list are pure substance :

$\sf\red{★Iron}$

$\sf\red{★Ice}$

$\sf\red{★Hydrochloric\:acid}$

$\sf\red{★Calcium\:oxide}$

$\sf\red{★Mercury}$