Question

7.
Which of the following materials fall in the category of a "pure
substance"?
(a) Ice
(b) Milk
(C) Iron
(d) Hydrochloric acid
(e) Calcium oxide
(f) Mercury
(g)Brick
(h) Wood
(i) Air.
pls answer fast it's really important...​

Answer 1

Answer:

hcl and milk I think so

Explanation:

brainliest ok

Answer 2

•Following substance from the above mentioned list are pure substance :

$\sf\red{★Iron}$

$\sf\red{★Ice}$

$\sf\red{★Hydrochloric\:acid}$

$\sf\red{★Calcium\:oxide}$

$\sf\red{★Mercury}$