Question

Which one fall in the category of a pure substance -ice,milk,iron,hydrochloric acid,calcium oxide,mercury,brick,wood?

Answer 1

HCl,calcium oxide,mercury,....

Answer 2

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

$\sf\red{★Iron}$

$\sf\red{★Ice}$

$\sf\red{★Hydrochloric\:acid}$

$\sf\red{★Calcium\:oxide}$

$\sf\red{★Mercury}$