Question

which of the following are pure substances?
ice, milk ,iron ,hydrochloric acid ,calcium ,oxide ,mercury brick, wood & air

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Answer 1

Answer:

ice,iron hydrochloride acid, calcium

Answer 2

Following substance from the above mentioned list are pure substance :

$\sf\red{★Iron}$

$\sf\red{★Ice}$

$\sf\red{★Hydrochloric\:acid}$

$\sf\red{★Calcium\:oxide}$

$\sf\red{★Mercury}$