Question

15. (a) Name the apparatus by which a mixture of oil and water can be separated
(b) What is aqua regia?
(c) Name two elements which are liquid at room temperature.​

Answer 1

Explanation:

a ). A separating funnel is used to separate the mixture of oil and water.

b ) . a mixture of concentrated nitric and hydrochloric acids. It is a highly corrosive liquid able to attack gold and other resistant substances.

c ) . The only liquid elements at standard temperature and pressure are bromine (Br) and mercury (Hg). Although, elements caesium (Cs), rubidium (Rb), Francium (Fr) and Gallium (Ga) become liquid at or just above room temperature.

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Answer 2

Answer:

The apparatus is separating funnel

it is a mixture of concentrated nitric acid and hydrochloric acid which can dissolve gold

Mercury and bromine