Which of the following methods is adopted to obtain gasoline from crude oil?

What type of mixture is an alloy? Explain.

Give the technique for the separation of the following:
$(i)$ Mixture of sugar and sand
$(ii)$ Mixture of kerosene and water
$(iii)$ Mixture of benzene and common salt
$(iv)$ Mixture of liquids with boiling points $356 \, K$ and $365 \, K$
$(v)$ Mixture of aniline and camphor

Which of the following substances undergoes sublimation?

$A$ mixture of $NH_4Cl$ and $NaCl$ can be separated by

Define an element and provide examples.