What type of mixture is an alloy? Explain.

Name the appropriate method to separate a mixture of calcium sulfate and camphor.

How is the pure liquid separated from a mixture obtained by vapour distillation?

Which of the following substances consists of only one element?

One sample of atmospheric air is found to have $0.03\%$ of carbon dioxide and another sample $0.04\%$. This is evidence that

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A:$ $A$ mixture contains benzoic acid and naphthalene. The pure benzoic acid can be separated out by the use of benzene.
Reason $R:$ Benzoic acid is soluble in hot water.
In the light of the above statements,choose the most appropriate answer from the options given below.