$A$ mixture of sulphur and carbon disulphide is

$(a)$ Compare metals and non-metals based on their physical properties. (any four points)
$(b)$ What are metalloids? Give two examples.
$(c)$ Identify metals from the following: Boron,sodium,mercury,carbon.

Why is the interconversion of states of matter considered a physical change? Give three reasons to justify your answer.

Salt can be recovered from its solution by evaporation. Suggest some other technique for the same?

$(i)$ Name the process or the separation technique you would follow to separate:
$(a)$ Dyes in black ink
$(b)$ Butter from cream
$(c)$ Ammonium chloride and common salt
$(d)$ Iron filings and sand
$(ii)$ State the principle used in separation by centrifugation.

Which of the following is a homogeneous mixture?