A.  Both mixtures and compounds always contain a fixed proportion of elements by mass.

        B.  Unlike compounds, very little or no exchange of energy occurs during the formation of mixtures.

        C.  A mixture cannot be easily separated into its constituents while constituents of a compound can be easily separated.

        D.  Compounds and mixtures can be separated into its constituents by chemical methods.

        A.  A substance which contains two or more elements physically combined together in fixed ratio.

        B.  A substance which contains only metallic and non-metallic elements chemically joined together.

        C.  A substance which cannot be separated into its simpler substances by heating alone.

        D.  A substance which is made up of two or more elements chemically joined together.

        A.  Glass

        B.  Diamond

        C.  Graphite

        D.  Sodium chloride

        A.  n-hexane and n-heptane

        B.  benzene and toluene

        C.  water and ethanol

        D.  carbon tetrachloride and silicon tetrachloride

        A.  Diamond

        B.  Polythene

        C.  Potassium iodide

        D.  Graphite

        A.  slowly

        B.  rapidly

        C.  freely

        D.  briskly

        A.  0.421 g

        B.  0.183 g

        C.  0.129 g

        D.  0.222 g

        A.  Copper and tin

        B.  Salt and sugar

        C.  Sulfur and sugar

        D.  Salt and copper sulphate

        A.  one

        B.  two

        C.  three

        D.  four

        A.  0.11

        B.  3.7

        C.  6.8

        D.  6.3

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