24. of substances The following table gives some information about the physical properties S. T.U and Y. Use the information to answer the questions that follow. Substance M.pt Hardness Electrical conductivity Electrical conductivity in solid state in molten state High Hard brittle Good Good T High Hard brittle Poor Poor High Hard brittle Good Poor Low Soft Poor Poor (a) Which of these substances exists as a mk) (i) Giant covalent structure (ii) Giant metallic structure (½ mk) (b) (i) Why is the melting point of V low? (Imks)​