Which one of the statements is correct for the process of melting of ice ?

(a) At melting point only ice exists.(b) At melting point only water exists. (c) At melting point both ice and water exists. (d) None of the above.-----------------------The crystals of copper sulphate turn white on heating due to 1 (a) Loss of sulphate ions. (b) Loss of copper ions. (c) Loss of water of crystallization. (d) Decomposition of copper sulphate.