Question

suppose water is clear and transparent does it necessary to indicate that is Pure
and unpolluted water

Answer 1

no it is not necessary to indicate that if water is transparent it is pure because certain micro- organism can also be present there

Answer 2

no...we cant say that clear and transparent water is pure and unpolluted water...
because it may contain some disease causing micro organisms and other dissolved impurites....so we cant say that water is pure by colour of water