A `Zn` rod weighing `1.0g` is taken in `100mL` of `1M CuSO_(4)` solution . After some time, `[Cu^(2+)]` in solution `=0.9M(` atomic weight of `Zn=65.5g)`. Which of the following statements is `//` are correct ?
`a. 0.655g` of `Zn` was lost during the reaction.
`b. 0.327 g `of `Zn` was lost during the reaction .
`c.` There is no change in the molarity of `SO_(4)^(2-)` ion.
`d.` There is a change in the molarity of `SO_(4)^(2-)` ion.