InterviewSolution
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InterviewSolution
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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. |
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Answer» Correct Answer - a,c `a. mEq.` of `Cu^(2+)` before reaction ltbr. `=100xx1xx2 ` `(n` factor for `Cu^(2+)=2)` `=200` `mEq` of `Cu^(2+)` after reaction `=100xx0.9xx2=180` `mEq` of `Cu^(2+)` lost `=200-180=20` `mEq` of `Zn` lost `=20` Weight of `Zn` lost `=mEqxx10^(-3)xxEw` of `Zn` `=90xx10^(-3)xx(65.5)/(2)` `(n` factor for `Zn=2)` `=0.655g` `c.` There is no change in the molartiy of `SO_(4)^(2-)` ions, since `SO_(4)^(2-)` ions have not been oxidized and there is no change is the volume of solution . |
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