MCQ
A solution turns phenolphthalein indicator pink. The most likely pH of this solution will be:
- A6
- B4
- ✓9
- D7
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| Student | Metal | Solution | Colour change of solution | Deposit/Coating obtained |
| $A$ | $Fe$ | $\ce{ZaSO_4}$ | Turned green | Silvery grey coating |
| $Zn$ | $\ce{FeSO_3}$ | No change | No change | |
| $B$ | $Fe$ | $7\Omega \ce{OO_4}$ | No change | Black deposit |
| $Zn$ | $\ce{FeSO_4}$ | Colour faded | Grey coating | |
| $C$ | $Fe$ | $\ce{ZnSO_4}$ | No change | No change |
| $Zn$ | $\ce{FeSO_4}$ | Turned colourless | Black deposit | |
| $D$ | $Fe$ | $\ce{ZnSO_4}$ | No change | Grey deposit |
| $Zn$ | $\ce{FcSO_4}$ | No change | Black deposit |