MCQ
What is the role of phosphate ion in a detergent?
- AIt reduces $pH$ of the water
- BIt increases $pH$ of the water
- ✓It removes $\mathrm{Ca}^{2+}$ and $\mathrm{Mg}^{2+}$ ions from water that causes hardness
- DIt increases its solubility in water
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$CuI_{(s)} + e^{\circleddash} \to Cu_{(s)} + I^{\circleddash}_{(aq)}$ ; $E^o = -0.17\, V$
$Zn^{+2}_{(aq)} + 2e^{\circleddash} \to Zn_{(s)}$ ; $E^o = -0.76\, V$