MCQ
Nitric acid oxidises phosphorus to
- A${H_2}{P_2}{O_7}$
- B${H_3}P{O_3}$
- C$AgN{O_3}$
- ✓$NO_2$
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(Atomic number of $Zn =30,\,Ni =28$ and $Cr =24$ )

$\text { A } \quad\quad\quad\quad\quad \text { B } \quad\quad\quad\text { C } \quad\quad\quad\quad\text { D }$
$1 \times 10^{-4} \quad 2 \times 10^{-4} \quad 0.1 \times 10^{-4} \quad 0.2 \times 10^{-4}$
(Where $E$ is the electromotive force)
Which of the above half cells would be preferred to be used as reference electrode?
