MCQ
Which of the following has highest electrode potential
- A$Li$
- B$Cu$
- ✓$Au$
- D$Al$
$\text { Electrode potential : }-1.70 \quad-2.37\quad -2.87\quad -2.89 \quad -2.90$
$Be$ has the highest electrode potential as it is the least electropositive among the given metals.
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$B$ will be
| Acid | $K_a$ |
| $HCN$ | $6.2\times 10^{-10}$ |
| $HF$ | $7.2\times 10^{-4}$ |
| $HNO_2$ | $4.0\times 10^{-4}$ |
Correct order of increasing base strength of the base $CN^-,F^-$ and $NO_2^-$ will be