MCQ
Which of the following is not correct about transition metals
- ATheir melting and boiling points are high
- BTheir compounds are generally coloured
- CThey can form ionic or covalent compounds
- ✓They do not exhibit variable valency
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$2Fe(s)\, + \,{O_2}\,(g)\, + \,4{H^ + }(aq)\, \to \,2F{e^{2 + }}(aq) + 2{H_2}O(l)\,;$ $E^o =1.67\,V$
At $[Fe^{2+}] = 10^{-3}\, M$, $p(O_2) = 0.1\,atm$ and $pH = 3$, the cell potential at $25\,^oC$ is .............. $\mathrm{V}$


