MCQ
Which of the following statements concern with transition metals ?
- Acompounds containing ions of transition elements are usually coloured
- Bthe most common oxidation state is $+3$
- Cthey easily form complexes
- ✓All of the above
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trans $\left( Ph - CH = CH - CH _3\right) \rightarrow$ cis $\left( Ph - CH = CH - CH _3\right)$
${C_6}{H_6}(l)\, + \,\frac{{15}}{2}\,{O_2}(g)\, \to \,6\,C{O_2}(g)\, + \,3{H_2}O\,(g)$
Signs of $\Delta H,\,\Delta S$ and $\Delta G$ for the above reaction will be
$A$ (predominantly) is