MCQ
The coinage metals are
- AIron, Cobalt, Nickel
- BCopper and Zinc
- ✓Copper, Silver and Gold
- DGold and Platinum
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$2PhCHO \xrightarrow{{:\mathop O\limits^ \ominus H}}PhC{H_2}OH + PhC\mathop {O_2^ \ominus }\limits^{.\,\,.\,\,} $
the slowest step is :