MCQ
Least chemical activity is shown by
- ANitrogen
- ✓Argon
- CMethane
- DAmmonia
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| Element | $Fe$ | $Co$ | $Ni$ | $Cu$ |
| Metallic radii/pm | $126$ | $125$ | $125$ | $128$ |
take place in two steps :
$(a)$ $Br^{-} + H^{+} + H_2O_2 \xrightarrow{{slow}} HOBr + H_2O$
$(b)$ $HOBr + Br^{-} + H^{+} \xrightarrow{{fast}} H_2O + Br_2$
The order of the reaction is

The product is