MCQ
The lightest gas which is non$-$inflammable is:
- A$H_2$
- ✓$He$
- C$N_2$
- D$Ar$
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$(A)\,{{C}_{8}}{{H}_{10}}\xrightarrow{KMn{{O}_{4}}}(B){{C}_{8}}{{H}_{6}}{{O}_{4}}\xrightarrow[Fe]{B{{r}_{2}}}{{C}_{8}}{{H}_{5}}Br{{O}_{4}}(C)$ (one-product only)
Reason: The electrical conductivity of metals is due to motion of electrons.