MCQ
Which of the following has highest octane number
- An-hexane
- Bn-heptane
- ✓Iso-octane
- Dn-heptane and iso-octane mixed in ratio $ 50 : 50$
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$(I)$ they exhibit high enthalpies of atomisation as the $d-$ subshell is full
$(II)$ $zn$ and $Cd$ do not show variable oxidation states while $Hg$ shows $+ I$ and $+ II$
$(III)$ Compound of $Zn,\,Cd$ and $Hg$, are paramagnetic in nature
$(IV)$ $Zn,\,Cd$ and $Hg$ are called soft metals
