MCQ
When petroleum is heated the vapours contain mainly
- AKerosene
- ✓Petroleum ether
- CDiesel
- DMachine oil
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$(i)$ they are polymers with hydrophobic character
$(ii)$ they are biocompatible
$(iii)$ in general, they have high thermal stability and low dielectric strength
$(iv)$ usually they are resistant to oxidation and used as greases.