MCQ
Petroleum is mainly a mixture of
- ✓Alkanes
- BCyclohexane
- CBenzenoid hydrocarbons
- DAlkenes
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$[Cr(NH_3)_6] [Cr(NO_2)_6]$ and $[Cr(NH_3)_4(NO_2)_2] \,[Cr(NH_3)_2(NO_2)_4]$