MCQ
Coal tar is main source of
- ✓Aromatic compounds
- BAliphatic compounds
- CCycloalkanes
- DHeterocyclic compounds
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$(R=8.314\,J\, mol^{-1}\,K^{-1})$

Assertion $A :$ The amphoteric nature of water is explained by using Lewis acid/base concept.
Reason $R$ : Water acts as an acid with $NH _{3}$ and as a base with $H _{2} S$.
In the light of the above statements choose the correct answer from the options given below :