MCQ
The lightest metal is
- ✓$Li$
- B$Mg$
- C$Ca$
- D$Na$
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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 :
