Answer:
(i) \[HCl\,(aq)\] ? Acid (Arrhenius
concept and Bronsted - Lowry concept)
(ii) \[N{{H}_{3}}\,(g)\] ? Base
(Bronsted concept and Lewis concept)
(iii) \[N{{a}_{2}}C{{O}_{3}}\,(aq)\]
? Base (Bronsted concept)
(iv) \[C{{H}_{3}}COOH\,(aq)\] ?
Acid (Arrhenius concept and Bronsted concept)
(v) \[C{{O}_{2}}(g)\] ? Acid
(Bronsted concept and Lewis concept)
(vi) \[B{{F}_{3}}\] ? Acid
(Lewis concept)
(vii)\[A{{g}^{+}}\] ? Acid
(Lewis concept)
(viii) \[C{{N}^{-}}\] ? Base
(Lewis concept)
(ix) \[{{H}_{2}}O\] ? Both acid
and base, i.e., amphoterric (Bronsted concept)
(x) \[{{H}_{2}}S{{O}_{4}}\] ?
Both acid and base, i.e., amphoterric (Bronsted concept)
(xi) \[HCO_{3}^{-}\]? Both acid
and base, i.e., amphoteric (Bronsted concept)
(xii) \[Si{{F}_{4}}\]? Acid
(Lewis concept), as silicon can expand its octet (Refer to page 7/107).
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