A) \[Ca{{C}_{2}}{{O}_{4}}+{{H}^{+}}\to C{{a}^{2+}}+H{{C}_{2}}O_{4}^{-}\]
B) \[Al+{{H}_{2}}O+O{{H}^{-}}\to Al{{O}_{2}}+\frac{3}{4}{{H}_{2}}\]
C) \[HgS+NO_{3}^{-}+{{H}^{+}}\to H{{g}^{2+}}+{{H}_{2}}O+....\]
D) All of the above
Correct Answer: A
Solution :
\[Ca{{C}_{2}}{{O}_{4}}+{{H}^{+}}\xrightarrow{{}}C{{a}^{2+}}+H{{C}_{2}}O_{4}^{-}\] It is an acid-base reaction.
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