A) \[C{{O}_{2}}\]
B) \[S{{O}_{2}}\]
C) CO
D) Water vapours
Correct Answer: A
Solution :
\[C{{O}_{2}}\] is an acidic oxide and reacts with bases, forming salts. \[Ca{{(OH)}_{2}}+C{{O}_{2}}\xrightarrow{{}}CaC{{O}_{2}}+{{H}_{2}}O\] Solution of \[C{{O}_{2}}\] in water behaves as weak dibasic acid, the solubility in water increases under pressure. This property is used to carbonate drinks (coca-cola etc.) and airated water. \[C{{O}_{2}}+{{H}_{2}}O\xrightarrow{{}}{{H}_{2}}C{{O}_{3}}\] \[{{H}_{2}}C{{O}_{3}}{{H}^{+}}+HCO_{3}^{-}\] (salt \[NaHC{{O}_{3}}\]) \[HCO_{3}^{-}{{H}^{+}}+CO_{3}^{2-}\] (salt\[N{{a}_{2}}C{{O}_{3}}\]) Therefore, \[C{{O}_{2}}\] gas is used in airated water.
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