The correct answer is (3) A-IV, B-III, C-II, D-I.
- Soda water: Soda water is a solution of carbon dioxide \((CO_2)\) gas in water. \(CO_2\) is a colorless, odorless, and tasteless gas that is slightly soluble in water. When \(CO_2\) dissolves in water, it forms carbonic acid \((H_2CO_3)\), a weak acid. The bubbles in soda water are due to the release of \(CO_2\) gas from the solution.
- Sugar solution: A sugar solution is a solution of sugar (sucrose) in water. Sucrose is a white, crystalline solid that is highly soluble in water. When sucrose dissolves in water, it forms a solution that is sweet and viscous. Sugar solutions are used in a variety of foods and beverages, including soft drinks, syrups, and candy.
- German silver: German silver is a solid solution of copper \((Cu)\), nickel \((Ni)\), and zinc \((Zn)\). The exact proportions of \(Cu, Ni\), and \(Zn\) in German silver can vary, but they typically range from 50% to 65% \(Cu\), 15% to 30% \(Ni\), and 5% to 25% \(Zn\). German silver is a white, silvery alloy that is often used as a substitute for silver. It is less expensive than silver, but it is also less durable and tarnishes more easily.
- Air: Air is a solution of various gases, including nitrogen \((N_2)\), oxygen \((O_2)\), carbon dioxide \((CO_2)\), and argon \((Ar)\). \(N_2\) makes up about 78% of the atmosphere, \(O_2\) makes up about 21%, \(CO_2\) makes up about 0.04%, and \(Ar\) makes up about 0.93%. The other gases in the atmosphere are present in trace amounts. Air is a colorless, odorless, and tasteless gas that is essential for life. It is used for respiration, and it also plays a role in regulating the Earth's climate.
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