Discussion
An oxide of a substance X reacts with water to produce another substance Y. Y reacts with oxygen to form Z. It is observed that Y turns blue litmus red. Which of the following can be concluded about X, Y and Z?
Answer: D
X is a non-metal, Y is acidic and Z is acidic in nature.
Y turns blue litmus red, so Y is an acid. Oxides that dissolve in water to give acids are oxides of non-metals, so X is a non-metal. Sulphur fits the description:
\[ \begin{aligned} SO_{2} + H_{2}O &\rightarrow H_{2}SO_{3} \\ 2H_{2}SO_{3} + O_{2} &\rightarrow 2H_{2}SO_{4} \end{aligned} \]
Oxidising the acid Y gives another acid, Z (here sulphuric acid). Metal oxides give bases with water, which would turn red litmus blue, so options A and B are wrong. Option C wrongly makes Z basic.
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