Final answer:
Non-metal oxides such as Carbon and Sulphur create acidic solutions with pH less than 7 when they dissolve in water.
Explanation:
Carbon and Sulphur are non-metals that form oxides indicating pH values less than seven when exposed to moist pH paper. Non-metal oxides tend to produce acidic solutions with pH below 7 when dissolving in water.
For example, when carbon dioxide (CO2) dissolves in water, it forms carbonic acid, reducing the pH. Similarly, when sulfur dioxide (SO2) reacts with water, it produces sulfurous acid, leading to a decrease in pH levels.
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