Which of the following will turn blue litmus to red?

Magnesium oxide

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Sulphur dioxide

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Copper oxide

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Sodium oxide

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Solution

The correct option is B Sulphur dioxide
Non-metals on reaction with oxygen gas form non-metallic oxides. These non-metallic oxides upon reaction with water form acids. So, non-metal oxides are acidic oxides. Hence, a non-metal oxide will turn blue litmus to red.

Here, only sulphur dioxide is a non-metal oxide. While oxides of magnesium, sodium, and copper are metal oxides that are basic in nature.

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