An oxide solution of which of the following elements will turn blue litmus red?

The element name are not visible in question.
The oxides of non-metal form acid with water. Acid turns blue litmus to red. So, oxide solution of non-metals turns blue litmus to red.
For example carbon is  non-metal. Its oxide carbon-dioxide will form carbonic acid with water. The solution turns blue litmus paper red.
CO2 + H2H2CO3

 

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acidic solution turns blue litmus to red

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The oxides of non-metal forms acidic oxides which turns blue litmus paper red.

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non-metals,because oxides of non metal are acidic in nature.so it will turn blue litmus red.

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