identify the oxides from the following which will turn red litmus to blue

CO2,Na2O,CAO,SO2,NO2

WHAT IS THE NATURE OF THESE OXIDES?

Among the given oxides, carbon dioxide (CO2) sulphur dioxide (SO2) and nitrogen dioxide (NO2) are acidic in nature. Hence they will turn blue litmus paper red. On the other hand, calcium oxide CaO and Na2O are basic in nature. Hence these oxides will turn red litmus paper blue. 

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Na2O,SO2 will turn red litmus blue as their nature is basic

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oxides are generally acidic whereas hydroxides are generally acidic

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hydroxides are basic

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co2 , so2 , no2

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