1.

Which of the following oxides when dissolved in water gives a solution which turns blue litmus red?

Answer»

`MgO`
`CaO`
`CO_2`
`CuO`

SOLUTION :MgO, CaO and CuO and all METAL oxide. Metal oxides are basic in nature. `CO_2` is a non-metal oxide and its AQUEOUS solution turns blue LITMUS red.


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