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Generally metallic oxides are basic and non-metallic oxides are acidic in nature. Solution of which of the following oxides in water will change the colour of blue litmus to red?

$\begin{array}{1 1} \text{(a) sulphur dioxide} \\ \text{ (b) magnesium oxide} \\ \text{ (c) iron oxide} \\ \text{ (d) copper oxide} \end{array} $

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