Question
Write balanced equation for a coloured metallic oxide which dissolves in alkalis to yield colourless solutions.
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Answer
$\underset{\text { (Yellow) }}{ PbO }+2 NaOH \longrightarrow \underset{\begin{array}{c}\text { Sodium Plumbate } \\ \text { (Coloursless, soluble) }\end{array}}{ Na _2 PbO _2+ H _2 O }$
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