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Question

Metal oxides on reacting with strong acids produce salt and water (similar to the reaction of bases with acids). Hence, metal oxides are also known as basic oxides.

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Solution

Metal oxides are said to be basic oxides because they react with acids in the similar way by which bases reacts with an acid.

i.e base + acid ------>salt +water

e.g. sodium hydroxide + hydrochloric acid ==> sodium chloride + water

NaOH + HCl ==> NaCl + H2O similarly

metal oxides +acid-----> salt + water

e.g. metal oxide + acid ==> salt + water

Black copper (II) oxide dissolves in colourless sulfuric acid to give a blue solution of copper(II) sulfate from which the salt can be crystallised.

copper(II) oxide + sulphuric acid ==> copper(II) sulphate + water

CuO + H2SO4 ==> CuSO4 + H2O


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