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Dear student
option A
​​​​​​ A basic oxide that is insoluble in water is copper-oxide (CuO), as the oxygen in copper-oxide is tightly bounded due to highly electrostatic forces. hence we need an extra amount of energy to make it soluble.
to a greater extent, CuO is insoluble in water.
Other oxides are readily soluble in water and do not form any insolule mass.
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