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Q.

Which of the following oxides will dissolve in water to give an alkaline solution ?

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a

CuO

b

CaO

c

SO2

d

SO3

answer is C.

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Detailed Solution

The metallic oxide when dissolved in water gives an alkaline solution of respective metal hydroxide.

SO2 reacts with water to form Sulphurous acid.

SO3 reacts with water to form Sulphuric acid.

CuO reacts with water to form Copper hydroxide which is a weak base, not an alkali.

CaO gives Calcium hydroxide which is an alkali and a strong base when dissolved in water.

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