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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

{SO}_{2}

d

{SO}_{3}

answer is C.

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Detailed Solution

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

SO₂reacts 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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Which of the following oxides will dissolve in water to give an alkaline solution ?