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Question

Statement 1: Basic anhydrides react in water to form bases.
Statement 2: Metallic oxides react with water to form solutions that have an excess of hydroxide ions.

A

Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.

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B

Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.

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C

Statement 1 is correct but Statement 2 is not correct.

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D

Statement 1 is not correct but Statement 2 is correct.

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Solution

The correct option is A

Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.


A basic anhydride reacts with water to form a base; e.g., calcium oxide CaO reacts with water to form calcium hydroxide, Ca(OH)2 which provides an excess of hydroxide ions in solution. Basic anhydrides are simply metal oxides, like sodium oxide (Na2O) or magnesium oxide (MgO). The term basic anhydride, refers the idea that these metal oxides are, bases with a water removed. For example, calcium oxide (CaO) is simply calcium hydroxide Ca(OH)2 with one H2O removed from the formula.

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