Statement I: Non-metallic oxides are usually basic anhydrides.
Statement II: Non-metallic oxides form acids when placed in water.

Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I.

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Both Statement I and Statement II are correct, but Statement II is not the correct explanation of Statement I.

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Statement I is correct, but Statement II is incorrect.

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Statement I is incorrect, but Statement II is correct.

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Solution

The correct option is D Statement I is incorrect, but Statement II is correct.
The first statement is false.
Basic anhydrides are metallic oxides. They are formed when the water molecule is removed from the bases. Example, when a water molecule is removed from the base $, C a (O H)_{2}$ , we are left with $C a O$ . $C a$ is a metal and $C a O$ is a metallic oxide or a basic anhydride.
The second statement is true.
Non-metallic oxides form acids with water. Example, Sulphur dioxide is a non-metallic oxide. When it reacts with water, it forms Sulphurous acid. The reaction is given as-
$S O_{2}$ $+$ $H_{2} O$ $=$ $H_{2} S O_{3}$

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Statement I: Non-metallic oxides are usually basic anhydrides.Statement II: Non-metallic oxides form acids when placed in water.

Statement I: Non-metallic oxides are usually basic anhydrides.
Statement II: Non-metallic oxides form acids when placed in water.