The correct statements among the following are:
I. $S n O_{2}$ has an amphoteric character.
II. $O_{3}$ is a linear molecule.
III. Sulphur has oxidation states of +5 and +3 in disulphurous acid.

I, II and III

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I & III only

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III only

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II & III only.

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Solution

The correct option is A I, II and III
(I) Amphoteric oxides are the oxides that react with both acids and bases to form salt and water. Thus, $S n O_{2}$ react with both $H C l$ (an acid) and $N a O H$ (base) to give salt and water.
(II) $O_{3}$ has a bent structure.

(III) The oxidation state of the sulfur atom bonded to 3 oxygen atoms is +5 while the oxidation number of other sulfur atom is +3.

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