Question

which one of the following doesn't give corresponding metallic oxides, nitrogen dioxide and oxygen on heating

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Answer 1

Explanation:

All nonmetals form covalent oxides with oxygen, which react with water to form acids or with bases to form salts. Most nonmetal oxides are acidic and form oxyacids, which in turn yield hydronium ions (H3O+) in aqueous solution. There are two general statements that describe the behaviour of acidic oxides. First, oxides such as sulfur trioxide (SO3) and dinitrogen pentoxide (N2O5), in which the nonmetal exhibits one of its common oxidation numbers, are known as acid anhydrides. These oxides react with water to form oxyacids, with no change in the oxidation number of the nonmetal; for example,

N2O5 + H2O → 2HNO3.

Second, those oxides in which the metal does not exhibit one of its common oxidation numbers, such as nitrogen dioxide (NO2) and chlorine dioxide (ClO2), also react with water. In these reactions, however, the nonmetal is both oxidized and reduced (i.e., its oxidation number is increased and decreased, respectively). A reaction in which the same element is both oxidized and reduced is called a disproportionation reaction. In the following disproportionation reaction, N4+ is reduced to N2+ (in NO) and oxidized to N5+ (in HNO3).

3NO2 + H2O → 2HNO3 + NO