what is the general nature of non metal oxides
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When non-metals react with oxygen the non-metallic oxide is formed. Non-metallic oxides are acidic. They form an acidic solution when dissolved in water, turning litmus solution to red colour.
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Oxides of non-metals are generally of acidic nature. For example, when sulphur burns in air it reacts with oxygen of air to form an acidic oxide called sulphur dioxide. This oxide of sulphur is acidic as when it is dissolved in water then it forms an acid called sulphurous (H2SO3) acid.
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