An element undergoes partial combustion with oxygen to form a compound which has no effect on litmus. Identify the element.

Iron

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Magnesium

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Carbon

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Aluminium

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Solution

The correct option is C Carbon
Metals combine with oxygen to form basic oxides. Non-metals combine with oxygen to form acidic oxides. Among the given options, only carbon is a non-metal. It undergoes partial combustion on reaction with oxygen and gives carbon monoxide which is a neutral oxide and has no effect on litmus. The reaction involved is as follows:

$2C(s) + O_{2} (g) \to 2CO(g)$

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