Determine the oxidation state of the elements in the formula C2H2.

In this substance, carbon is a more electronegative atom, which means it will have a negative oxidation state. Hydrogen atoms can exhibit only one positive oxidation state – “+1”. If we consider the structural formula of acetylene, we can see that the carbon atoms have the same environment, therefore, their oxidation states should be equal. Taking into account the rule of electroneutrality of molecules, the oxidation state of carbon atoms in acetylene will be “-1”.

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