Which one of the following processes involves | vedclass

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(D) chemical reaction involves the formation of new substances with different chemical properties.$A$. Storing oxygen gas under pressure is a physical

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Heating copper wire in presence of air at high temperature

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(D) chemical reaction involves the formation of new substances with different chemical properties.$A$. Storing oxygen gas under pressure is a physical change as it only changes the state of the gas.$B$. Liquefaction of air is a physical process involving changes in temperature and pressure.$C$. Keeping petrol in an open dish is a physical process of evaporation.$D$. Heating copper wire in the presence of air at high temperature leads to the formation of copper$(II)$ oxide $(2Cu + O_2 \rightarrow 2CuO)$. This is a chemical reaction because a new substance is formed.

Which one of the following processes involves chemical reactions?

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