Chemistry, asked by Anonymous, 11 months ago

which of the following involve a chemical reaction
1. evaporation of water
2.storing rhe nitrogen gas under pressure
3.keeping petrol In A. dish I'm open
4.heating magnesium wire In their presence of aur at high pressure ​

Answers

Answered by nigadevaishnav
1

Answer:

4.heating magnesium

Explanation:

when the chemical composition of matter changes during the reaction and changes are permanent in nature then it is called chemical reaction. So,when magnesium is heated it burns. Therefore heating magnesium is chemical reaction.

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