plz answer this tomorrow is my exams
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Answer:
4th answer is chemical change
5th answer is reversible changer
Explanation:
4th answer is chemical change because if you take an iron nail and put it in a water glass with supply of oxygen then you'll notice it will be covered with a reddish brown layer this is rust and you cannot change a rusty iron into the pure form of iron. iron is fe but rusted iron becomes
fe2.xh2o
5th answer is reversible change because in it a substance can be reversed in it's original form
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