When did you finally stoped heating Cu and sulfur mixture in chemical reaction of copper lab?...

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Chemistry

When did you finally stoped heating Cu and sulfur mixture inchemical reaction of copper lab? Which of the following are redoxreactions ?

Explain your answer on the basis of changes in oxidation number.1. CuSO4 + 2NaOH → Cu(OH) 2 + Na 2SO4

2. 2Al + 3MgSO4 → 3Mg + Al 2(SO4)3

3. 2(NH4)3PO4 + 3Ba(NO3)2 → Ba 3(PO4)2 + 6NH4NO3

4. 2HNO3 + 3H3AsO3 → 2NO + 3H 3AsO4 + H2O

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