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Astrup Mikkel

If we added CuSO, to above four test tubes, in which test tube we will observe brown residue?1) 'A' and B'2) 'B' and 'D'3) B' and 'C4) Only A​

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89 cents Evelina
Answer:

Black residue will appear due to formation of iron in tubes (II) and (IV) because of displacement reaction taking place and the reaction is given below...

2Al(s)+3FeSO4(aq)→Al2(SO4)3(aq)+3Fe(s) (Black residue)

Zn(s)+FeSO4(aq)→ZnSO4(aq)Fe(s) (Black residue)

I hope this will help you.....

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Evelina
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