Question

Four test tubes A, B, C and D are taken. In test tube A iron nail is dipped in copper sulphate solution. In test tube B copper wire is dipped in ferrous sulphate solution. In test tube C zinc metal is dipped in ferrous sulphate solution and in test tube D iron nail is dipped in zinc sulphate solution. The reactivity order has been found to be Zn > Fe > Cu. In which test tubes was the colour change observed ? (a) A and C (b) A and B (c) B and C (d) B and D ​

Answer 1

Answer:

a) A and C

Explanation:

In test tube A, iron (Fe) displaces copper (Cu) from copper sulphate solution because Fe is above Cu in the reactivity series. Likewise, zinc (Zn) displaces iron (Fe)

Answer 2

Answer:

answer a is correct A and C