Q17 of 21 Page 6

Why do we need to clean the metals with sandpaper prior to the experiment?

Metals may contain some impurities prior to experiment. These impurities can cause hindrance during reaction so to get proper observation metals are cleaned with sandpaper.


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15

Why is salt used in determining the reactivities of metals?

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What will happen if a less reactive metal reatcs with a salt of higher reactive metal?

 18

Complete the following reactions-

i. Cu + Al2(SO4)3 ⇒


ii. Cu + CuSO4 ⇒


iii. Zn + FeSO4⇒

 19

Can Copper displace hydrogen from acids & water?