Question

. What happens when
(a) Dilute sulphuric acid is poured on a copper plate?
(b) Iron nails are placed in copper sulphate solution?
Write word equations of the reactions involved.​

Answer 1

Answer:

(a) When dilute sulphuric acid is poured on a copper plate, copper reacts with acid to give copper sulphate and hydrogen. (b) When iron nails are placed in copper sulphate solution, displacement reaction takes place in which iron displaces copper. The blue colour turns into green.

hope this helps you

Answer 2

Answer:

(a) Copper does not react with dilute sulphuric acid. So, no reaction takes place when dilute sulphuric acid is poured on a copper plate. But when concentrated sulphuric acid is poured over copper plate, effervescence is observed. This happens because of formation of hydrogen gas.

(b) If we put Iron nail into copper sulphate solution, the iron nail will displace copper from copper sulphate solution. The following changes will be observed:

i) The colour of copper sulphate changes from blue to green after putting iron nails in it.  

ii) Reddish brown colour is deposited on the iron nails. This reddish brown colour is of copper.  

Because (Fe) is more reactive than copper (Cu) and is placed above copper in reactivity series of metals, thus and it changes into iron sulphate and copper.

The chemical reaction is given below:  Fe (Iron) + CuSO4 (Copper Sulphate) → FeSO4  (Iron Sulphate) + Cu (Copper)