Question

.PLEASE ANSWER IT FASTLY ITS ALREADY TIME UP ALL ATE GOING TO BED FAST..................Give reason....○All decomposition reactions are endothermic reactions. ○Colour of CuSO4 changes, when iron nail dipped in CuSO4.

Answer 1

Hey mate,, here is ur ans..

• Almost every decomposition reaction is endothermic since energy is required to break bonds or decomposition of a compound.

• the colour of copper sulphate solution change when iron nail is dipped in it because in the reaction iron has replaced copper frm its solution.thus the amount of copper decreases n the colour fades.its colour changes to green frm blue..

              CuSO₄ + Fe ⇒ FeSO₄ + Cu

#hope it helps

Answer 2

Hello user

Because energy is needed to break the bonds of the compound in order to decompose it so All decomposition reactions are endothermic reactions.

Ans 2... CuSO4 + Fe ----------- FeSO4 + Cu

Fe being more reactivr than Cu displaces Cu from CuSO4 and then form FeSO4 which gives the green color to solution