Question

identify following reaction as : displacement/ double displacement/ combination/ decomposition reaction. CaO + H₂O gives Ca(OH)₂ + heat . Zn + H₂SO₄ gives ZnSO_​4 + H₂ . 2AgBr gives 2Ag + Br₂ . pb(NO₃)₂ +2Kl gives pbl₂ + 2KNO₃ .

Answer 1

Dear student

1.CaO + H₂O $\to$ Ca(OH)₂ + Heat
This is a combination reaction , as here two reactants combine to form a product.


2. ​Zn + H₂SO₄ $\to$ ZnSO_​4 + H<sub>2
This is a displacement reaction, as here Zn replaces Hydrogen from sulphuric acid and forms Zinc sulphate, along with release of hydrogen.

3.</sub>2AgBr $\to$ 2Ag + Br<sub>2
This is a decomposition reaction as AgBr decomposes to Ag and Br2 in the reaction

4.</sub> Pb(NO₃)₂ +2Kl $\to$PbI₂ + 2KNO₃
This is a double displacement reaction, as here Pb displaces, I from KI and forms PbI₂ and KNO₃ is formed by displacing Nitrate form the lead compound.

Regards