Question

Classify the following whether Displacement, direct

combination,decomposition,neutralization or double decomposition reactions. [5]

1. NaCl + AgNO3 AgCl +NaNO3

2. CaCO3 CaO + CO2

3. KOH +HCl KCl +H2O

4. CO2+H2O H2CO3

5. Zn +CuSO4 ZnSO4+Cu​

Answer 1

Answer:

1.  double decomposition

2. decomposition

3. neutralization reaction

4. direct combination

5. displacement

Explanation:

1. If NaCl is reacted with AgNO3 then,

the resultants are Na + NO3 & Ag + Cl or NaNO3 + AgCl,  

therefore it is a double decomposition reaction.

2. As the compound CaCO3 is broken down into CaO & Co2,

therefore it is a decomposition reaction.

3. As the acid HCl is nutralized by the base KOH forming KCl (salt) & H2O (water),  

therefore it is a neutralization reaction.

4. When nonmetal oxide (CO2) & water (H2O) are reacted they vigorously form oxyacids (H2CO3). Therefore it is a direct combination reaction.

5. In this reaction more reactive Zn displaces Cu from CuSO4 to form ZnSO4. Therefore it is a displacement reaction.