Question 4(c)Give a balanced chemical equation for the following :(i) Exothermic reaction that is also a combination reaction.(ii) A decomposition reaction involving salt of zinc.(iii) A double decomposition reaction where a white precipitate is formed.

Question

Question 4(c)Give a balanced chemical equation for the following :(i)	Exothermic reaction that is also a combination reaction.(ii) A decomposition reaction involving salt of zinc.(iii) A double decomposition reaction where a white precipitate is formed.

Accepted Answer

(i) When carbon burns in oxygen to form carbon dioxide, lot of heat is produced. It is also a combination reaction.

C + O₂ ↑ ⟶ CO₂ ↑ + Heat

(ii) Zinc carbonate decomposes to form zinc oxide and releases carbon dioxide gas.

ZnCO₃ $\xrightarrow{\space \Delta \space}$ ZnO + CO₂ ↑

(iii) Formation of white precipitate of silver chloride on mixing sodium chloride solution and silver nitrate solution is a double decomposition reaction.

AgNO₃ + NaCl ⟶ AgCl ↓ + NaNO₃

Model Question Paper — 2 — Question 7

Question 4(c)