Question

i. Classify the following reactions into different types:
a. AgNO_3(aq) + NaCl(aq) →AgCl_(s) + NaNO₃(aq)
b. CaO_(s) + H₂O(l) → Ca(OH)2(aq)
c. 2KClO_3(s) →2KCl_(s) + 3O_2(g)

ii. Which of the above reaction(s) is/are precipitation reaction(s)? Why is a reaction called precipitation reaction?

Answer 1

i. a. Double displacement reaction
b. Combination reaction
c. Thermal decomposition reaction
ii. Reaction (a) is a precipitation reaction because precipitate of silver chloride is formed as the product. When a product of a chemical reaction is obtained in the form of a precipitate (insoluble substance), then that reaction is called as precipitation reaction.