Question

Classify the following reactions as combination, decomposition, displacement or double displacement reaction and justify your answer.
a. 2KNO3 (s) → 2KNO2 (s) + O2 (g)
b. Zn(s) + 2 AgNO3 (aq) → Zn(NO3)2(aq) +2Ag(s)
c. 2Mg(s) + O2(g) → 2MgO (s)
d. 2KBr(aq) + 2BaI2(aq) → 2KI (aq)+BaBr2 (aq)

Answer 1

Answer:

a) decomposition

b) single displacement

c) combination

d) double displacement

Answer 2

a)Decomposition reaction: Here, potassium nitrate decomposes to form potassium nitrite and oxygen.

b)Single Displacement reaction: Here, Zinc displaces Silver from silver nitrate solution.

c)Combination Reaction: Here, Magnesium and oxygen combine to form Magnesium oxide.

d)Double displacement reaction: During this reaction, the cations and anions of two different compounds switch places, forming two entirely different compounds.