2 Which mixture results in a precipitation reaction?
A-dilute sulfuric acid and potassium hydroxide solution
B-iron and calcium chloride solution
C-chlorine water and potassium bromide solution
D-silver nitrate solution and potassium bromide solution
(Total for Question 2 = 1 mark)
ANSWER
D - silver nitrate solution and potassium bromide solution
Analysis of Option/Explanation
Option A
H2SO4 + 2KOH→K2SO4 + 2H2O, the said reaction is a neutralization reaction which has taken place between an acid and Alkali resulting in formation of Salt and water.
Option B
Fe + CaCl2→No reaction, the reaction doesnot take place as “Fe” is lower in the electrochemical series when compared with “Ca”, hence not able to displace it.
Option C
Cl2 + 2KBr→2KCl + Br2; the said reaction is a neutralization reaction in which the “Cl” displace “K” from its compound resulting in formation of potassium chloride and leaving Bromine alone. This happens because Chlorine is above the potassium in electrochemical series.
Option D)
AgNO3 + KBr→KNO3 + AgBr, the said reaction is a precipitation reaction in which green Ag Br precipitate is formed.
