9701 MCQ Solution 58

Question 58: [Inorganic > Nitrogen and Sulphur]

Which reagent, when mixed and heated with ammonium sulphate, liberates ammonia?

A aqueous bromine

B dilute hydrochloric acid

C limewater

D acidified potassium dichromate(VI)

Reference: Past Exam Paper -June 2003 Paper 1 Q18

Solution 58:

Answer: C.

Test for the ammonium ion is adding a base then warming and then ammonia gas is produced therefore answer is C because limewater is Ca(OH)2 which is a base and when it reacts with an ammonium ion which ammonium sulphate it produces ammonia gas overall reaction is:

Ca(OH)2 + (NH4)2 SO4 = CaSO4 + 2NH3 + 2H2O.