9701 MCQ Solution 58

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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.

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