Older MCQs might not have the typical A, B, C,
D
choices. They
have choices 1, 2, 3, and a combination of them is the answer. Below is the key that maps such
combinations to the answer.
A
1, 2 and 3 are correct
B
1 and 2 only are correct
C
2 and 3 only are correct
D
1 only is correct
Describe tests to identify the anions: (a) carbonate, ( CO_3^{2-} ), by reaction with dilute acid and then testing for carbon dioxide gas (b) chloride, ( Cl^- ), bromide, ( Br^- ), and iodide, ( I^- ), by acidifying with dilute nitric acid then adding aqueous silver nitrate (c) nitrate, ( NO_3^- ), reduction with aluminium foil and aqueous sodium hydroxide and then testing for ammonia gas (d) sulfate, ( SO_4^{2-} ), by acidifying with dilute nitric acid and then adding aqueous barium nitrate (e) sulfite, ( SO_3^{2-} ), by reaction with acidified aqueous potassium manganate(VII)
Identify the products formed at the electrodes and describe the observations made during the electrolysis of: (a) molten lead(II) bromide (b) concentrated aqueous sodium chloride (c) dilute sulfuric acid using inert electrodes made of platinum or carbon/graphite
Describe the neutralisation reaction between an acid and an alkali to produce water, ( H^+(aq) + OH^- (aq)
ightarrow H_2O (l) )
