Knox 2018 Prelim q.15 (1 Viewer)

[jane1820]

is this a module 2 question?
if so how do u do it? i dont get the question

 

[Eagle Mum]

Each solution contains two types of molecules and each solution test reacts with and identifies the presence of a specific molecule.

Iodine reacts with starch to produce a purple colour.
Benedict‘s solution reacts with reducing sugars including glucose, when boiled.
Sucrose is not a reducing sugar, but hydrolyses to fructose and glucose which will then react to the Benedict’s solution.
Protein reacts with biuret solution.

You have starch and sucrose in solution 1 and glucose and protein in solution 2, so you are looking for the selection with solution 1 (with starch) reacting in the iodine test, solution 2 (glucose ) reacting with the Benedict’s test, solution 1 (sucrose) reacting with Benedict’s test after hydrolysis (although I‘d argue that the glucose in solution would still react, so technically none of options are correct, even though I think they are looking for option C) and solution 2 (protein) reacts with biuret solution.