How could you distinguish between salts of aluminium and zinc ?

Using Raoult's law how could you distinguish between ideal and non-ideal solutions ?

How will you distinguish between a note and its echo?

How would you distinguish between oxalic acid and glucose by one chemical test.

How can you distinguish between an alcohol and an acid?

How will you distinguish between urea and glycine ?

You are given a hammer, a battery, a bulb, wires and a switch. (a) How could you use them to distinguish between samples of metals and non-metals? (b) Assess the usefulness of these tests in distinguishing between metals and non – metals.