O Level

05 May O Level

IP Chemistry Tuition Question

17        Acidified potassium dichromate(VI) can be used to detect the presence of ethanol vapour in the breath of a person who has consumed an ethanol-containing drink.


A colour change from orange to green is observed if ethanol is present.

This shows that ethanol is


A          an alkali.

B          an indicator.

C          an oxidising agent.

D          a reducing agent.



18        Which substance does not produce copper(II) sulfate when added to dilute sulphuric acid?


A copper

B copper(II) carbonate

C copper(II) hydroxide

D copper(II) oxide



19        The positions of four elements are shown on the outline of part of the Periodic Table.


Element X has a high melting point and is a good conductor of electricity.

It forms chlorides XCl2 and XCl3.



Which element is X?


20        In which compound does the element X have the highest oxidation state?


A          X2O                                          B          X4O

C          XO2                                          D          XO4




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