05 May 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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Did you answer the Secondary Chemistry Tuition Question correctly?

 

17.D

18.A

19.C

20.D

 

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