Question 1

Copper(II) ions form an aqueous complex ion, X, with chloride ions.

Which statement about X is true?

  A  

X has optical isomers 

  B  

X has a square planar shape


  C  

X has the formula CuCl42+

  D  

X has a yellow colour

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Question 2

Which of the following reagents would enable you to separate iron(III) hydroxide from a mixture of iron(III) hydroxide and copper(II) hydroxide?

  A  

dilute hydrochloric acid

  B  

aqueous ammonia

  C  

dilute nitric acid

  D  

sodium hydroxide solution

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Question 3

The compound 1,2-diaminoethane, H2NCH2CH2NH2, is a bidentate ligand; in formulae, it is usually abbreviated to ‘en’.

When 1,2-diaminoethane is added to [Co(NH3)6]2+ in aqueous solution, [Co(en)3]2+ is formed.

What is the best explanation for this?

  A  

there are much stronger bonds between the ligands and the cobalt(II) ion in [Co(en)3]2+ than in [Co(NH3)6]2+

  B  

when [Co(en)3]2+ is formed from [Co(NH3)6]2+ the reaction is exothermic

  C  

when [Co(en)3]2+ is formed from [Co(NH3)6]2+ the total entropy change is positive

  D  

when [Co(en)3]2+ is formed from [Co(NH3)6]2+ the reaction has a low activation energy

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Question 4

The reaction:

[Fe(H2O)6]2+ + H2O ➔ [Fe(H2O)5(OH)]+ + H3O+

is an example of

  A  

oxidation

  B  

reduction

  C  

ligand exchange

  D  

acid-base behaviour

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Question 5

Hydrated crystals of a compound have the formula CrCl3(H2O)6.

A solution containing one mole of the compound reacts with two moles of silver nitrate to form two moles of silver chloride.

The complex chromium ion in the compound is most likely to be

  A  

[Cr(H2O)3Cl3]3+


  B  

[Cr(H2O)4Cl2]+


  C  

[Cr(H2O)5Cl]2+

  D  

[Cr(H2O)6]3+


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Question 6

Which of the following is a correct statement about the test for Fe2+ ions in solution?

  A  

add NaOH(aq); brown precipitate formed, soluble in NH3(aq)

  B  

add NaOH(aq); brown precipitate formed, insoluble in NH3(aq)

  C  

add NaOH(aq); green precipitate formed, soluble in NH3(aq)

  D  

add NaOH(aq); green precipitate formed, insoluble in NH3(aq)

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Question 7

What is the final species produced when an excess of aqueous ammonia is added to aqueous aluminium chloride?

  A  

[Al(NH3)6]3+


  B  

[Al(OH)3(H2O)3]

  C  

[Al(OH)4(H2O)2]-

  D  

[Al(OH)(H2O)5]2+

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Question 8

What is observed when concentrated hydrochloric acid is added to an aqueous solution of CuSO4 until no further change occurs?

  A  

a colourless gas is evolved and a precipitate forms

  B  

a colourless gas is evolved and no precipitate forms

  C  

a precipitate forms that dissolves in an excess of concentrated hydrochloric acid

  D  

the solution changes colour and no precipitate forms

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