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A level Chemistry (Transition Metals) Quiz on Tranistion Metal Colours, created by JOshodi on 14/04/2015.

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Tranistion Metal Colours

Question 1 of 38

1

What colour are aqueous Fe²⁺ ions?
[Fe(H₂O)₆]²⁺

Select one of the following:

  • Pale Green

  • Green

  • Blue

  • Brown

Explanation

Question 2 of 38

1

What colour are aqueous Fe²+ ions in a small amount of OH-
[Fe(H₂O)₆]²⁺ + 2OH- → Fe(H₂O)₄(OH)₂ (s) + 2H₂O

Select one of the following:

  • Green glatinous precipitate

  • Green precipitate

  • Brown gelatinous precipitate

  • Yellow

Explanation

Question 3 of 38

1

What colour are aqueous Fe²+ ions in a small amount of NH₃
[Fe(H₂O)₆]²⁺ + 2NH₃ → Fe(H₂O)₄(OH)₂ (s) + 2NH₄⁺

Select one of the following:

  • Green Gelatinous precipitate

  • Brown Gelatinous Preciptate

  • Brown

  • Blue Gelatinous

Explanation

Question 4 of 38

1

What colour are aqueous Fe²+ ions when OH- is added in excess
[Fe(H₂O)₆]²⁺ + 2OH- → Fe(H₂O)₄(OH)₂ (s) + 2H₂O

Select one of the following:

  • Green Gelatinous Precipitate

  • Yellow Gelatinous Precipitae

  • Purple

  • Brown Gelatinous Precipitate

Explanation

Question 5 of 38

1

What colour are aqueous Fe²+ ions when NH₃ is added in excess
[Fe(H₂O)₆]²⁺ + 2NH₃ → Fe(H₂O)₄(OH)₂ (s) + 2NH₄⁺

Select one of the following:

  • Green gelationuos precipitate

  • Brown precipitate

  • Blue Gelatinous Precipitate

  • Yellow Precipitate

Explanation

Question 6 of 38

1

Why does Fe(H₂O)₄(OH)₂ (s) turn brown in air?

Select one or more of the following:

  • Oxidised by oxygen in air

  • Fe(H₂O)₃(OH)₃ is formed which is Brown

  • It is reduced by air

  • There are impurities

Explanation

Question 7 of 38

1

What is formed when Fe²⁺ is added to CO₃²⁻ ? And what colour is it?

Select one or more of the following:

  • FeCO₃ Iron Carbonate

  • Green precipitate

  • Green gelatinous precipitate

  • Fe₂(CO₂)₃

Explanation

Question 8 of 38

1

What colour is aqueous Co²⁺ ? And what is its formula?

Select one or more of the following:

  • [Co(H₂O)₆]²⁺

  • Pink

  • Blue

  • Co(H₂O)₄(OH)₂

Explanation

Question 9 of 38

1

What colour are aqueous Co²+ ions in a small amount of OH-
[Co(H₂O)₆]²⁺ + 2OH- → Co(H₂O)₄(OH)₂ (s) + 2H₂O

Select one of the following:

  • Blue Precipitate

  • Pink Precipitae

  • Yellow

  • Green

Explanation

Question 10 of 38

1

What colour are aqueous Co²+ ions in a small amount of NH₃
[Co(H₂O)₆]²⁺ + 2NH₃ → Co(H₂O)₄(OH)₂ (s) + 2NH₄⁺

Select one of the following:

  • Blue Precipitate

  • Orange

  • Pale Blue Precipitate

  • Blue Gelatinous Precipitate

Explanation

Question 11 of 38

1

What colour are aqueous Co²+ ions when OH- is added in excess?
[Co(H₂O)₆]²⁺ + 2OH- → Co(H₂O)₄(OH)₂ (s) + 2H₂O

Select one of the following:

  • Blue Precipitate

  • Yellow Precipitate

  • Green Gelatinous Precipitate

  • Blue gelatinous precipitate

Explanation

Question 12 of 38

1

What colour are aqueous Co²+ ions when NH₃ is added in excess? What is the formula?
[Co(H₂O)₆]²⁺ + 2NH₃ →

Select one or more of the following:

  • Co(H₂O)₄(OH)₂

  • Co(NH₃)₆

  • Pale Yellow

  • Blue

Explanation

Question 13 of 38

1

Why does [Co(NH₃)₆]²⁺ turn to a brown solution in air?

Select one or more of the following:

  • Co²⁺ is oxidied by air to form Co³⁺

  • There are impurities

  • Ligand Exchange takes place

Explanation

Question 14 of 38

1

What is fromed when Co²+ ions are in the presence of CO₃²⁻ ? And what colour is it?
[Co(H₂O)₆]²⁺ + CO₃²⁻ →

t is formed

[Co(H₂O)₆]²⁺ + OH- → Co(H₂O)₄(OH)₂ (s) + 2H₂O

Select one or more of the following:

  • CoCO₃

  • Pink Precipitate

  • Blue precipitate

  • Co(H₂O)₄(CO₃)₂

Explanation

Question 15 of 38

1

What colour are aqueous Cu²+ ions
[Cu(H₂O)₆]²⁺

Select one or more of the following:

  • Blue

  • Pale Blue

  • Orange

  • Green

Explanation

Question 16 of 38

1

What colour are aqueous Cu²+ ions in a small amount of OH-
[Cu(H₂O)₆]²⁺ + 2OH- → Cu(H₂O)₄(OH)₂ (s) + 2H₂O

Select one of the following:

  • Deep Blue precipitate

  • Pale Blue Precipitate

  • Green Precipitate

  • Orange precipitate

Explanation

Question 17 of 38

1

What colour are aqueous Cu²+ ions OH- are added in excess?
[Cu(H₂O)₆]²⁺ + 2OH- → Cu(H₂O)₄(OH)₂ (s) + 2H₂O

Select one of the following:

  • Pale blue precipitate

  • Green precipitate

  • Dark Blue solution

  • Pale Blue Solution

Explanation

Question 18 of 38

1

What colour are aqueous Cu²+ ions in a small amount of NH₃
[Cu(H₂O)₆]²⁺ + 2NH₃ → Cu(H₂O)₄(OH)₂ (s) + 2NH₄⁺

Select one of the following:

  • Pale Blue solution

  • Pale Blue precipitate

  • Colourless Solution

  • Yellow precipitate

Explanation

Question 19 of 38

1

What colour are aqueous Cu²+ when NH₃ is added in excess
[Cu(H₂O)₆]²⁺ + 4NH₃ → [Cu(NH₃)₄(H₂O)₂]²⁺ + 4H₂O

Select one of the following:

  • Deep Blue Solution

  • Deep Blue Precipitate

  • Pale Blue precipitate

  • Pale Blue solution

Explanation

Question 20 of 38

1

What colour are aqueous Cu²+ when in the presence of CO₃²⁻
[Cu(H₂O)₆]²⁺ + 2CO₃²⁻ → CuCO₃ (s) + 6H₂O

Select one of the following:

  • Blue-Green Solution

  • Blue-Green Precipitate

  • Blue Precipitate

  • Red Precipitate

Explanation

Question 21 of 38

1

What colour are aqueous Fe³⁺ ?

Select one of the following:

  • Purple

  • Yellow

  • Green

  • Blue

Explanation

Question 22 of 38

1

What colour are aqueous Fe³⁺ ions in a small amount of OH-?
[Fe(H₂O)₆]³⁺ + 3OH- → Fe(H₂O)₃(OH)₃ (s) + 3H₂O

Select one of the following:

  • Brown Precipitate

  • Brown Gelatinous Precipitate

  • Green Gelatinous Precipitate

  • Green Precipitate

Explanation

Question 23 of 38

1

What colour are aqueous Fe³⁺ ions when OH- is added in excess?
[Fe(H₂O)₆]³⁺ + 3OH- → Fe(H₂O)₃(OH)₃ (s) + 3H₂O

Select one of the following:

  • Brown Gelatinous Precipitate

  • Brown Solution

  • Yellow Solution

  • Green Gelatinous Precipitate

Explanation

Question 24 of 38

1

What colour are aqueous Fe³⁺ ions in a small amount of NH₃
[Fe(H₂O)₆]³⁺ + 3NH₃ → Fe(H₂O)₃(OH)₃ (s) + 3NH₄⁺

Select one of the following:

  • Brown Gelatinous Precipitate

  • Green Solution

  • Blue Gelatinous Precipitate

  • Blue Solution

Explanation

Question 25 of 38

1

What colour are aqueous Fe³⁺ ions when NH₃ is added in excess?
[Fe(H₂O)₆]³⁺ + 3NH₃ → Fe(H₂O)₃(OH)₃ (s) + 3NH₄⁺

Select one of the following:

  • Green Gelatinous Precipitate

  • Yellow Gelatinous Precipitate

  • Brown Gelatinous Precipitate

  • Yellow Solution

Explanation

Question 26 of 38

1

What is observed when aqueous Fe³⁺ ions when in the presence of CO₃²⁻? What is formed?
[Fe(H₂O)₆]³⁺ + 3CO₃²⁻ →

Select one or more of the following:

  • Fe(H₂O)₃(OH)₃ + CO₂

  • Brown Gelatinous precipitate
    Effervesence (Bubbles)

  • Fe(H₂O)₄(OH)₂ + CO₂

  • Green Gelatinous Precipitate
    Effervesence (Bubbles)

Explanation

Question 27 of 38

1

What colour are aqueous Al³⁺ ions in a small amount of OH-
[Al(H₂O)₆]³⁺ + 3OH- → Al(H₂O)₃(OH)₃ (s) + 3H₂O

Select one of the following:

  • Colourless

  • White precipitate

  • Yellow precipitate

  • Pink Solution

Explanation

Question 28 of 38

1

What colour are aqueous Al³⁺ ions
[Al(H₂O)₆]³⁺

Select one of the following:

  • Colourless solution

  • White precipitate

  • Red Solution

  • Silver solution

Explanation

Question 29 of 38

1

What colour are aqueous Al³⁺ ions when OH- is added in excess?
[Al(H₂O)₆]³⁺ + 4OH- → [Al(OH)₄]⁻ (s) + 6H₂O

Select one of the following:

  • Colourless Solution

  • Red precipitate

  • Red solution

  • White Solution

Explanation

Question 30 of 38

1

What colour are aqueous Al³⁺ ions in a small amount of NH₃
[Al(H₂O)₆]³⁺ + 3NH₃ → Al(H₂O)₃(OH)₃ (s) + 3NH₄⁺

Select one of the following:

  • White Precipitate

  • Pale Blue Solution

  • White Solution

  • Orange Precipitate

Explanation

Question 31 of 38

1

What colour are aqueous Al³⁺ ions when NH₃ is added in excess
[Al(H₂O)₆]³⁺ + 3NH₃ → Al(H₂O)₃(OH)₃ (s) + 3NH₄⁺

Select one of the following:

  • White solution

  • White Precipitate

  • Pale Blue Solution

  • Blue Precipitate

Explanation

Question 32 of 38

1

What is observed when Al³⁺ are in the presence of CO₃²⁻ ? What is produced?
[Al(H₂O)₆]³⁺ + CO₃²⁻ → Al(⁻H₂O)₃(OH)₃ (s) + 3H₂O

Select one or more of the following:

  • Al(⁻H₂O)₃(OH)₃ (s) + CO₂

  • White Precipitate
    Effervesence (Bubbles)

  • Al(H₂O)₄(OH)₂ + CO₂

  • Colourless Solution
    Effervesence

Explanation

Question 33 of 38

1

What colour are aqueous Cr³⁺ ions?
[Cr(H₂O)₆]³⁺

Select one of the following:

  • Blue

  • Pink

  • Ruby

  • Yellow

Explanation

Question 34 of 38

1

What colour are aqueous Cr³⁺ ions in a small amount of OH-
[Cr(H₂O)₆]³⁺ + 3OH- → Cr(H₂O)₃(OH)₃ (s) + 3H₂O

Select one of the following:

  • Red Precipitate

  • Green Precipitate

  • Blue Precipitate

  • Orange Precipitate

Explanation

Question 35 of 38

1

What colour are aqueous Cr³⁺ when OH- is added in excess?
[Cr(H₂O)₆]³⁺ + 6OH- → [Cr(OH)₆]³⁻ (s) + 6H₂O

Select one of the following:

  • Green Precipitate

  • Green Solution

  • Red Solution

  • Blue Precipitate

Explanation

Question 36 of 38

1

What colour are aqueous Cr³⁺ ions in a small amount of NH₃
[Cr(H₂O)₆]³⁺ + 3NH₃ → Cr(H₂O)₃(OH)₃ (s) + 3NH₄⁺

Select one of the following:

  • Green Precipitate

  • Green Solution

  • Brown Precipitate

  • Red Solution

Explanation

Question 37 of 38

1

What colour are aqueous Cr³⁺ ions when NH₃ is added in excess?
[Cr(H₂O)₆]³⁺ + 3NH₃ → [Cr(NH₃)₆]³⁺ (s) + 6H₂O

Select one of the following:

  • Green Solution

  • Purple Solution

  • Purple Precipitate

  • Green Precipitate

Explanation

Question 38 of 38

1

What is observed when Cr³⁺ ions are in the presence of CO₃²⁻ ? What is formed?
[Cr(H₂O)₆]³⁺ + 3CO₃²⁻ →

Select one or more of the following:

  • Cr(H₂O)₃(OH)₃ (s) + CO₂

  • Green Precipitate
    Effervesence (Bubbles)

  • Cr(H₂O)₄(OH)₂ (s) + CO₂

  • Green Solution
    Effervesence (Bubbles)

Explanation

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