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Tranistion Metal Colours

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A level Chemistry (Transition Metals) Quiz on Tranistion Metal Colours, created by JOshodi on 14/04/2015.
JOshodi
Quiz by JOshodi, updated more than 1 year ago
JOshodi
Created by JOshodi over 11 years ago
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Resource summary

Question 1

Question
What colour are aqueous Fe²⁺ ions? [Fe(H₂O)₆]²⁺
Answer
  • Pale Green
  • Green
  • Blue
  • Brown

Question 2

Question
What colour are aqueous Fe²+ ions in a small amount of OH- [Fe(H₂O)₆]²⁺ + 2OH- → Fe(H₂O)₄(OH)₂ (s) + 2H₂O
Answer
  • Green glatinous precipitate
  • Green precipitate
  • Brown gelatinous precipitate
  • Yellow

Question 3

Question
What colour are aqueous Fe²+ ions in a small amount of NH₃ [Fe(H₂O)₆]²⁺ + 2NH₃ → Fe(H₂O)₄(OH)₂ (s) + 2NH₄⁺
Answer
  • Green Gelatinous precipitate
  • Brown Gelatinous Preciptate
  • Brown
  • Blue Gelatinous

Question 4

Question
What colour are aqueous Fe²+ ions when OH- is added in excess [Fe(H₂O)₆]²⁺ + 2OH- → Fe(H₂O)₄(OH)₂ (s) + 2H₂O
Answer
  • Green Gelatinous Precipitate
  • Yellow Gelatinous Precipitae
  • Purple
  • Brown Gelatinous Precipitate

Question 5

Question
What colour are aqueous Fe²+ ions when NH₃ is added in excess [Fe(H₂O)₆]²⁺ + 2NH₃ → Fe(H₂O)₄(OH)₂ (s) + 2NH₄⁺
Answer
  • Green gelationuos precipitate
  • Brown precipitate
  • Blue Gelatinous Precipitate
  • Yellow Precipitate

Question 6

Question
Why does Fe(H₂O)₄(OH)₂ (s) turn brown in air?
Answer
  • Oxidised by oxygen in air
  • Fe(H₂O)₃(OH)₃ is formed which is Brown
  • It is reduced by air
  • There are impurities

Question 7

Question
What is formed when Fe²⁺ is added to CO₃²⁻ ? And what colour is it?
Answer
  • FeCO₃ Iron Carbonate
  • Green precipitate
  • Green gelatinous precipitate
  • Fe₂(CO₂)₃

Question 8

Question
What colour is aqueous Co²⁺ ? And what is its formula?
Answer
  • [Co(H₂O)₆]²⁺
  • Pink
  • Blue
  • Co(H₂O)₄(OH)₂

Question 9

Question
What colour are aqueous Co²+ ions in a small amount of OH- [Co(H₂O)₆]²⁺ + 2OH- → Co(H₂O)₄(OH)₂ (s) + 2H₂O
Answer
  • Blue Precipitate
  • Pink Precipitae
  • Yellow
  • Green

Question 10

Question
What colour are aqueous Co²+ ions in a small amount of NH₃ [Co(H₂O)₆]²⁺ + 2NH₃ → Co(H₂O)₄(OH)₂ (s) + 2NH₄⁺
Answer
  • Blue Precipitate
  • Orange
  • Pale Blue Precipitate
  • Blue Gelatinous Precipitate

Question 11

Question
What colour are aqueous Co²+ ions when OH- is added in excess? [Co(H₂O)₆]²⁺ + 2OH- → Co(H₂O)₄(OH)₂ (s) + 2H₂O
Answer
  • Blue Precipitate
  • Yellow Precipitate
  • Green Gelatinous Precipitate
  • Blue gelatinous precipitate

Question 12

Question
What colour are aqueous Co²+ ions when NH₃ is added in excess? What is the formula? [Co(H₂O)₆]²⁺ + 2NH₃ →
Answer
  • Co(H₂O)₄(OH)₂
  • Co(NH₃)₆
  • Pale Yellow
  • Blue

Question 13

Question
Why does [Co(NH₃)₆]²⁺ turn to a brown solution in air?
Answer
  • Co²⁺ is oxidied by air to form Co³⁺
  • There are impurities
  • Ligand Exchange takes place

Question 14

Question
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
Answer
  • CoCO₃
  • Pink Precipitate
  • Blue precipitate
  • Co(H₂O)₄(CO₃)₂

Question 15

Question
What colour are aqueous Cu²+ ions [Cu(H₂O)₆]²⁺
Answer
  • Blue
  • Pale Blue
  • Orange
  • Green

Question 16

Question
What colour are aqueous Cu²+ ions in a small amount of OH- [Cu(H₂O)₆]²⁺ + 2OH- → Cu(H₂O)₄(OH)₂ (s) + 2H₂O
Answer
  • Deep Blue precipitate
  • Pale Blue Precipitate
  • Green Precipitate
  • Orange precipitate

Question 17

Question
What colour are aqueous Cu²+ ions OH- are added in excess? [Cu(H₂O)₆]²⁺ + 2OH- → Cu(H₂O)₄(OH)₂ (s) + 2H₂O
Answer
  • Pale blue precipitate
  • Green precipitate
  • Dark Blue solution
  • Pale Blue Solution

Question 18

Question
What colour are aqueous Cu²+ ions in a small amount of NH₃ [Cu(H₂O)₆]²⁺ + 2NH₃ → Cu(H₂O)₄(OH)₂ (s) + 2NH₄⁺
Answer
  • Pale Blue solution
  • Pale Blue precipitate
  • Colourless Solution
  • Yellow precipitate

Question 19

Question
What colour are aqueous Cu²+ when NH₃ is added in excess [Cu(H₂O)₆]²⁺ + 4NH₃ → [Cu(NH₃)₄(H₂O)₂]²⁺ + 4H₂O
Answer
  • Deep Blue Solution
  • Deep Blue Precipitate
  • Pale Blue precipitate
  • Pale Blue solution

Question 20

Question
What colour are aqueous Cu²+ when in the presence of CO₃²⁻ [Cu(H₂O)₆]²⁺ + 2CO₃²⁻ → CuCO₃ (s) + 6H₂O
Answer
  • Blue-Green Solution
  • Blue-Green Precipitate
  • Blue Precipitate
  • Red Precipitate

Question 21

Question
What colour are aqueous Fe³⁺ ?
Answer
  • Purple
  • Yellow
  • Green
  • Blue

Question 22

Question
What colour are aqueous Fe³⁺ ions in a small amount of OH-? [Fe(H₂O)₆]³⁺ + 3OH- → Fe(H₂O)₃(OH)₃ (s) + 3H₂O
Answer
  • Brown Precipitate
  • Brown Gelatinous Precipitate
  • Green Gelatinous Precipitate
  • Green Precipitate

Question 23

Question
What colour are aqueous Fe³⁺ ions when OH- is added in excess? [Fe(H₂O)₆]³⁺ + 3OH- → Fe(H₂O)₃(OH)₃ (s) + 3H₂O
Answer
  • Brown Gelatinous Precipitate
  • Brown Solution
  • Yellow Solution
  • Green Gelatinous Precipitate

Question 24

Question
What colour are aqueous Fe³⁺ ions in a small amount of NH₃ [Fe(H₂O)₆]³⁺ + 3NH₃ → Fe(H₂O)₃(OH)₃ (s) + 3NH₄⁺
Answer
  • Brown Gelatinous Precipitate
  • Green Solution
  • Blue Gelatinous Precipitate
  • Blue Solution

Question 25

Question
What colour are aqueous Fe³⁺ ions when NH₃ is added in excess? [Fe(H₂O)₆]³⁺ + 3NH₃ → Fe(H₂O)₃(OH)₃ (s) + 3NH₄⁺
Answer
  • Green Gelatinous Precipitate
  • Yellow Gelatinous Precipitate
  • Brown Gelatinous Precipitate
  • Yellow Solution

Question 26

Question
What is observed when aqueous Fe³⁺ ions when in the presence of CO₃²⁻? What is formed? [Fe(H₂O)₆]³⁺ + 3CO₃²⁻ →
Answer
  • Fe(H₂O)₃(OH)₃ + CO₂
  • Brown Gelatinous precipitate Effervesence (Bubbles)
  • Fe(H₂O)₄(OH)₂ + CO₂
  • Green Gelatinous Precipitate Effervesence (Bubbles)

Question 27

Question
What colour are aqueous Al³⁺ ions in a small amount of OH- [Al(H₂O)₆]³⁺ + 3OH- → Al(H₂O)₃(OH)₃ (s) + 3H₂O
Answer
  • Colourless
  • White precipitate
  • Yellow precipitate
  • Pink Solution

Question 28

Question
What colour are aqueous Al³⁺ ions [Al(H₂O)₆]³⁺
Answer
  • Colourless solution
  • White precipitate
  • Red Solution
  • Silver solution

Question 29

Question
What colour are aqueous Al³⁺ ions when OH- is added in excess? [Al(H₂O)₆]³⁺ + 4OH- → [Al(OH)₄]⁻ (s) + 6H₂O
Answer
  • Colourless Solution
  • Red precipitate
  • Red solution
  • White Solution

Question 30

Question
What colour are aqueous Al³⁺ ions in a small amount of NH₃ [Al(H₂O)₆]³⁺ + 3NH₃ → Al(H₂O)₃(OH)₃ (s) + 3NH₄⁺
Answer
  • White Precipitate
  • Pale Blue Solution
  • White Solution
  • Orange Precipitate

Question 31

Question
What colour are aqueous Al³⁺ ions when NH₃ is added in excess [Al(H₂O)₆]³⁺ + 3NH₃ → Al(H₂O)₃(OH)₃ (s) + 3NH₄⁺
Answer
  • White solution
  • White Precipitate
  • Pale Blue Solution
  • Blue Precipitate

Question 32

Question
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
Answer
  • Al(⁻H₂O)₃(OH)₃ (s) + CO₂
  • White Precipitate Effervesence (Bubbles)
  • Al(H₂O)₄(OH)₂ + CO₂
  • Colourless Solution Effervesence

Question 33

Question
What colour are aqueous Cr³⁺ ions? [Cr(H₂O)₆]³⁺
Answer
  • Blue
  • Pink
  • Ruby
  • Yellow

Question 34

Question
What colour are aqueous Cr³⁺ ions in a small amount of OH- [Cr(H₂O)₆]³⁺ + 3OH- → Cr(H₂O)₃(OH)₃ (s) + 3H₂O
Answer
  • Red Precipitate
  • Green Precipitate
  • Blue Precipitate
  • Orange Precipitate

Question 35

Question
What colour are aqueous Cr³⁺ when OH- is added in excess? [Cr(H₂O)₆]³⁺ + 6OH- → [Cr(OH)₆]³⁻ (s) + 6H₂O
Answer
  • Green Precipitate
  • Green Solution
  • Red Solution
  • Blue Precipitate

Question 36

Question
What colour are aqueous Cr³⁺ ions in a small amount of NH₃ [Cr(H₂O)₆]³⁺ + 3NH₃ → Cr(H₂O)₃(OH)₃ (s) + 3NH₄⁺
Answer
  • Green Precipitate
  • Green Solution
  • Brown Precipitate
  • Red Solution

Question 37

Question
What colour are aqueous Cr³⁺ ions when NH₃ is added in excess? [Cr(H₂O)₆]³⁺ + 3NH₃ → [Cr(NH₃)₆]³⁺ (s) + 6H₂O
Answer
  • Green Solution
  • Purple Solution
  • Purple Precipitate
  • Green Precipitate

Question 38

Question
What is observed when Cr³⁺ ions are in the presence of CO₃²⁻ ? What is formed? [Cr(H₂O)₆]³⁺ + 3CO₃²⁻ →
Answer
  • Cr(H₂O)₃(OH)₃ (s) + CO₂
  • Green Precipitate Effervesence (Bubbles)
  • Cr(H₂O)₄(OH)₂ (s) + CO₂
  • Green Solution Effervesence (Bubbles)
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