Transition elements

Question 1

What colour is [Cu(H₂O)₆]²⁺?

Answer 1

Pale blue 🟦

Question 2

What colour is Cu(OH)₂(s)?

Answer 2

Blue precipitate 🟦

Question 3

What colour is [Cu(NH₃)₄(H₂O)₂]²⁺?

Answer 3

Dark blue 🟦

Question 4

What colour is CuCl₄²⁻?

Answer 4

Yellow 🟡

Question 5

What is observed when Cu²⁺ is reduced with I⁻?

Answer 5

White precipitate (CuI) 🤍and brown solution (Iodine) 🟤

Question 6

What is observed in the disproportionation of Cu⁺?

Answer 6

Brown solid and blue solution 🟤🟦

Question 7

What colour is CoCl₄²⁻?

Answer 7

Blue 🟦

Question 8

What colour is [Cr(H₂O)₆]³⁺?

Answer 8

Pale purple🟣

Question 9

What colour is Cr(OH)₃(s)?

Answer 9

Dark green precipitate 🟢

Question 10

What colour is [Cr(NH₃)₆]³⁺?

Answer 10

Purple 🟣

Question 11

What colour is [Cr(OH)₆]³⁻?

Answer 11

Dark green 🟢

Question 12

What colour is Cr₂O₇²⁻?

Answer 12

Orange 🟠

Question 13

What colour is CrO₄²⁻?

Answer 13

Yellow 🟡

Question 14

What colour is [Mn(H₂O)₆]²⁺?

Answer 14

Pale pink 🩷

Question 15

What colour is Mn(OH)₂(s)?

Answer 15

Pale brown precipitate 🟤

Question 16

What colour is MnO₄⁻?

Answer 16

Purple 🟣

Question 17

What colour is Mn²⁺ in titrations?

Answer 17

Colourless ⚪

Question 18

What colour is Fe(OH)₂(s)?

Answer 18

Dark green precipitate 🟢

Question 19

What colour is [Fe(H₂O)₆]²⁺?

Answer 19

Pale green 🟩

Question 20

What colour is [Fe(H₂O)₆]³⁺?

Answer 20

Yellow 🟡

Question 21

What colour is Fe(OH)₃(s)?

Answer 21

Orange-brown precipitate 🟠

Question 22

What colour change is seen when Fe³⁺ is reduced to Fe²⁺? (with Iodine)

Answer 22

Orange-brown (Fe³⁺) to brown (Iodine) 🟠➡️🟤