Appearance Tests

Question 1

Name the four ions that are green

Answer 1

Cr^3+
V^3+
Fe^2+
Ni^2+

Question 2

What are the two yellow metal ions

Answer 2

Chromate (VI) ➡️ CrO4^2-

V(V) ➡️ VO2^+

Question 3

What are the two pink metal ions

Answer 3

Mn^2+

Co^2+

Question 4

What are the two blue metal ions

Answer 4

Cu^2+

V(IV) (VO^2+)

Question 5

What is the violet metal ion

Answer 5

V^2+

Question 6

What are the two orange metal ions

Answer 6

Dichromate (VI) ➡️ Cr2O7^2+

Fe^3+

Question 7

What is the colour change when zinc reduces ammonium vanadate (V) in conc HCl

Answer 7

Yellow ➡️ blue ➡️ green ➡️ violet

Question 8

What are the deductions if the observation is that it is a colourless liquid with a sharp, irritating smell

Answer 8

Possibly a carboxylic acid

Question 9

What are the deductions if the observations are that it is a colourless liquid with spirit/alcohol smell

Answer 9

Possibly an alcohol

Question 10

What are the deductions if the observations are that it has a fruity/sweet/solvent-like smell

Answer 10

Possibly an Ester

Question 11

What would a white crystalline solid indicate

Answer 11

Does not contain transition metal ions

Possibly a compound of group I or II or an ammonium compound

Question 12

What would a blue crystalline solid indicate

Answer 12

Possibly contains copper(II) ions