Module 3 (paper 1 & 3)

Question 1

Cl2

Answer 1

Pale green in water
Pale green in organic solvent

Question 2

Br2

Answer 2

Orange in water
Orange in organic solvent

Question 3

I2

Answer 3

Brown in water
Violet in organic solvent

Question 4

Cl- ion

Answer 4

Silver halide is white precipitate
Soluble in dilute NH3

Question 5

Br-

Answer 5

Silver halide is a cream precipitate
Soluble in concentrated NH3

Question 6

I-

Answer 6

Silver halide is a yellow precipitate
Insoluble in concentrated NH3

Question 7

Test for CO3 2-

Answer 7

Add dilute HNO3
Fizzing , CO2

Question 8

Test for SO4 2-

Answer 8

Add Ba(NO3)2
Insoluble white precipitate (BaSO4)

Question 9

Test for NH4 +

Answer 9

Add NaOH(aq) then heat
NH3(g), litmus paper turns blue