Colour Tests

Question 1

What the test for ammonia:

Answer 1

Turn damp red litmus paper blue

Question 2

What the test for carbon dioxide?

Answer 2

Turns limewater milky

Question 3

What the test for Chlorine?

Answer 3

bleaches damp litmus paper

Question 4

What the test for hydrogen?

Answer 4

lighted splint pops

Question 5

What the test for oxygen?

Answer 5

relights a glowing splint

Question 6

What the test for sulfur dioxide?

Answer 6

Turns acidified potassium manganate (VII) from purple to colourless

SO4 reducing agent used to bleach colored compounds

Question 7

Flame colour for ion:
Lithium, Li+

Answer 7

Red

Question 8

Flame colour for ion:
Na+

Answer 8

Yellow

Question 9

Flame colour for ion:
Potassium, K+

Answer 9

Lilac

Question 10

Flame colour for ion:
Calcium, Ca 2+

Answer 10

Orange-red

Question 11

Flame colour for ion:
Barium, Ba 2+

Answer 11

Light green

Question 12

Flame color for ion:
Copper (II), Cu 2+

Answer 12

Blue-green

Question 13

What is the effect of aqueous sodium hydroxide on cation:
Al 3+

Answer 13

white ppt.
soluble in excess, giving a colourless solution

Question 14

What is the effect of aqueous ammonia on cation:
Al 3+

Answer 14

white ppt.
insoluble in excess

Question 15

What is the effect of aqueous sodium hydroxide on cation:
NH4 +

Answer 15

Ammonia produced on warming