Anions ( Direct )

Question 1

Test For sulfates

Answer 1

Add barium chloride or barium nitrate solution followed by dilute Hcl

Question 2

Result

Answer 2

White precipitate of barium sulfate is formed which is insoluble in dilute Hcl

Question 3

Test For sulfites

Answer 3

Add BaCl2 of Ba(No3)2 solution followed by dilute Hcl

Question 4

Result

Answer 4

White precipitate insoluble in Hcl

Question 5

Test For nitrate

Answer 5

Add NaOH solution and a piece of aluminium foil. Warm gently

Question 6

Result

Answer 6

Effervescence. Pungent smelling gas evolves which turns damp red litmus paper blue

Question 7

Test For nitrite

Answer 7

Decolorises acudified potassium manganate 7. Hence it is a reducing agent

Question 8

Gas test For:
1. Hydrogen
2. Oxygen
3. Carbon dioxide
4. Sulfur dioxide
Ammonia gas NH3

Answer 8

1. Burns with a pop sound
2. Rekindles a glowing splint
3. Turns time water milky
4. Decolourises acidified potassium manganate 7 from purple to colourless( reducing agent )

Question 9

Flame test For:
1. Magnesium
2. Sodium
3. Lithium
4. Potassium
5. Barium
6. Calcium
7. Copper ions

Answer 9

1. Dazzling white flame
2. Yellow flame
3. Bright red flame
4. Lilac flame
5. Grassy green flame
6. Crimson flame (orange-red)
7. Bluish green flame

Question 10

What happens to copper when heated

Answer 10

Turns black

Question 11

Test For chlorine

Answer 11

Bleaches damp litmus paper

Question 12

What happens when zinc is heated

Answer 12

Yellow when hot white when cold

Question 13

When ammonium salts react with an _______ in the presence of heat, Ammonia gas is liberated

Answer 13

Alkali