Tests

Question 1

Aldehyde

Answer 1

Tollens = silver mirror ppt

Question 2

C=C bond

Answer 2

Bromine water = orange to colourless (decolourisation)

Question 3

Halide ions

Answer 3

Silver nitrate in presence of dilute nitric acid

Chlorine = white ppt
Bromine = cream ppt 
Iodine = yellow ppt

Question 4

Carboxylic acid

Answer 4

Sodium carbonate/hydrogencarbonate = CO2 bubbles

Question 5

C=O bond

Answer 5

2,4-DNPH = orange-red ppt

Question 6

Hydrogen + burning splint

Answer 6

Squeaky pop

When burning splint is held at open end of test tube

Question 7

Oxygen + glowing splint

Answer 7

Relights

Question 8

Carbon dioxide

Answer 8

Limewater turns cloudy when shaken with C02

Question 9

Chlorine

Answer 9

Damp blue litmus paper turns red and then is bleached (paper turns white)

Question 10

Carbonate ion

Answer 10

Dilute acid

Question 11

Sulfate ion

Answer 11

Aqueous solution of BaCl2 (barium chloride) in the presence of dilute hydrochloric acid

Question 12

Tests for metal cations using NaOH (aq)

Al3+, Ca2+, Mg2+
Cu2+
Fe2+
Fe3+

Answer 12

Al3+, Ca2+, Mg2+ = white ppt
Cu2+ = blue ppt
Fe2+ = green ppt
Fe3+ = brown ppt

Question 13

Flame tests
Li
Na
K
Ca
Cu

Answer 13

Li = crimson red
Na = yellow-orange
K = lilac
Ca = red-orange
Cu = green

Question 14

Water

Answer 14

Anhydrous copper (II) sulfate
White to blue colour change