Effect of Heat On Salts

Question 1

Heat on Carbonate Salts (Except Na & K)

Answer 1

decomposes to produce :
i) Carbon Dioxide
ii) Metal Oxide

Gas Released turns limewater cloudy

Question 2

Heat on Nitrate Salts (except Na & K)

Answer 2

decomposes to produce
i) Nitrogen Dioxide Gas
ii) Oxygen Gas
iii) Metal Oxide

Gas produced is brown and acidic
Gas prouced reignites glowing wooden splinter

Question 3

Heat on NH4Cl

Answer 3

decomposes to produce
i Ammonia Gas
ii Hydrogen Chloride Gas

Gas produced is pungent and alkaline

Question 4

Heat on ZnSO4

Answer 4

decomposes to produce
i) Zinc Oxide
ii) Sulphur Trioxide Gas

Question 5

Heat on FeSO4

Answer 5

decomposes to produce
i) Sulphur dioxide gas
ii) Sulphur Trioxide Gas
ii) Iron (iii) Oxide

Question 6

Colour of salt residue after heat that contain Cu2+ ion

Answer 6

Black

Question 7

Colour of salt residue after heat that contain Fe3+ ion

Answer 7

Brown

Question 8

Colour of salt residue after heat that contain Zn2+ ion when cool

Answer 8

White

Question 9

Colour of salt residue after heat that contain Zn2+ ion when hot

Answer 9

Yellow

Question 10

Colour of salt residue after heat that contain Pb2+ ion when hot

Answer 10

Brown

Question 11

Colour of salt residue after heat that contain Pb2+ ion when cool

Answer 11

yellow