Classify the following substances into compounds and mixtures :
Carbon dioxide, air, water, milk, common salt, blood, fruit juice, iron sulphide.
Classify the following into elements and compounds:
Water, Hydrogen, Salt, Gold, Carbon dioxide, Iron
Classify the following into elements, compounds and mixtures:
(a) Sodium
(b) Soil
(c) Sugar solution
(d) Silver
(e) Calcium carbonate
(f) Tin
(g) Silicon
(h) Coal
(i) Air
(j) Soap
(k) Methane
(l) Carbon dioxide
(m) Blood