Question

In exam or in daily life, How to identify that solids are crystalline or amorphous solid??
If we don't know its physical properties i.e. their melting point, their particle arrangement, so on.​

Answer 1

ALL salts of sodium, potassium and ammonium are crystalline and water soluble.

ALL salts of alkali metals are crystalline and water soluble.

ALL nitrate salts are crystalline and water soluble.

Chlorides of ALL metals except lead, silver, mercurous(Hg+) are crystalline and water soluble.

ALL Bicarbonates and Bisulphates are generally crystalline ,soluble in water except for those of transition metals.

ALL Phosphates except for those of sodium, potassium and ammonium are amorphous and insoluble in water.

ONLY Carbonates of alkali metals and ammonium are fully crystalline and water-soluble.

Hydroxides of ALL Alkali metals, calcium, strontium and barium are crystalline.

Sulphates of ALL salts except for lead, mercury, silver, barium, strontium, calcium are crystalline and water soluble.

Sulphides of ALL alkali metals and most alkaline earth metals are crystalline, transition metal sulphides are amorphous.

Acetates of ONLY alkali metals and alkaline earth metals are crystalline.