Question:-
Criteria for purity of organic solid is
(a) boiling point
(b) melting point
(c) specific gravity
(d) none of these
Answer:-
(b) melting point
Step-by-step explanation:-
Melting point is considered to be the best measure of purity of a substance.
When a purified sample is mixed with a small amount of pure compound , melting point of the mixture is determined.
If a substance is impure (contains impurities/other substance) the melting point of that substance will change.
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The purity percentage of a substance can be calculated by dividing the mass of the pure chemical by the total mass of the sample and multiplying this number by 100.
[Mass of pure chemical/total mass × 100]