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The correct answer is A . MIlk is a mixture because pure substances were combined together without formation of bonds, hence it would be easy to separate the substances. On the other hand, salt, sulfuric acid and carbon-dioxide are made from bonding between elements in the periodic table to form compounds. Salt is formed through bonding between Na and Cl atoms, while sulfuric acid is made from bonding
and
ions. Carbon-dioxide
is made from bonding between C and O elements. Compounds bond at a specific ratio while mixtures have no specific ratio of mixing.
Answer:
Due to hydrogen bond in propylamine.
Explanation:
The boiling point or melting point are property of
a) size
b) the intermolecular force of interactions.
As we know that primary and secondary amines form intermoleclar hydrogen bonds, which increases the force of attractions between molecules increasing the boiling point of amines.
However in case of tertiary amines there is no hydrogen directly attached to electronegative nitrogen atoms, thus no possibility of formation of hydrogen bond hence low boiling points.
The structures are shown in the figure.
