Why is pure acetic acid often called glacial acetic acid?
(a) because it freezes just below 0°c, forming white crystals.
(b) because it freezes just below 100°c, forming white crystals.
(c) because it freezes just below room temperature, forming white crystals.
(d) because it freezes just above room temperature, forming white crystals.

The correct option is: (C) Because it freezes just below room temperature, forming white crystals

Explanation:

Acetic acid or ethanoic acid, is colorless liquid with a characteristic pungent smell and sour taste.  

In the pure form, acetic acid is known as glacial acetic acid. This is because it forms white crystals at 16.6 °C, i.e. just below the room temperature.

Since, glacial acetic acid is free of water molecules, it is also known as anhydrous acetic acid.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

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