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Question

Identify the compound amongst the following of which 0.1 M aqueous solution has highest boiling point.

A
Glucose
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B
Sodium chloride
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C
Calcium chloride
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D
Ferric chloride
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Solution

The correct option is D Ferric chloride
0.1 M aqueous solution of ferric chloride has the highest boiling point.
The dissociation of one molecule of ferric chloride gives the maximum number of ions (four ions) in the solution.
FeCl3Fe3++3Cl
Glucose is a non-electrolyte and it does not undergo dissociation.
The dissociation of one molecule of sodium chloride gives two ions.
The dissociation of one molecule of calcium chloride gives three ions.
Note: The solution which gives the highest number of ions on dissociation will have the highest boiling point.

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