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Question

A solution of glucose (C6H12O6) is isotonic with 4 g of urea (H2NCONH2) per litre of solution. The concentration of glucose is:

A
4 g/L
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B
3 g/L
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C
12 g/L
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D
14 g/L
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Solution

The correct option is C 12 g/L
Isotonic solutions are those that have the same osmotic pressure.
Osmotic pressure, π=CRT
So here, both the solutions should have the same concentration.
Let, x gm of glucose present in 1 litre solution.
So, according to the question,
x180=460
x=12 g/L

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