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Question

A solution of glucose (C8H12O6) is isotonic with 5g of urea (NH2CONH2) per litre of solution. The concentration of glucose is:

A
4 g/L
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B
8 g/L
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C
12 g/L
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D
15 g/L
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Solution

The correct option is B 15 g/L
Isotonic solution means solution of same concentration i.e., Molarity of glucose = Molarity of urea

Molarity of urea =560×1=112 M

Molarity of glucose =112 M

Concentration of glucose in gL=180×112=15 g/L

Hence, the correct option is D.

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