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Question

Solution A contains 7g/L MgCl2 and solution b contains 7g/L of NaCl. At room temperature, the osmotic pressure of:

A
solution A is greater than B
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B
both have same osmotic pressure
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C
solution B is greater than A
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D
cannot be determined
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Solution

The correct option is C solution A is greater than B
MgCl2Mg2++2Cli.e.1+2=3 particles
NaClNa++Cli.e.1+1=2 particles
Osmotic pressure is a colligative property which depends upon the number of particles. The number of particles in MgCl2 being more than that in NaCl, MgCl2 solution will have higher osmotic pressure.

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