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Solutions question

2002 · Q96
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Solutions question

2002 · Q96

NEETChemistrySolutionsMCQ+4 / −1
A solution contains non volatile solute of molecular mass M2. Which of the following can be used to calculate the molecular mass of solute in terms of osmotic pressure?
  1. A
    M2=(m2π)VRT{M_2} = \left( {{{{m_2}} \over \pi }} \right)VRTM2​=(πm2​​)VRT
  2. B
    M2=(m2V)RTπ{M_2} = \left( {{{{m_2}} \over V}} \right){{RT} \over \pi }M2​=(Vm2​​)πRT​
  3. C
    M2=(m2V)πRT{M_2} = \left( {{{{m_2}} \over V}} \right)\pi RTM2​=(Vm2​​)πRT
  4. D
    M2=(m2V)πRT{M_2} = \left( {{{{m_2}} \over V}} \right){\pi \over {RT}}M2​=(Vm2​​)RTπ​
View written solutionFree

Correct answer: B

For dilute solution, the van’t Hoff equation is

π=nVRT\pi = {n \over V}RTπ=Vn​RT

⇒\Rightarrow⇒ πV=nRT\pi V = nRTπV=nRT

⇒\Rightarrow⇒ πV=m2MRT\pi V = {{{m_2}} \over M}RTπV=Mm2​​RT

⇒\Rightarrow⇒ M2=(m2V)RTπ{M_2} = \left( {{{{m_2}} \over V}} \right){{RT} \over \pi }M2​=(Vm2​​)πRT​

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