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Question

Calculate the osmotic pressure of a decinormal solution of $$NaCl$$ which is ionised to $$80\%$$ at $${ 27 }^{ o }C$$?


A
4.43 atm
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B
0.443 atm
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C
0.222 atm
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D
0.111 atm
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Solution

The correct option is A $$4.43$$ atm
We have
$$\pi = iCRT$$

and $$i = 1 + (n-1)\alpha$$
where,
$$n=2,$$ $$\alpha = 0.8$$

$$i = 1 + (2-1)0.8 = 1.8$$

On putting the values, we have

$$\pi = 1.8\times 0.1\times 0.082\times 300$$

$$\pi = 4.43\ atm$$

Option A is correct.

Chemistry

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