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A solution has a 1 : 4 mole ratio of pen...

A solution has a 1 : 4 mole ratio of pentane to hexane. The vapour pressures of pure hydrocarbons at `20^@C` are 440 mm Hg for pentane and 120 mm Hg for hexane. The mole fraction of pentane in vapour phase woule be

A

0.786

B

0.478

C

0.549

D

`0.200`

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The correct Answer is:
B
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AAKASH SERIES-SOLUTIONS -Objective Exercise -3 (PREVIOUS NEEET/AIPMT )
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  2. A solution of urea (molar mass 56) boils at 100.18^@C at atmospheric p...

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  3. During osmosis, net flow of water through a semipermeable membrane is

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  4. The vapour pressure of two liquids P and Q are 80 torr and 60 torr res...

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  5. A solution containing 10 g per "dm"^3 of urea (molar mass = 60) is iso...

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  6. 1.0 g of a non-electrolyte solute (molar mass 250 g "mol"^(-1)) was di...

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  7. A 0.5 molal aqueous solution of a weak acid (HX) is 20 percent ionized...

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  8. A 0.0020 m aqueous solution in an ionic compound Co(NH3)5 (NO2)Cl fre...

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  9. A solution of sucrose (molar mass 342 "gmol"^(-1)) has been produced b...

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  10. The van't Hoff factor i for a compound which undergoes dissociation in...

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  11. The freezing point depression constant for water is -1.86^@C m^(-1). I...

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  12. PA and PB are the vapour pressure of pure liquid components. A and B, ...

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  13. Which of the following compounds can be used as antifreeze in automobi...

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  14. 6.02 xx 10^20 molecules of urea are present in 100 mL. of its solution...

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  15. Of the following 0.10 m aqueous solutions, which one will exhibit the ...

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  16. The boiling point of 0.2 mol "kg"^(-1) solution of X in water is great...

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  17. Mole fraction of the solute in a 1.00 molal aqueous solution is

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  18. Which one of the following electrolytes has the same value of van't Ho...

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  19. At 100^@ C the vapour pressure of a solution of 6.5 gm of a solute in ...

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  20. The percentage of pyridine (C5H5N) that forms pyridinium ion (C5H5N^(+...

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