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Recent questions tagged colligative-properties

The vapour pressure of pure liquid solvent A is 0.80atm.When a non volatile substance B is added to the solvent,its vapour pressure drops to 0.40atm,the mole fraction of component B in the solution is

asked Mar 25, 2014 by balaji.thirumalai

1 answer

Depression in freezing points of $0.1\;M$ aqueous solution of $HCl,CuSO_4$ and $K_2SO_4$ are

asked Feb 17, 2014 by sreemathi.v

1 answer

Which one of the following aqueous solutions has the lowest vapour pressure?

asked Feb 17, 2014 by sreemathi.v

1 answer

$PtCl_4.6H_2O$ can exist as a hydrated complex. If 1 molal aqueos solution has a depression in freezing point of $3.72^{\large\circ}$,assuming 100% ionization and $K_f$ of $1.86^{\large\circ}mol^{-1}kg$ which of the following is the complex in question?

asked Feb 14, 2014 by sreemathi.v

1 answer

Relative decrease in vapour pressure of an aqueous glucose dilute solution is found to be 0.018.What is the elevation in boiling point? (Given 1 molal aq.glucose solution boils at 100.62$^{\large\circ}C$ at 1 atm.pressure)

asked Feb 14, 2014 by sreemathi.v

1 answer

12.2gm of benzonic acid (M=122) in 100gm benzene has depression in freezing point $2.6^{\large\circ}C$; $K_f = 5.2 ^{\circ} mol^{-1}kg$. If there is 100% polymerization, the number of molecules of benzonic acid in associated state is

asked Feb 14, 2014 by sreemathi.v

1 answer

The van't Hoff factor of $CH_3COOH$ is less than unity. It indicates that the acetic acid

asked Feb 14, 2014 by sreemathi.v

1 answer

The 2.56gm of sulphur in 100gm of $CS_2$ has depression in freezing point of $0.010^{\large\circ}$C. $K_f=0.1^{\large\circ}C$/molal. Hence atomicity of sulphur in $CS_2$

asked Feb 14, 2014 by sreemathi.v

1 answer

Which of the following has the maximum osmotic at temperature T?

asked Feb 14, 2014 by sreemathi.v

1 answer

The freezing point (in$^{\large\circ}C)$ of a solution containing 0.1g of $K_3[Fe(CN)_6]$ (mol .wt .329) in 100g of water $(K_t=1.86Kkgmol^{-1})$

asked Feb 13, 2014 by sreemathi.v

1 answer

For dilute solutions containing 2.5g of a non-volatile non electrolyte solute in 100g of water,the elevation in boiling point at 1atm pressure is $4^{\large\circ}C$.Assuming concentration of solute is much lower than the concentration of solvent,the vapour pressure (mm of Hg) of the solution is (take $K_b=0.76Kkgmol^{-1})$

asked Feb 13, 2014 by sreemathi.v

1 answer

For dilute solutions containing 2.5g of a non-volatile non electrolyte solute in 100g of water,the elevation in boiling point at 1atm pressure is $2^{\large\circ}C$.Assuming concentration of solute is much lower than the concentration of solvent,the vapour pressure (mm of Hg) of the solution is (take $K_b=0.76Kkgmol^{-1})$

asked Feb 13, 2014 by sreemathi.v

1 answer

Ethylene glycol is used as an antifreeze in a cold climate.How much mass of ethylene glycol should be added to $5\;kg$ of water to prevent it form freezing at -$6^{\large\circ}C$ will be : $(K_t$ for water =$1.86Kkg mol^{-1}$ and molar mass of ethylene glycol=$62g mol^{-1})$

asked Feb 13, 2014 by sreemathi.v

1 answer

On mixing ,heptane and octane form an ideal solution.At 373K,the vapour pressures of the two liquid components (heptane and octane) are 105kPa and 45kPa respectively.Vapour pressure of the solution obtained by mixing 25g of heptane and 35g of octane will be (molar mass of heptane=100g $mol^{-1}$ and octane=114g$mol^{-1}$)

asked Feb 13, 2014 by sreemathi.v

1 answer

If sodium sulphate is considered to be completely dissociated into cations and anions in aqueous solution, what is the change in freezing point of water$(\Delta T_f)$,when 0.02mol of sodium sulphate is dissolved in 1kg of water,is $(K_f=1.86Kkgmol^{-1})$?

asked Feb 13, 2014 by sreemathi.v

1 answer

If 200 mL of 0.1 M urea solution is mixed with 300 mL of 0.2 M Glucose solutions at 300 K calculate osmotic pressure.

asked Feb 13, 2014 by sreemathi.v

1 answer

Which of the following solutions will freeze at the lowest temperature?

asked Feb 13, 2014 by sreemathi.v

1 answer

Which of the following solution boils at the highest temperature?

asked Feb 13, 2014 by sreemathi.v

1 answer

The Van't Hoff factor of $BaCl_2$ is

asked Feb 13, 2014 by sreemathi.v

1 answer

Which one of the following solutions will have the lowest freezing point?

asked Feb 13, 2014 by sreemathi.v

1 answer

When a substance is dissolved in a solvent,the vapour pressure of the solvent is decreased.This result in

asked Feb 13, 2014 by sreemathi.v

1 answer

Which of the following is the correct expression for van't Hoff factor?

asked Feb 13, 2014 by sreemathi.v

1 answer

When a solute is dissolved in a solvent,the elevation of boiling point of solution is

asked Feb 13, 2014 by sreemathi.v

1 answer

Which one of the following aqueous solution will exhibit abnormal osmotic pressure?

asked Feb 13, 2014 by sreemathi.v

1 answer

A 2% solution of non electrolyte X is isotonic with 1% of urea(mol.wt.60),the molecular weight of X is

asked Feb 13, 2014 by sreemathi.v

1 answer

A 0.3%(w/v) solution of urea (mol.wt.60) would be isotonic with

asked Feb 13, 2014 by sreemathi.v

1 answer

Which one of the following pair of solutions are expected to be isotonic at the same temperature?

asked Feb 13, 2014 by sreemathi.v

1 answer

Calculate osmotic pressure of a solutions having $0.1\; M\;NaCl$ and $0.2\; M\; Na_2SO_4$ and $0.5 M\; HA$. (Given: Weak acid is 20% dissociated at $300^{\circ}K$)

asked Feb 13, 2014 by sreemathi.v

1 answer

Osmotic pressure of a dilute solution is

asked Feb 13, 2014 by sreemathi.v

1 answer

Isotonic solutions have the same

asked Feb 13, 2014 by sreemathi.v

1 answer

Which one of the following statement is incorrect about osmotic pressure?

asked Feb 12, 2014 by sreemathi.v

1 answer

Osmotic pressure of a solution can be measured quickly and accurately by

asked Feb 12, 2014 by sreemathi.v

1 answer

Which one of the following completely dissociated salt solutions will give the lowering of vapour pressure double from its theoretical value?

asked Feb 12, 2014 by sreemathi.v

1 answer

The relative lowering of vapour pressure is equal to the molar fraction.This law is known as

asked Feb 12, 2014 by sreemathi.v

1 answer

Relative lowering of vapour pressure is directly proportional to

asked Feb 12, 2014 by sreemathi.v

1 answer

Which one of the following aqueous solution posses lowest vapour pressure?

asked Feb 12, 2014 by sreemathi.v

1 answer

The colligative properties depend upon

asked Feb 12, 2014 by sreemathi.v

1 answer

Which one of the following is considered as colligative property?

asked Feb 12, 2014 by sreemathi.v

1 answer

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