Recent questions tagged physical-chemistry

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

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According to Graham's law , at a given temperature , the ratio of rates of diffusion $\large\frac{r_A}{r_B}$ of gases A and B is given by:

asked Feb 13, 2014 by sharmaaparna1

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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

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The Compressibility factor for an ideal gas is

asked Feb 13, 2014 by sharmaaparna1

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X mL of $H_2$ gas effuses through a hole in a container is 5 Second. The time taken for the effusion of the same Volume of the gas Specified below under identical conditions is

asked Feb 13, 2014 by sharmaaparna1

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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

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

asked Feb 13, 2014 by sreemathi.v

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Which of the following solution boils at the highest temperature?

asked Feb 13, 2014 by sreemathi.v

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The Van't Hoff factor of $BaCl_2$ is

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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

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

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

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

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

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

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

asked Feb 13, 2014 by sreemathi.v

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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

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Isotonic solutions have the same

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

asked Feb 12, 2014 by sreemathi.v

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Two liquids X and Y are separated by a semipermeable membrane and if liquid flows from X to Y,it indicates that

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

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

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

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Relative lowering of vapour pressure is directly proportional to

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

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Which one of the following is considered as colligative property?

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How many moles of water are present in 90g of water?

asked Feb 12, 2014 by sreemathi.v

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Calculate the amount of ammonium sulphate required to prepare 500ml of 1 molar solution of ammonium sulphate? (m.wt of $(NH_4)_2SO_4$ is 132.14gm/mol)

asked Feb 12, 2014 by sreemathi.v

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If the molar mass of glucose is 180.2 g mol$^{-1}$ and if 36 gm of glucose $C_6H_{12}O_6$ is present in 1000 gm of an aqueous solution of glucose,it is said to be

asked Feb 12, 2014 by sreemathi.v

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One molal solution indicates

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Solubility of a substance in a solvent depends upon

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How much mass of urea $(NH_2CONH_2)$ is required in preparing 5 kg of 0.50 molal solution? (M.wt of urea=60g)

asked Feb 12, 2014 by sreemathi.v

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If 50ml of 0.5M $H_2SO_4$ is diluted to 1000 ml, what is the molarity of diluted solution?

asked Feb 12, 2014 by sreemathi.v

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What is the molarity of solution, if 60g of $Co(NO_3)_2.6H_2O$ dissolved in 4.3L of solution ?

asked Feb 12, 2014 by sreemathi.v

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What is the mole fraction of benzene in solution containing 20% by mass in $CCl_4$?

asked Feb 12, 2014 by sreemathi.v

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What is mass percentage of benzene $(C_6H_6)$ in carbon tetrachloride $(CCl_4)$ if 20g of benzene is dissolved in 180g of $CCl_4$?

asked Feb 12, 2014 by sreemathi.v

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A sample of $H_2SO_4$ solution is labeled 98% by weight. What is the normality of acid, given that the density of $H_2SO_4$ solution is 1.8g/ml.

asked Feb 12, 2014 by sreemathi.v

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A sample of $H_2SO_4$ solution is labeled 98% by weight. What is the molarity of acid, given that the density of $H_2SO_4$ solution is 1.8g/ml.

asked Feb 12, 2014 by sreemathi.v

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The ratio between the rms Speed of $H_2$ at 50K and that of $O_2$ at 800K is :

asked Feb 12, 2014 by sharmaaparna1

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In Van der waal's equation of state of the gas law the constant 'b' is a measure of :

asked Feb 12, 2014 by sharmaaparna1

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As the temperature is raised from $20^{\large\circ}C \;to \;40^{\large\circ}C$ , the average kinetic energy of neon atoms changes by a factor.

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What is the mole fraction of water in 20% w/w ethylene glycol solution?

asked Feb 12, 2014 by sreemathi.v

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According to kinetic theory of gases in an ideal gas between two successive collisions a gas molecule travels:

asked Feb 12, 2014 by sharmaaparna1

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What is the mole fraction of ethylene glycol $(C_2H_6O_2)$ in a solution containing 20% ethylene glycol by mass?

asked Feb 12, 2014 by sreemathi.v

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Which of the following is an example of solid solution?

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For an ideal gas , number of moles per litre in terms of its pressure P , gas constant R and temperature T is

asked Feb 12, 2014 by sharmaaparna1

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Which of the following is in an example of liquid solution?

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Kinetic theory of gases proves

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Which of the following is an example of gaseous solution?

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Value of gas Constant R is

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