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Recent questions tagged physical-chemistry

A solution of sodium sulphate in water is electrolysed using inert electrodes.The products at the cathode and anode are respectively

asked Jul 23, 2014 by sreemathi.v

1 answer

Faraday's law of electrolysis are related to the

asked Jul 23, 2014 by sreemathi.v

1 answer

Molten sodium chloride conducts electricity due to the presence of

asked Jul 23, 2014 by sreemathi.v

1 answer

The Henry's law constant for the solubility of $N_2$ gas in water is $1.0\times 10^5$ atm.The mole fraction of $N_2$ in air is 0.8.The amount of $N_2$ from air dissolved in 10mol of water at 298K and 5 atm pressure is

asked Jul 23, 2014 by sreemathi.v

1 answer

Twenty grams of hemoglobin in 1L solution at 300K is separated from pure water by a semipermeable.At equilibrium,the height of solution (density $1gcm^{-3}$) in a tube dipped in solution is found to be 83.1mm higher than in the tube dipped in water.If $g=10ms^{-2}$ ,the molar mass of hemoglobin is about

asked Jul 23, 2014 by sreemathi.v

1 answer

A solution containing $8.6gL^{-1}$ of urea (molar mass $60gmol^{-1}$) is isotonic with a 5% solution of unknown solute.The molar mass of the solute will be

asked Jul 23, 2014 by sreemathi.v

1 answer

The molar mass of sodium chloride determined by osmotic pressure would be

asked Jul 23, 2014 by sreemathi.v

1 answer

The freezing point of a solution containing 36g of a compound (empirical formula : $CH_2O$) in 1.20 kg of water is found to be $-0.93^{\large\circ}C$.The molecular formula of the solute is

asked Jul 23, 2014 by sreemathi.v

1 answer

A solution contains 10g of a solute and 116g of acetone at $30^{\large\circ}$C.Its vapour pressure is 290 Torr.If the vapour pressure of pure acetone is 300 Torr at $30^{\large\circ}$C,the molar mass of solute is

asked Jul 22, 2014 by sreemathi.v

1 answer

The vapour pressure of a pure liquid A is 10.0 Torr at $27^{\large\circ}C$,One gram of B is dissolved in 20g of A,the vapour pressure is lowered to 90 Torr.If the molar mass of A is $200gmol^{-1}$,the molar mass of B is

asked Jul 22, 2014 by sreemathi.v

1 answer

The vapour pressure of a solution of 5g of a nonelectrolyte in 100g water at a particular temperature is 2950 Pa and that of pure water at the same temperature is 3000 Pa.The molar mass of the solute is

asked Jul 22, 2014 by sreemathi.v

1 answer

The vapour pressure of a solution having 2.0g of a solute X(molar mass $32gmol^{-1}$) in 100g of $CS_2$ (vapour pressure 854 Torr) is 848.9 Torr.The molecular formula of the solute is

asked Jul 22, 2014 by sreemathi.v

1 answer

The molar mass of benzoic acid in benzene as determined by depression in freezing point method corresponds to

asked Jul 22, 2014 by sreemathi.v

1 answer

The vapour pressure of a pure liquid A is 80 mmHg at 300K.It forms an ideal solution with liquid B.When the mole fraction of B is 0.4,the total pressure was found to be 88 mmHg.The vapour pressure of liquid A would be

asked Jul 22, 2014 by sreemathi.v

1 answer

A binary solution contains 4 mol of A and 6 mol of B.Its vapour pressure is found to be 460mm Hg.To this solution,when 10 mol of B is added,its vapour pressure becomes 480mm Hg.The vapour pressures of pure A and pure B,respectively,are

asked Jul 22, 2014 by sreemathi.v

1 answer

The vapour pressure of n-hexane and n-heptane are 46 and 13mm Hg.If the vapour pressure of a solution of these two liquids is 38mmHg,the mole fraction of n-hexane in solution is

asked Jul 22, 2014 by sreemathi.v

1 answer

The vapour pressure of pure benzene and toluence are 160 Torr and 60 Torr,respectively.The mole fraction of benzene in vapour phase in contact with equimolar solution of benzene and toluene would be

asked Jul 22, 2014 by sreemathi.v

1 answer

The vapour pressure of pure liquid is 70 Torr at $27^{\large\circ}C$.The vapour pressure of a solution of this liquid and another liquid (mole fraction 0.2) is 84 Torr at $27^{\large\circ}C$.The vapour pressure of pure liquid B at $27^{\large\circ}C$ is

asked Jul 22, 2014 by sreemathi.v

1 answer

Which of the following solutions is expected to show negative deviations from Raoult's law?

asked Jul 22, 2014 by sreemathi.v

1 answer

Which of the following solutions is expected to show positive deviations from Raoult's law?

asked Jul 22, 2014 by sreemathi.v

1 answer

The vapour pressure of a solvent in a solution is proportional to

asked Jul 22, 2014 by sreemathi.v

1 answer

The vapour-pressure lowering of a solvent is proportional to

asked Jul 22, 2014 by sreemathi.v

1 answer

An azeotropic solution of two liquids has a boiling point higher than either of the boiling points of the two liquids when it

asked Jul 22, 2014 by sreemathi.v

1 answer

Which of the following is true?

asked Jul 22, 2014 by sreemathi.v

1 answer

The volume required to prepare 2.0L of 3.0M $H_2SO_4$ solution from 96% $H_2SO_4$ solution (density $1.83gmL^{-1}$) is

asked Jul 22, 2014 by sreemathi.v

1 answer

An aqueous solution of HCl has 2% mass of HCl and a density of $1.02gcm^{-3}$ .The numerical values of molarity and molality,respectively, are

asked Jul 22, 2014 by sreemathi.v

1 answer

The volume of 96% $H_2SO_4$ (density $1.83gmL^{-1}$) required to prepare 2.0L of 3.0M $H_2SO_4$ solution is

asked Jul 22, 2014 by sreemathi.v

1 answer

What mass of ethanol be added to 1.0Kg water to have the mole fraction of ethanol equal to 0.20?

asked Jul 22, 2014 by sreemathi.v

1 answer

A molal solution is one that contains one mole of a solute in

asked Jul 22, 2014 by sreemathi.v

1 answer

The density of a 10.0% by mass KCl solution in water is $1.06gcm^{-3}$,its molarity is

asked Jul 22, 2014 by sreemathi.v

1 answer

For the electrochemical cell,$M|M^+||X^-|X,E^{\large\circ}(M^+|M)=0.44V$ and $E^{\large\circ}(X|X^-)=0.33V$.From this data one can deduce that

asked Jul 22, 2014 by sreemathi.v

1 answer

A gas X at 1 atm is bubbled through a solution containing a mixture of 1M Y and 1M Z at $25^{\large\circ}C$.If the reduction potential of $Z > Y > X$,then

asked Jul 22, 2014 by sreemathi.v

1 answer

The standard reduction potential values of three metallic cations,X,Y,Z are 0.52,-3.03 and -1.18V,respectively.The order of reducing power of the corresponding metals is

asked Jul 22, 2014 by sreemathi.v

1 answer

A standard hydrogen electrode has zero electrode potential because

asked Jul 22, 2014 by sreemathi.v

1 answer

The standard reduction potentials of $Cu^{2+}|Cu$ and $Cu^{2+}|Cu^+$ are 0.337V and 0.153V, respectively.The standard electrode potential of $Cu^+|Cu$ half cell is

asked Jul 22, 2014 by sreemathi.v

1 answer

A solution containing one mole per litre each of $Cu(NO_3)_2,AgNO_3,Hg_2(NO_3)_2$ is being electrolysed by using inert electrodes.The values of standard potentials are $E^{\large\circ}_{Ag^+|Ag}=0.80V,E^{\large\circ}_{Hg_2^{2+}|Hg}=0.79V,E^{\large\circ}_{Cu^{2+}|Cu}=0.34V,E^{\large\circ}_{Mg^{2+}|Mg}=-2.3V$ with increasing voltage,the sequence of deposition of metals on the cathode will be

asked Jul 22, 2014 by sreemathi.v

1 answer

Adding powdered Pb and Fe to a solution containing 1.0M in each of $Pb^{2+}$ and $Fe^{2+}$ ions would result into the formation of

asked Jul 22, 2014 by sreemathi.v

1 answer

Consider the cell potentials $E^{\large\circ}_{Mg^{2+}|Mg}=-2.37V$ and $E^{\large\circ}_{Fe^{3+}|Fe}=-0.04V$.The best reducing agent would be

asked Jul 21, 2014 by sreemathi.v

1 answer

Which of the following facts is not true?

asked Jul 21, 2014 by sreemathi.v

1 answer

The following facts are available.\[\begin{array}{1 1}2X^-+Y_2\rightarrow 2Y^-+X_2\\2W^-+Y_2\rightarrow\text{No reaction}\\2Z^-+X_2\rightarrow 2X^-+Z_2\end{array}\] Which of the following statements is correct?

asked Jul 21, 2014 by sreemathi.v

1 answer

The current of 9.65A is drawn from a Daniell cell for exactly 1h.If molar masses of Cu and Zn are $63.5gmol^{-1}$ and $6.54gmol^{-1}$,respectively,the loss in mass at anode and gain in mass at cathode,respectively,are

asked Jul 21, 2014 by sreemathi.v

1 answer

A galvanic cell which makes use of the following reaction at 298K. $Cr_2O_7^{2-}+14H^++6Fe^{2+}\rightarrow 2Cr^{3+}+6Fe^{3+}+7H_2O$.Given : $E^{\large\circ}(Cr_2O_7^{2-},H^+,Cr^{3+}|Pt)=1.33V;E^{\large\circ}(Fe^{3+},Fe^{2+}|Pt)=0.77V$.The strongest reductant is

asked Jul 21, 2014 by sreemathi.v

1 answer

A galvanic cell which makes use of the following reaction at 298K. $Cr_2O_7^{2-}+14H^++6Fe^{2+}\rightarrow 2Cr^{3+}+6Fe^{3+}+7H_2O$.Given : $E^{\large\circ}(Cr_2O_7^{2-},H^+,Cr^{3+}|Pt)=1.33V;E^{\large\circ}(Fe^{3+},Fe^{2+}|Pt)=0.77V$.The strongest oxidant is

asked Jul 21, 2014 by sreemathi.v

1 answer

A galvanic cell which makes use of the following reaction at 298K. $Cr_2O_7^{2-}+14H^++6Fe^{2+}\rightarrow 2Cr^{3+}+6Fe^{3+}+7H_2O$.Given : $E^{\large\circ}(Cr_2O_7^{2-},H^+,Cr^{3+}|Pt)=1.33V;E^{\large\circ}(Fe^{3+},Fe^{2+}|Pt)=0.77V$.Reducing $[Cr^{3+}]$ to 0.50M,keeping all other concentrations at unity,the emf of the cell would be changed by

asked Jul 21, 2014 by sreemathi.v

1 answer

A galvanic cell which makes use of the following reaction at 298K. $Cr_2O_7^{2-}+14H^++6Fe^{2+}\rightarrow 2Cr^{3+}+6Fe^{3+}+7H_2O$.Given : $E^{\large\circ}(Cr_2O_7^{2-},H^+,Cr^{3+}|Pt)=1.33V;E^{\large\circ}(Fe^{3+},Fe^{2+}|Pt)=0.77V$.If $[Cr_2O_7^{2-}]=1.0M,[Cr^{3+}]=0.5M,[Fe^{2+}]=0.5M,[Fe^{3+}]=2.0M$ and $[H_3O^+]=2.0M$,then the cell emf at 298K would be

asked Jul 21, 2014 by sreemathi.v

1 answer

A galvanic cell which makes use of the following reaction at 298K. $Cr_2O_7^{2-}+14H^++6Fe^{2+}\rightarrow 2Cr^{3+}+6Fe^{3+}+7H_2O$.Given : $E^{\large\circ}(Cr_2O_7^{2-},H^+,Cr^{3+}|Pt)=1.33V;E^{\large\circ}(Fe^{3+},Fe^{2+}|Pt)=0.77V$.Increasing $[H_3O^{+}]$ to 2.0M, keeping all other concentrations at unity,will change the cell emf by

asked Jul 21, 2014 by sreemathi.v

1 answer

A galvanic cell which makes use of the following reaction at 298K. $Cr_2O_7^{2-}+14H^++6Fe^{2+}\rightarrow 2Cr^{3+}+6Fe^{3+}+7H_2O$.Given : $E^{\large\circ}(Cr_2O_7^{2-},H^+,Cr^{3+}|Pt)=1.33V;E^{\large\circ}(Fe^{3+},Fe^{2+}|Pt)=0.77V$.Increasing $[Fe^{3+}]$ to 2.0M keeping all other concentrations at unity,the emf of the cell is changed by

asked Jul 21, 2014 by sreemathi.v

1 answer

A galvanic cell which makes use of the following reaction at 298K. $Cr_2O_7^{2-}+14H^++6Fe^{2+}\rightarrow 2Cr^{3+}+6Fe^{3+}+7H_2O$.Given : $E^{\large\circ}(Cr_2O_7^{2-},H^+,Cr^{3+}|Pt)=1.33V;E^{\large\circ}(Fe^{3+},Fe^{2+}|Pt)=0.77V$.Reducing $[Fe^{3+}]$ to 0.50M keeping all other concentrations at unity,the emf of the cell will be changed by

asked Jul 21, 2014 by sreemathi.v

1 answer

A galvanic cell which makes use of the following reaction at 298K. $Cr_2O_7^{2-}+14H^++6Fe^{2+}\rightarrow 2Cr^{3+}+6Fe^{3+}+7H_2O$.Given : $E^{\large\circ}(Cr_2O_7^{2-},H^+,Cr^{3+}|Pt)=1.33V;E^{\large\circ}(Fe^{3+},Fe^{2+}|Pt)=0.77V$.Upon discharge of the cell for 80 min at one ampere,the anode was found to have decreased in mass by

asked Jul 21, 2014 by sreemathi.v

1 answer

A galvanic cell which makes use of the following reaction at 298K. $Cr_2O_7^{2-}+14H^++6Fe^{2+}\rightarrow 2Cr^{3+}+6Fe^{3+}+7H_2O$.Given : $E^{\large\circ}(Cr_2O_7^{2-},H^+,Cr^{3+}|Pt)=1.33V;E^{\large\circ}(Fe^{3+},Fe^{2+}|Pt)=0.77V$.The cell emf is independent of

asked Jul 21, 2014 by sreemathi.v

1 answer

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