Recent questions tagged physical-chemistry

two charged particles having equal charge 5 µC each are brought to infinity to within a separation of 10 m . increase in potential energy of the system is

asked May 31, 2018 by mirthun8

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The rate of reaction for A---> products is 10 mol.lit-1.min-1 at time t1=5minutes. what will be the rate at the time t2=10minutes

asked Jul 7, 2015 by excellentdeals18

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A sample of wustite $Fe_xO$ contains one $Fe(III)$ for every three $Fe(II).$ Calculate the value of x.

asked Aug 11, 2014 by meena.p

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The composition of a sample of wiistite is $Fe_{0.93} O_{1.00-}$. What percentage of the ion is present in the form of $Fe(III)?$

asked Aug 11, 2014 by meena.p

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Calculate the percentage of void volume in the body centred

asked Aug 11, 2014 by meena.p

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Calculate the percentage of void volume in the primitive

asked Aug 11, 2014 by meena.p

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Lil occurs as cubical - closest packing . If the edge length of a unit cell is $624\;pm$ , determine the ionic radii of $Li^{+}$ and $I^{-}$ ions.

asked Aug 11, 2014 by meena.p

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KCl crystallizes in the same type of lattice as does $NaCl$ . Given that $\large\frac{r_{Na^{+}}}{r_{cl^{-}}}$$=0.5$ and $\large\frac{r_{Na^{+}}}{r_{K^{+}}}$$=0.5$ calculate the ratio of density of NaCl to that KCl

asked Aug 11, 2014 by meena.p

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KCl crystallizes in the same type of lattice as does $NaCl$ . Given that $\large\frac{r_{Na^{+}}}{r_{cl^{-}}}$$=0.5$ and $\large\frac{r_{Na^{+}}}{r_{K^{+}}}$$=0.5$ calcute the ratio of the unit cell for $KCl$ to that for $NaCl$

asked Aug 11, 2014 by meena.p

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If the radius of $Cs^{+}$ is $169\;pm$ and that of $Cl^{-}$ is $181\;pm$ , predict the structure of $CsCl$. What is the coordination number of $Cs^{+}$ ion ?

asked Aug 11, 2014 by meena.p

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A solid $A^{+}B^{-}$ has an $NaCl$ type closet packed structure . If the radius of the anion is $250\;pm$ What is the radius of the cation ?

asked Aug 8, 2014 by meena.p

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The atomic radius of stronitum is $215\;pm$ and it crystallizes with a cubical closest - packed structure . Calculate the density of strontium. The molar mass of strontium is $ 87.6\;g\;mol^{-1}$

asked Aug 8, 2014 by meena.p

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Caesium chloride may be considered to form interpenetrating simple primitive cubic crystals. The edge length of unit cell is $412\;pm$. Determine the ionic radius of $Cs^{+}$ if the ionic radius of $Cl^{-}$ if the ionic radius of $Cl^{-}$ is $181$ P.m Given $M(C_s)=133\;g\;mol^{-1}$

asked Aug 8, 2014 by meena.p

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Caesium chloride may be considered to form interpenetrating simple primitive cubic crystals. The edge length of unit cell is $412\;pm$. Determine the density of $CsCl$

asked Aug 8, 2014 by meena.p

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The edge length of cubic unit cell of metallic calcium is $556\;pm$ If the density of calcium is $1.54 \;g\;cm^{-3}$ and its molar mass is $40.08];g\;mol^{-1}$ calculate the radius of calcium atom.

asked Aug 8, 2014 by meena.p

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Calculate the radius of molybdenum atom if the element crystallizes as body- centred cubic crystals. Given: Density of $Mo=10.3\;g\;cm^{-3}$ and molar mass of $Mo= 95.94 \;g\;mol^{-1}$

asked Aug 8, 2014 by meena.p

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The van't Hoff factor of the compound $K_3Fe(CN)_6$ in dilute solution is

asked Aug 8, 2014 by meena.p

2 answers

The Van't Hoff factor of acetic acid in water will be

asked Aug 8, 2014 by meena.p

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The van't hoff factor for $0.1\; molal\;Ba(NO_3)_2$ solution is $ 2.74$. Its degree of dissociation is

asked Aug 8, 2014 by meena.p

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Which of following electrolytes would have the same van't hoff factor as that of potassium ferricyanide ?

asked Aug 8, 2014 by meena.p

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The Van't Hoff factor of benzoic acid in benzene is found to be

asked Aug 8, 2014 by meena.p

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The degree of dissociation $(\alpha)$ of a weak electrolyte $A_xB_y$ is related to van't Hoff factor (i) by the expression

asked Aug 8, 2014 by meena.p

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A $ 0.004\;M$ solution of $K_2SO_4$ is isotonic with a $0.010\;M$ Solution of glucose at the same temperature . Tge apparent per cent degree of dissociation of $K_2SO_4$ is

asked Aug 7, 2014 by meena.p

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Which of the following pairs of solutions are expected to be isotonic?

asked Aug 7, 2014 by meena.p

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In the phenomenon of osmosis through the semipermeable membrane

asked Aug 7, 2014 by meena.p

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The osmotic pressure of $0.1\;M$ sodium chloride solution at $27^{\circ}C$ is

asked Aug 7, 2014 by meena.p

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The osmotic pressure of a solution $(density =1.02\;g \;cm^{-3})$ Containing 50 g glucose $(C_6H_{12}O_6)$ in 1 kg of water at 300 K is

asked Aug 7, 2014 by meena.p

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A semipermeable membrane used in the measurement of osmotic pressure of a solution allows the passage of

asked Aug 7, 2014 by meena.p

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A solution containing $0.5\;g$ of a solute (molar mass 130 g\;mol^{-1})$ in $50 \;g\;CCl_4$ yields a boiling point elevation of boiling point . The molar mass of solute is about

asked Aug 7, 2014 by meena.p

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The solvent $CS_2$ has enthalpy of vapourization of $352\;J\;g^{-1}$ and boiling point equal to $320\;K$. The value of $K_b$ for this solvent is about.

asked Aug 7, 2014 by meena.p

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A solvent of molar mass $84.2 \;g\;mol^{-1}$ and boiling point $81.4^{\circ}C$ has boiling point elevation constant equal to $ 2.79 \;K\;kg\;mol^{-1}$. Its molar enthalpy of vapourization will be about

asked Aug 7, 2014 by meena.p

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A sucrose solution in 50 g water boils at $100.15^{\circ}C$ , If this solution is heated till its temperature is $100.375^{\circ}C$, how much of water is evaporated ? Given :$ K_b(water)=0.52\;K\;kg\;mol^{-1}$

asked Aug 7, 2014 by meena.p

1 answer

An involatile solute A dimerizes in a solvent as $2A \rightleftharpoons A_2$ . If m is the molarity of solute in the solution , then the equilibrium constant of the reaction is given as

asked Aug 6, 2014 by meena.p

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The elevation in boiling point when $20.16\;g$ of freshly prepared $CuCl_2$ (relative molar mass : $134.4$) is dissolved in $1\;kg$ of water $(K_b=0.52\;kg\;K \;mol^{-1})$ is

asked Aug 6, 2014 by meena.p

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When mercuric iodide is added to an aqueous solution of potassium iodide, the

asked Aug 6, 2014 by meena.p

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The elevation of boiling point of water produced by dissolving $1.17 g$ sodium chloride in $100 g$ water $K_b=0.512\;K\;kg\;mol^{-1})$ is

asked Aug 6, 2014 by meena.p

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The boiling point of water at $735$Torr is $99.07^{\circ}C$ . The mass of $NaCl$ added in $100\;g$ water $(K_b=0.51\;K\;kg\;mol^{-1})$ to make its boiling point $100^{\circ}C$ is

asked Aug 6, 2014 by meena.p

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For an ideal solution containing a nonvolatile solute, Which of the following expression is correctly represented ?

asked Aug 6, 2014 by meena.p

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Which of the following solvents has the largest value of $K_f$?

asked Aug 6, 2014 by meena.p

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The molar mass and the freezing point of camphor are $152.2\;g\;mol^{-1} $ and $178.4^{\circ} C $ respectively . The cryoscopic constant of camphor is $ 37.7\;K\;kg\;mol^{-1}$, the molar enthalpy of fusion of camphor is about

asked Aug 6, 2014 by meena.p

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If the freezing point depression constant of a solvent is $20.0\;K\;kg\;mol^{-1}$. If its $\Delta_{fus} H^0_m=2.74\;kJ\;mol^{-1}$ and its molar mass is $84.2\;g\;mol^{-1}$ the normal freezing point of the solvent would be about

asked Aug 6, 2014 by meena.p

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For water , $ \Delta _{fus} H^3_m=2.74 \;kJ\;mol^{-1}$ and its molar mass is $ 84.2\;g \;mol^{-1} $ the normal freezing point depression constant at 1 atm pressure would be about

asked Aug 6, 2014 by meena.p

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When $20\;g$ of naphthoic acid $(C_{11}H_gO_2)$ is dissolved in $50 \;g$ of benzene $(K_t =1.72\;K\;kg\;mol^{-1}).$, a freezing point depression of $2 K$ is observe. The van't Hoff factor (i) is

asked Aug 6, 2014 by meena.p

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The unit of freezing point depression constant is

asked Aug 6, 2014 by meena.p

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The freezing point of a $0.05$ molal solution of a nonelectrolyte in water is

asked Aug 6, 2014 by meena.p

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The molar mass of acetic acid dissolved in benzene determined from the depression in freezing point is found to be

asked Aug 6, 2014 by meena.p

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The freezing point of equimolal solution will be lowest for

asked Aug 6, 2014 by meena.p

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Which of the following exhibits the greater freezing - point lowering ?

asked Aug 6, 2014 by meena.p

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When a sugar- solution is slowly frozen, the first solid which separates out is

asked Aug 6, 2014 by meena.p

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Pure Benzene freezes at $5.4 ^{\circ}\;C$. A solution of $0.223 \;g$ of phenyl acetic acid $(C_6 H_5 CH_2 COOH)$ in $4.4\;g$ benzene $(K_f =5.12 K\; Kg\;mol^{-1}) $ freezes at $4.47 ^{\circ}$ . From this observation , one can conclude that

asked Aug 5, 2014 by meena.p

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