Recent questions in Chemistry

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

asked Aug 7, 2014 by meena.p

1 answer

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

1 answer

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

1 answer

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

1 answer

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

Which of the following is not an example of Disproportionation in acidic medium?

asked Aug 6, 2014 by balaji.thirumalai

1 answer

Which of the following is NOT true about Cerium (Atomic Number = 58, Electron configuration = [Xe] 4f $^1$ 5d $^1$ 6s $^2$ )?

asked Aug 6, 2014 by balaji.thirumalai

1 answer

Which of the following is NOT a consequence of Lanthanide contraction?

asked Aug 6, 2014 by balaji.thirumalai

1 answer

Which of the following is NOT a point of similarity between Lanthanides and Actinides?

asked Aug 6, 2014 by balaji.thirumalai

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

1 answer

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

1 answer

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

asked Aug 6, 2014 by meena.p

1 answer

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

1 answer

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

1 answer

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

asked Aug 6, 2014 by meena.p

1 answer

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

asked Aug 6, 2014 by meena.p

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

The unit of freezing point depression constant is

asked Aug 6, 2014 by meena.p

1 answer

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

asked Aug 6, 2014 by meena.p

1 answer

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

1 answer

The freezing point of equimolal solution will be lowest for

asked Aug 6, 2014 by meena.p

1 answer

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

asked Aug 6, 2014 by meena.p

1 answer

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

asked Aug 6, 2014 by meena.p

1 answer

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

1 answer

Assuming $100\%$ ionization , the increasing order of the freezing point of the solution will be

asked Aug 5, 2014 by meena.p

1 answer

A solution contains $0.1 \; mol$ of acetamide in 1L of glacial acetic acid . When the solution is cooled , the first crystals that appeared at the freezing point contain the molecules of

asked Aug 5, 2014 by meena.p

1 answer

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

asked Aug 5, 2014 by meena.p

1 answer

The freezing point of equimolal aqueous solution will be highest for

asked Aug 5, 2014 by meena.p

1 answer

Which of the following $0.1 \;M$ aqueous solution will have the lowest freezing point ?

asked Aug 5, 2014 by meena.p

1 answer

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

asked Aug 5, 2014 by meena.p

1 answer

$5 g$ of a nonvolatile compound (molar mass $50\; g \;mol^{-1}$ ) is added to 100 g of water . If the decrease of pressure is $11.31$ Torr, the vapour pressure of water will be

asked Aug 5, 2014 by meena.p

1 answer

The vapour pressure of a solvent is found to be $400 mm$ Hg at $300 K$ When a certain amount of nonvolatile solute added to $50\;mol$ of the solvent its vapour pressure decreases to $360\;mm Hg$ . The amount of solute added is:

asked Aug 5, 2014 by meena.p

1 answer

Which of the following is true about the oxidation state of transition metals?

asked Aug 4, 2014 by balaji.thirumalai

1 answer

Which of the following has maximum number of unpaired electrons?

asked Aug 4, 2014 by balaji.thirumalai

1 answer

Which of the following statements about electron configuration of f-block statements is INCORRECT?

asked Aug 4, 2014 by balaji.thirumalai

1 answer