Solutions practice · Medium

Statement II: The vapour pressure of $0.1 \mathrm{~M}$ sugar solution is more than that of $0.1 \mathrm{~M} \mathrm{~KCl}$ solution.

Statement II: Lowering of vapour pressure is directly proportional to the number of species present in the solution.

A sugar syrup weighing $214.2 \mathrm{~g}$, contains $34.2 \mathrm{~g}$ of water. The molal concentration is:

Consider following solutions in given solvents:
I: $0.3 \mathrm{~M}$ aqueous glucose solution
II: $0.2 \mathrm{~M}$ aqueous sodium chloride solution
III: $0.3 \mathrm{~M}$ aqueous ammonium phosphate solution
IV: $0.4 \mathrm{~M}$ benzoic acid in benzene (dimerises upto $50 \%$)
Select incorrect statement from given options for the above given solutions:

Assertion : If a liquid solutemore volatile than the solvent is added to the solvent, the vapour pressure of the solution may increase i.e., $p_{{s}}>p^0$.

Reason : In the presence of a more volatile liquid solute, only the solute will form the vapours and solvent will not.

Assertion: The activity coefficients of the components in an ideal solution are equal to 1.

Reason: In an ideal solution, the interactions between the two components are the same as the interactions between like molecules.

$58.5 \mathrm{~g}$ of $\mathrm{NaCl}$ and $180 \mathrm{~g}$ of glucose were separately dissolved in $1000 \mathrm{~mL}$ of water. Identify the correct statement regarding the elevation of boiling point (bp) of the resulting solution.

If the various terms in the below given expressions have usual meanings, the van’t Hoff factor (i) cannot be calculated by which one of the expressions?

$0.1 \mathrm{~M} \mathrm{~NaCl}$ and $0,005 \mathrm{~M} \mathrm{~BaCl}_2$ solutions are separated by a semipermeable membrane in a container. For this system, choose the correct answer.

Find final molarity of solution made by $500 \mathrm{~ml} \, 0.1 \mathrm{~M} \, {HCl}+500 \mathrm{~ml} \, 0.2 \mathrm{~M} \, {HCl}.$

Assertion (A): On increasing temperature vapour pressure of solution increases.

Reason (R): Vapour pressure of ether is higher than alcohol.

Which of the following will have the lowest vapour pressure

Which of the given solutions has highest osmotic pressure?

A solution of $6 \%$ (mass $/ {vol}$.) urea is isotonic with ${NaCl}_{a q}$. What is the mass/vol. $\%$ of ${NaCl}$ in solution?

The boiling point of ${CHCl}_3$ was raised by $0.323^{\circ} {C}$ when $0.5143 {~g}$ of anthracene was dissolved in $35 {~g} {CHCl}_3$. Calculate the molar mass of anthracene. $K_b^{\prime}$ for ${CHCl}_3=3.9 {~K} {~mol}^{-1} {~kg}$.

$\mathrm{H}_2 \mathrm{S},$ a toxic gas with rotten egg like smell, is used for the quantitative analysis. If the solubility of $\mathrm{H}_2 \mathrm{S}$ in water at STP is $0.2 \mathrm{~m},$ then Henry's law constant for $\mathrm{H}_2 \mathrm{S}$ in water at $273 \mathrm{~K}$ is

Determine the molarity of a $40 \%$ solution of $\mathrm{HCl}$ which has a density of $1.2 \mathrm{~g} \mathrm{~mL}^{-1}$.

Concentration terms which are independent of temperature is/are

How much ${{\mathrm{K}_2}\mathrm{C}{\mathrm{r}_2}{\mathrm{O}_7}}$ (Mol. wt. = 294.19) is required to prepare one litre of 0.1 N solution?

At $100^{\circ} \mathrm{C},$ the vapour pressure of a solution of $4.0 \mathrm{~g}$ of solute in $100 \mathrm{~g}$ of water is $750 \mathrm{~mm}.$ The boiling point of the solution is $\left(\mathrm{K}_{\mathrm{b}}\right.$ of water $=0.52$ $\mathrm{K}-\mathrm{kg} / \mathrm{mol})$

The solubility of iodine in water is ${0.8\;g/L}$. If the partition coefficient of iodine between ${\mathrm{CC}{\mathrm{l}_4}}$ and water (in favour of ${\mathrm{CC}{\mathrm{l}_4}}$) is 82, the solubility of iodine in ${\mathrm{CC}{\mathrm{l}_4}}$ is :

Assertion: Van't Hoff factor for benzoic acid in benzene is one.

Reason: Benzoic acid behaves as a weaker electrolyte in benzene.

Assertion : Themolecular weight of acetic acid determined by depression in freezing point method in benzene and water was found to be different.

Reason : Water is polar and benzene is non-polar.

Which of the following statements is true about Henry's law?

The pair of boiling point and compound are given as,

$\begin{array}{cccccccccccccccccccc} {{C_6}{H_6}}&{C{H_3}OH}&{{C_6}{H_5}N{O_2}}&{{C_6}{H_5}N{H_2}} \\ {80^\circ C}&{65^\circ C}&{212^\circ C}&{184^\circ C} \\ {\left( {\text{I}} \right)}&{\left( {{\text{II}}} \right)}&{\left( {{\text{III}}} \right)}&{\left( {{\text{IV}}} \right)} \end{array}$

Which will show lowest vapour pressure at room temperature?

35.4 mL of HCl is required for the neutralisation of a solution containing 0.275 g of sodium hydroxide. The normality of hydrochloric acid is

Addition of $0.643 \mathrm{~g}$ of a compound to $50 \mathrm{~mL}$ of benzene (density $=0.879 \mathrm{~g} / \mathrm{mL})$ lowers the freezing point from $5.51^{\circ} \mathrm{C}$ to $5.03^{\circ} \mathrm{C}$. If $\mathrm{K}_{\mathrm{f}}$ for benzene is $5.12 \mathrm{~K ~kg ~mol}^{–1},$ calculate the molecular weight of the compound.

Assertion (A): Aquatic species are more comfortable in cold water rather than in warm water.

Reason (R): The solubility of gas ${O}_2$, increases with decrease of temperature due to increase of ${K}_{{H}}.$

The van't Hoff factor (i) for a dilute aqueous solution of glucose is:

Phenol dimerizes in benzene. If the observed molecular mass of phenol in solution is 120, then its degree of dimerization is

Which of the following acid has the same molecular weight and equivalent weight.