Solutions

Arrange the following solutions in order of their increasing boiling points

\(\left(\mathrm{i}\right){10}^{-4}\mathrm{M}\mathrm{NaCl}\\ \left(\mathrm{ii}\right){10}^{-4}\mathrm{M}\mathrm{Urea}\\ \left(\mathrm{iii}\right){10}^{-3}\mathrm{M}\mathrm{NaCl}\\ \left(\mathrm{iv}\right){10}^{-2}\mathrm{M}\mathrm{NaCl}\)

The density of ' \(x\) ' \(\mathrm{M}\) solution (' \(x\) ' molar) of \(\mathrm{NaOH}\) is \(1.12\mathrm{g}{\mathrm{mL}}^{-1}\), while in molality, the concentration of the solution is \(3\mathrm{m}(3\mathrm{molal})\). Then \(x\) is
(Given : Molar mass of \(\mathrm{NaOH}\) is \(40\mathrm{g}/\mathrm{mol}\) )

[JEE Main 2024, 6 Apr (Shift 1)]

Identify the mixture that shows positive deviations from Raoult's Law

1.24 g of \(A{X}_{2}\) (molar mass \(124gmo{l}^{-1}\)) is dissolved in 1 kg of water to form a solution with boiling point of \(100.0156^\circ C\), while 25.4 g of \(A{Y}_{2}\) (molar mass \(250gmo{l}^{-1}\)) in 2 kg of water constitutes a solution with a boiling point of \(100.0260^\circ C\).

\({K}_{b}\left({H}_{2}O\right)=0.52Kkgmo{l}^{-1}\)

Which of the following is correct ?

[JEE Main 2025, 29 Jan (Shift 1)]

The Henry's law constant \(\left({\mathrm{K}}_{\mathrm{H}}\right)\) values of three gases (A, B, C) in water are \(145,2\times {10}^{-5}\) and \(35\mathrm{kbar}\), respectively. The solubility of these gases in water follow the order

200 ml of 0.2 M NaOH is mixed with 400 ml of 0.5 M NaOH solution. Molarity of mixture is (memory based jee mains shift-2 22/01/2025)

The Molarity (M) of an aqueous solution containing \(5.85\mathrm{g}\) of \(\mathrm{NaCl}\) in \(500\mathrm{mL}\) water is (Given : Molar Mass \(\mathrm{Na}\): \(23\) and \(Cl:35.5gmo{l}^{-1}\))

[JEE Main 2024, 4 Apr (Shift 1)]

30gm \({\mathrm{HNO}}_{3}\)is added to a solution to prepare 75 % w/ w solution having density 1.25 g / mL. Volume of solution is?

Memory Based Question 28/Jan/25 Evening shift

When a non-volatile solute is added to the solvent, the vapour pressure of the solvent decreases by 10 mm Hg. The mole fraction of the solute in the solution is 0.2. What would be the mole fraction of the solvent if decrease in vapour pressure is 20 mm Hg?

[JEE Main 2025, 23 Jan (Shift 2)]

What is the value of van't Hoff Factor for \({\mathrm{A}}_{2}\mathrm{B}\) if 30% of \({\mathrm{A}}_{2}\mathrm{B}\) is dissociated?

The plots of \(\frac{1}{{\mathrm{X}}_{\mathrm{A}}}and\frac{1}{{Y}_{A}}(where{\mathrm{X}}_{\mathrm{A}}\mathrm{and}{\mathrm{Y}}_{\mathrm{A}}\mathrm{are}\mathrm{the}\mathrm{mole}\mathrm{fraction}\mathrm{of}\mathrm{liquid}\mathrm{A}\mathrm{in}\mathrm{liquid}\mathrm{and}\mathrm{vapour}\mathrm{phase}\mathrm{respectively})\) is linear with slope and intercepts respectively

(Memory Based JEE Mains 23/01/2025 ,Shift -2)

Identify the mixture that shows positive deviations from Raoult's Law

58.5 g of NaCl and 180 g of glucose were separately dissolved in 1000 mL of water.Identify the correct statement regarding the elevation of boiling point of the resulting solution.

In a 3M aqueous solution of NaCl, having density 1.25 g/ml, what will be the molality of the solution?

Compare boiling point of given solutions:

(Memory Based JEE Mains 22/01/2025 Shift-1)
\((\mathrm{i}){10}^{-4}\mathrm{M}\mathrm{NaCl}\\ (\mathrm{ii}){10}^{-3}\mathrm{M}\mathrm{NaCl}\\ (\mathrm{iii}){10}^{-2}\mathrm{M}\mathrm{NaCl}\\ (\mathrm{iv}){10}^{-4}\mathrm{M}\mathrm{Urea}\)

Assume a living cell with \(0.9\%(\omega /\omega )\) of glucose solution (aqueous). This cell is immersed in another solution having equal mole fraction of glucose and water.
(Consider the data upto first decimal place only)
The cell will

[JEE Main 2025, 28 Jan (Shift 2)]

In a 3M aqueous solution of NaCl, having density 1.25 g/ml, what will be the molality of the solution?

What is the freezing point depression constant of a solvent 50 g of which contain 1 g of non-volatile solute(M.W: 256 g/mol and depression in freezing point is 0.4 K.
Memory Based Question 28/Jan/25 Morning shift

Molality \(( m )\) of \(3 M\) aqueous solution of \(NaCl\) is

(Given : Density of solution \(=1.25 ~g mL ^{-1}\), Molar mass in \(g mol ^{-1}\) : \(\mathrm{Na}:23,\mathrm{Cl}:35.5\))

[JEE Main 2024, 6 Apr (Shift 2)]

The amount of glucose required to prepare \(250\mathrm{mL}\) of \(\frac{M}{20}\) aqueous solution is:
(Molar mass of glucose : \(180\mathrm{g}{\mathrm{mol}}^{-1}\))

The plot of osmotic pressure \(\pi\) vs concentration \(\left(mol{L}^{-1}\right)\) for a solution gives a straight line with slope \(25.73Lbarmo{l}^{-1}\). The temperature at which the osmotic pressure measurement is done is: (Use \(R=0.083Lbarmo{l}^{-1}{K}^{-1}\) )

[NEET 2024]

Given below are two statements :
Statement (I) : NaCl is added to the ice at \(0^\circ C\), present in the ice cream box to prevent the melting of ice cream.
Statement (II) : On addition of NaCl to ice at \(0^\circ C\), there is a depression in freezing point.
In the light of the above statements, choose the correct answer from the options given below

What is the freezing point depression constant of a solvent, 50 g of which contain 1 g non volatile solute (molar mass \(256gmo{l}^{-1}\) ) and the decrease in freezing point is 0.40 K ?

[JEE Main 2025, 28 Jan (Shift 1)]

In which mode of expression, the concentration of a solution remains independent of temperature?

Compare boiling point of given solutions:

(Memory Based JEE Mains 22/01/2025 Shift-1)
\((\mathrm{i}){10}^{-4}\mathrm{M}\mathrm{NaCl}\\ (\mathrm{ii}){10}^{-3}\mathrm{M}\mathrm{NaCl}\\ (\mathrm{iii}){10}^{-2}\mathrm{M}\mathrm{NaCl}\\ (\mathrm{iv}){10}^{-4}\mathrm{M}\mathrm{Urea}\)

200 ml of 0.2 M NaOH is mixed with 400 ml of 0.5 M NaOH solution. Molarity of mixture is:

Proceess in non spontaneous at freezing point but spontaneous at boiling point, find ΔH and ΔS ?

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Helium is used to dilute oxygen in diving apparatus.
Reasons R : Helium has high solubility in \({\mathrm{O}}_{2}\).
In the light of the above statements, choose the correct answer from the options given below :

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Helium is used to dilute oxygen in diving apparatus.
Reasons R : Helium has high solubility in \({\mathrm{O}}_{2}\).
In the light of the above statements, choose the correct answer from the options given below

[NEET 2023]