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NEET • CHEMISTRY • SOLUTIONS

Solutions practice · Medium

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Showing 1-30 of 90 questions
1 Medium
1 of 90
Understanding +4 | -1
Consider the solution of ethanol. In it
View answer and explanation
Correct option: D
Both (1) and (2)
Option D (Both (1) and (2)) is correct because in a solution of ethanol, ethanol can be dissolved in water, and the components are in the same phase (liquid).
2 Medium
2 of 90
Application +4 | -1
0.2 molal aqueous solution of a monobasic acid is 60% ionised. If Kb for water is 0.52 K kg mol−10.52\,K\,kg\,mo{l^{ - 1}} then the boiling point of the solution will be
View answer and explanation
Correct option: B
100.170C{100.17^0}C
Option B (100.170C{100.17^0}C) is correct because it is the calculated boiling point elevation considering the ionization of the monobasic acid.
3 Medium
3 of 90
Application +4 | -1
What is molecular weight of a substance whose 7.0% by mass solution in water freezes at −−0.930C--{0.93^0}C. Kf{K_f} for water is 1.86Kkgmol−11.86\mathrm{ }K\mathrm{ }kg\mathrm{ }mo{l^{ - 1}}
View answer and explanation
Correct option: B
150 .5 g mol−1150\,.5\,g\,mo{l^{ - 1}}
Option B (150.5 .5 g mol−1150.5\,.5\,g\,mo{l^{ - 1}}) is correct because it is calculated using the freezing point depression formula and the given percentage by mass.
4 Medium
4 of 90
Application +4 | -1
Molecular weight of glucose is 180. A solution of glucose which contains 18 g/L, is
View answer and explanation
Correct option: A
0.1 molal
Option A (0.1 molal) is correct because it is the molality calculated from the given mass of glucose per liter of solution, approximating the density of the solution as 1 g/mL.
5 Medium
5 of 90
Understanding +4 | -1
Molal elevation constant of a liquid is :
View answer and explanation
Correct option: C
Elevation in b.p. which would be produced by dissolving 1 mole of solute in 1000 g of solvent
Option C (Elevation in b.p. which would be produced by dissolving 1 mole of solute in 1000 g of solvent) is correct because molal elevation constant is defined for 1 mole of solute in 1000g (1 kg) of solvent.
6 Medium
6 of 90
Understanding +4 | -1
Read the following statements and choose the correct option.

(i) Polar solutes dissolve in a polar solvent.

(ii) Polar solutes dissolve in a non-polar solvent.

(iii) Non-polar solutes dissolve in a non-polar solvent.

(iv) Non-polar solutes dissolve in a polar solvent.
View answer and explanation
Correct option: C
(i) and (iii) are correct.
Option C ((i) and (iii) are correct) is correct because polar solutes dissolve in polar solvents, and non-polar solutes dissolve in non-polar solvents.
7 Medium
7 of 90
Understanding +4 | -1
A super saturated solution is a metastable state of solution in which solute concentration.
View answer and explanation
Correct option: B
Exceeds than its solubility
Option B (Exceeds than its solubility) is correct because a supersaturated solution contains more solute than the solvent can normally dissolve at that temperature.
8 Medium
8 of 90
Remembering +4 | -1
The mixture of two liquids boils without changing its composition is called
View answer and explanation
Correct option: C
Azeotropic liquid mixture
Option C (Azeotropic liquid mixture) is correct because azeotropes are mixtures that boil at a constant temperature without changing composition.
9 Medium
9 of 90
Application +4 | -1
If for a sucrose solution elevation in boiling point is 0.1∘C0.1^\circ C then what will be boiling point ofNaCl\mathrm{NaCl} solution for the same molal concentration?
View answer and explanation
Correct option: B
0.20.2
Option B is correct because NaCl dissociates into two ions, doubling the effect on boiling point elevation compared to sucrose, which does not dissociate.
10 Medium
10 of 90
Remembering +4 | -1
Azeotropic mixture of HCl\mathrm{HCl} and H2O\mathrm{H}_2 \mathrm{O} has
View answer and explanation
Correct option: D
20.2% HCl20.2 \% \mathrm{~HCl}
Option D (20.2 % HCl\mathrm{HCl}) is correct because that is the approximate composition of the azeotropic mixture of HCl and water.
11 Medium
11 of 90
Understanding +4 | -1
Which of the following colligative property is used to determine molar masses of proteins ?
View answer and explanation
Correct option: D
Osmotic pressure
Osmotic pressure is the colligative property most commonly used to determine the molar masses of proteins due to the large molar masses of proteins resulting in measurable osmotic pressure, making option D the correct answer.
12 Medium
12 of 90
Remembering +4 | -1
The pressure under which liquid and its vapour can coexist in equilibrium is known as:
View answer and explanation
Correct option: B
Saturated vapour pressure
Option B (Saturated vapour pressure) is correct because it defines the pressure at which a liquid and its vapor coexist in equilibrium.
13 Medium
13 of 90
Analyzing +4 | -1
If 0.1  M0.1\;M solutions of each electrolyte are taken and if all electrolytes are completely dissociated, then whose boiling point will be highest ?
View answer and explanation
Correct option: D
K2[Fe(CN)6]{\mathrm{K}_2}\left[ {\mathrm{Fe}{{\left( {\mathrm{CN}} \right)}_6}} \right]
Option D (K2[Fe(CN)6]{\mathrm{K}_2}\left[ {\mathrm{Fe}{{\left( {\mathrm{CN}} \right)}_6}} \right]) is correct because it dissociates into the highest number of ions, leading to the greatest elevation in boiling point.
14 Medium
14 of 90
Remembering +4 | -1
What is the composition of gases in the tanks used by the scuba divers?
View answer and explanation
Correct option: B
11.7%11.7 \% helium 56.2%56.2 \% nitrogen 32.1%32.1 \% oxygen
Option B (11.7%11.7 \% helium 56.2%56.2 \% nitrogen 32.1%32.1 \% oxygen) is the correct composition of gases in scuba diving tanks, balancing oxygen needs and nitrogen narcosis risks.
15 Medium
15 of 90
Application +4 | -1
40% by weight solution will contain how much mass of the solute in 1L solution, density of the solution is 1.2 g/mL?
View answer and explanation
Correct option: A
480 g
Option A (480 g) is correct because it is the mass of solute calculated from the given weight percentage and density of the solution.

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16 Medium
16 of 90
Understanding +4 | -1
Which one of the statements given below concerning properties of solutions, describes a colligative effect?
View answer and explanation
Correct option: A
Vapour pressure of pure water decreases by the addition of nitric acid
Option D (Vapour pressure of pure benzene decreases by the addition of naphthalene) is correct because the lowering of vapor pressure is a colligative property, depending on the number of solute particles (naphthalene) added.
17 Medium
17 of 90
Application +4 | -1
The molarity of 1% (w/w) HCl solution having density 0.365 g/ml is
View answer and explanation
Correct option: B
0.1 M
Option B (0.1 M) is correct because it is the molarity calculated from the given weight percentage and density of the HCl solution.
18 Medium
18 of 90
Analyzing +4 | -1
5% (wt./vol.) aqueous NaCl solution and 5% (wt./vol.) aqueous KCl solution are :
View answer and explanation
Correct option: D
None of these
Option D (None of these) is correct because isotonic solutions must have the same osmotic pressure, which is not the case here due to different molar masses.
19 Medium
19 of 90
Analyzing +4 | -1
Assertion (A) : For rubber and water, V(l) >> V(s)

Reason (R) : The density of both rubber and water is more in liquid state
View answer and explanation
Correct option: C
Both Assertion and Reason are correct and Reason is correct explantion of Assertion
Option C (Both Assertion and Reason are correct and Reason is correct explantion of Assertion) is correct because both the assertion and the reason are true, and the reason correctly explains why the assertion is true.
20 Medium
20 of 90
Application +4 | -1
What amount of water is added in 40  mL40\;\mathrm{ }mL of NaOH  (0.1  N)NaOH\;(0.1\;N) which is neutralised by 50 mL of HCl  (0.2  N)HCl\;(0.2\;N)?
View answer and explanation
Correct option: B
60 mL
Option B (60 mL) is correct because it is the amount of water added to dilute the NaOH solution, calculated using the neutralization reaction and the dilution formula.
21 Medium
21 of 90
Analyzing +4 | -1
Solution A contains 7 g/L of MgCl2MgC{l_2} and solution B contains 7 g/L of NaClNaCl. At room temperature, the osmotic pressure of
View answer and explanation
Correct option: C
Solution B is greater than A
Option C (Solution B is greater than A) is correct because NaCl has a higher molar concentration of ions compared to MgCl2 at the same mass concentration.
22 Medium
22 of 90
Application +4 | -1
If α\alpha is the degree of dissociation of Na2SO4N{a_2}S{O_4} the van’t Hoff factor (i) used for calculating the molecular mass is
View answer and explanation
Correct option: B
1+2α1 + 2\alpha
Option B (1+2α1 + 2\alpha) is correct because Na2SO4 dissociates into 3 ions, and the van't Hoff factor is calculated accordingly.
23 Medium
23 of 90
Remembering +4 | -1
Ebullioscopy is concerned with
View answer and explanation
Correct option: B
Elevation of boiling point of a solution
Option B (Elevation of boiling point of a solution) is correct because ebullioscopy is the study of the elevation of the boiling point of a solution.
24 Medium
24 of 90
Application +4 | -1
What weight of 70% (w/w) HNO3HN{O_3} is required to prepare 250 ml of 2 molar aqueous HNO3HN{O_3}?
View answer and explanation
Correct option: B
45 g
Option B (45 g) is correct because it is the mass of 70% HNO3 required to prepare the given solution, calculated using the molarity formula.
25 Medium
25 of 90
Understanding +4 | -1
At constant temperature on increasing pressure which is correct
View answer and explanation
Correct option: D
Solubility of gas in liquid increases
Option D (Solubility of gas in liquid increases) is correct because, according to Henry's Law, increasing pressure at constant temperature increases the solubility of a gas in a liquid.
26 Medium
26 of 90
Application +4 | -1
The increase in boiling point of a solution containing 0.6 g urea in 200 g water is 0.50∘C0.50^\circ \mathrm{C} .Find the molal elevation constant.
View answer and explanation
Correct option: A
10  K  kg  mol−110\;K\;kg\;mo{l^{ - 1}}
Option A (10  K  kg  mol−110\;K\;kg\;mo{l^{ - 1}}) is correct because it is the molal elevation constant calculated using the formula for elevation in boiling point.
27 Medium
27 of 90
Analyzing +4 | -1
Assertion: The molarity and normality of a solution of sodium carbonate are same.
Reason: Molarity is the product of normality & valency factor.
View answer and explanation
Correct option: D
If both Assertion & Reason are false
Option D is correct because both the assertion and the reason are false. The molarity and normality of sodium carbonate are not the same, and molarity is not the product of normality and valency factor; rather, normality is the product of molarity and valency factor.
28 Medium
28 of 90
Remembering +4 | -1
Isotonic solutions are solutions having the same
View answer and explanation
Correct option: C
Osmotic pressure
Option C (Osmotic pressure) is correct because isotonic solutions, by definition, have the same osmotic pressure.
29 Medium
29 of 90
Application +4 | -1
The relative lowering of vapour pressure produced by dissolving 71.5 g of a substance in 1000 g of water is 0.00713. The molecular weight of the substance will be :
View answer and explanation
Correct option: A
180
Option A (180) is correct because it is calculated using the relative lowering of vapor pressure formula.
30 Medium
30 of 90
Understanding +4 | -1
On mixing 10 ml10\,ml of acetone with 40 ml40\,ml of chloroform, the total volume of the solution is
View answer and explanation
Correct option: B
> 50 ml> \,50\,ml
Option B (>50ml> 50 ml) is correct because mixing acetone and chloroform results in positive deviations from Raoult's law, leading to an increase in volume.
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