Blog Log in Get Started Free

Chemistry MCQs for NEET — Practice Questions with Answers

Practice free Chemistry NEET multiple-choice questions online with instant answers and detailed explanations. No login required.

All Physics Chemistry Botany Zoology

Chapter Language Difficulty Show only questions I answered incorrectly Register free to filter questions

● ● ● ● ●

According to Boyle-vanâ€™t - Hoff law at a constant temperature, osmotic pressure of a solution is directly proportional to its molarity. It means $ \pi \alpha C where C = molarity of solution \therefore \pi = Kc Then calculate the value of k in SI unit at 24 ^\circ c temperature. (R = 8. 314 J/mole k) $

A. 24.942 J/mol B. 2494.2 J/mol C. 0.024942 J/mol D. 2.4942 J/mol

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

According to the Boyle-van't Hoff law, the osmotic pressure (Ï€) is directly proportional to the molarity (C) of the solution at a constant temperature. The constant of proportionality is represented by k, known as the van't Hoff factor. The value of k can be calculated using the gas constant (R) and the absolute temperature (T). k = RT, where R = 8.314 J/molÂ·K and T = 24Â°C + 273.15 = 297.15 K. Substituting the values, k = (8.314 J/molÂ·K) Ã— (297.15 K) = 2494.2 J/mol.

● ● ● ● ●

Boiling point of an aqueous solution of urea at one bar pressure is 373.41 k. Then at a constant temperature, calculate the percentage decrease in vapoure pressure of a solution compared to $ (k_b = 0.512 k.kg. mol ^{-1}) $

A. 1.42% B. 2.56% C. 4.17% D. 3.44%

You've reached today's free limit of 20 questions. Log in to keep practising for free.

● ● ● ● ●

Calculate $ P^H of a solution prepared by mixing equal volume of an aqueous solution of HCI having P^H = 2 and P^H = 5 at 298 k temp $ .

A. 3.5 B. 3 C. 7 D. 2.3

You've reached today's free limit of 20 questions. Log in to keep practising for free.

● ● ● ● ●

Which of the following is the correct formula for Rqoultâ€™s law when non-volatile solute is mixed with liquid solvent. where n=mole traction of solute N= mok fraction of solvent, P= vapour pressure of solution Po = vapour pressure of pure solvent and ïP=Decrease in vapour pressure

A. $ { \triangle p \over p } = { n \over N } $ B. $ { \triangle p \over p^\circ } = { n \over N } $ C. $ { \triangle p \over p } = { n \over n + N } $ D. $ { \triangle p \over p } = { n \over n + N } $

You've reached today's free limit of 20 questions. Log in to keep practising for free.

● ● ● ● ●

Which of the following is correct option when kcl is dissolved in $ H_20 $ .?

A. $ \triangle H = +ve, \triangle S = +ve, \triangle G = +ve $ B. $ \triangle H = +ve, \triangle S = â€“ve, \triangle G = â€“ve $ C. $ \triangle H = +ve, \triangle S = +ve, \triangle G = â€“ve $ D. $ \triangle H = â€“ve, \triangle S = â€“ve, \triangle G = +ve $

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

When KCl (an ionic solid) dissolves in water, the lattice enthalpy is overcome, which is an endothermic process (Î”H is positive). The ions become disordered in solution, increasing entropy (Î”S is positive). The overall process is spontaneous, so Î”G is negative.

● ● ● ● ●

Naphthalene is soluble in ether orbenzene because. ?

A. dipole-dipole attraction is equal B. London forces are equal C. Hydrogen bond D. Ionic attraction

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

Naphthalene is soluble in ether or benzene due to London dispersion forces (induced dipole-induced dipole attractions) between the non-polar solute and non-polar solvents. The strength of these intermolecular forces determines the solubility.

● ● ● ● ●

Which of the following is applicable for the solubility of gases in liquid

A. Increases with increase in temperature and pressure. B. decreases with increase in temp and pressure. C. Increases with decrease in temp and increase in pressure. D. Decreases with decrease in temp and increase in pressure.

You've reached today's free limit of 20 questions. Log in to keep practising for free.

● ● ● ● ●

Concentration of lead metal in a blood of any person is more than that of 10microgram. $ dm^{-1} $ , than that person is considered as on effect of poision sectrion. Then calculate its concentration in ppb (parts per billion)

A. 1 B. 10 C. 100 D. 1000

You've reached today's free limit of 20 questions. Log in to keep practising for free.

● ● ● ● ●

The ratio of $ { RT \over \pi } of 6 \% w/v and 9 \% w/v $ is one for both. what would be the value of atomic weight of A and Brespectively. $ (AB_2 and A_2B are electrolytes) $

A. 60, 90 B. 40, 40 C. 40, 10 D. 10, 40

You've reached today's free limit of 20 questions. Log in to keep practising for free.

● ● ● ● ●

Decrease in vapour pressure of an aqueous soln. of an electrolyte is 4% what would be the percentage increase in elevation in Boiling point ? $ (k_b = 0.512 k. kg. mol^{-1}) $

A. 0.55% B. 0.02% C. 5.50% D. 2%

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Ready to ace NEET?

Free access · No credit card required

Browse All Questions Create Free Account

Frequently Asked Questions

Yes. You can attempt every Chemistry question on this page for free without logging in, and check the correct answer with a detailed explanation instantly.

No account is required to attempt questions and view answers. A free account adds bookmarks, personal notes, and progress tracking.

The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.