← CBSE Class 12 PYQ

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CBSE Class 12 · Chemistry · 29 past questions

19 of 29 · show all

Q1 2026

When 1.5 g of a non-volatile solute was dissolved in 90 g of benzene, the boiling point of benzene got raised…
Q2 2026

Which of the following solutions will have the lowest freezing point in water ?
Q4 2026

The boiling point of an azeotropic mixture of water and ethanol is less than that of pure water and ethanol.…
Q5 2026

The mole fraction of a solute in 2·0 molal aqueous solution is…
Q6 2026

An antifreeze solution is prepared by dissolving 31 g of ethylene glycol (Molar mass = 62 g mol$^{-1}$) in…
Q7 2025

The value of Henry's constant K$_H$ is…
Q10 2025

In case of association, abnormal molar mass of solute will
Q11 2025

An unripe mango placed in a concentrated salt solution to prepare pickle, shrivels because __________.
Q13 2024

An azeotropic solution of two liquids has boiling point lower than either of them when it…
Q14 2024

The relative lowering of vapour pressure of an aqueous solution containing non-volatile solute is 0.0225. The…
Q18 2024

For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other…
Q20 2024

For an electrolyte undergoing association in a solvent, the van't Hoff factor…
Q21 2024

For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other…
Q22 2023

Value of Henry's constant K$_H$…
Q23 2023

The vapour pressure of pure liquid X and pure liquid Y at 25 °C are 120 mm Hg and 160 mm Hg respectively. If…
Q25 2023

An azeotropic mixture of two liquids has a boiling point higher than either of the two liquids when it…
Q26 2023

Which of the following colligative property is used to find the molar mass of proteins ?
Q28 2023

The colligative property used for the determination of molar mass of polymers and proteins is…
Q29 2023

Low concentration of oxygen in the blood and tissues of people living at high altitude is due to…