PYQ Vault
EbooksTutor

Day 239: JEE Mains Chemistry

5 questions. Try each one first, then open its answer.

  1. Question 1

    Solutions. Asked once: 21 Jan 2026 S2 (same type asked 4 times) See all 4 of this type

    48
    A substance ' X ' ( 1.5 g ) dissolved in 150 g of a solvent ' Y ' (molar mass =300 g mol−1= 300\text{ }g{\text{ }mol}^{- 1} ) led to an elevation of the boiling point by 0.5 K . The relative lowering in the vapour pressure of the solvent ' Y ' is ____\_\_\_\_ ×10−2\times 10^{- 2}. (Nearest integer) [Given : KbK_{b} of the solvent =5.0 K kg mol−1= 5.0\text{ }K\text{ }kg{\text{ }mol}^{- 1} ] Assume the solution to be dilute and no association or dissociation of X takes place in solution.

  2. Question 2

    The p-Block Elements. Asked once: 9 Apr 2024 (same type asked 4 times) See all 4 of this type

    41
    Given below are two statements: one is labelled as Assertion (A) : and the other is labelled as Reason (R). Assertion (A): Both rhombic and monoclinic sulphur exist as S8S_{8} while oxygen exists as O2O_{2}. Reason (R): Oxygen forms pπp\pi-p π\pi multiple bonds with itself and other elements having small size and high electronegativity like CC, NN, which is not possible for sulphur. In the light of the above statements, choose the most appropriate answer from the options given below:

    Tap an option to check your answer.

  3. Question 3

    Equilibrium. Asked once: 23 Jan 2025 (same type asked 4 times) See all 4 of this type

    46
    If 1 mM solution of ethylamine produces pH=9pH = 9, then the ionization constant (Kb)\left( K_{b} \right) of ethylamine is 10−x10^{- x}. The value of xx is _____\_\_\_\_\_ (nearest integer). [The degree of ionization of ethylamine can be neglected with respect to unity.]

  4. Question 4

    Hydrocarbons. Asked once: 24 Jan 2023 (same type asked 4 times) See all 4 of this type

    148
    Maximum number of isomeric monochloro derivatives which can be obtained from 2, 2, 5, 5 tetramethyl hexane by chlorination is___

  5. Question 5

    The p-Block Elements. Asked once: 13 Apr 2023 (same type asked 4 times) See all 4 of this type

    134
    The correct group of halide ions which can be oxidised by oxygen in acidic medium is

    Tap an option to check your answer.