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Day 33: JEE Mains Chemistry

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

  1. Question 1

    Solutions. This type asked 4 times: 4 Apr 2024, 21 Jan 2026 S2, 24 Jan 2026 S1, 4 Apr 2026 S1. This one: 4 Apr 2026 S1 See all 4 of this type

    50
    A non-volatile, non-electrolyte solid solute when dissolved in 40 g of a solvent, the vapor pressure of the solvent decreased from 760 mm Hg to 750 mm Hg . If the same solution boils at 320 K , then the number of moles of the solvent present in the solution is ____\_\_\_\_ . (Nearest integer) [Given : boiling point of the pure solvent =319.5 K, Kb= 319.5\text{ }K,{\text{ }K}_{b} of the solvent =0.3 K kg mol−1= 0.3\text{ }K\text{ }kg{\text{ }mol}^{- 1} ]

  2. Question 2

    The p-Block Elements. This type asked 4 times: 29 Jan 2024, 9 Apr 2024, 24 Jan 2025, 4 Apr 2026 S1. This one: 4 Apr 2026 S1 See all 4 of this type

    34
    Given below are two statements : Statement I : The covalency of oxygen is generally two but it can exceed upto four. The oxidation state of oxygen in SO2{SO}_{2} is -2 and in OF2{OF}_{2} it is +2 . Statement II: The anomalous behavior of oxygen when compared to the other elements of group 16 is due to its small size and high electronegativity . In the light of the above statements, choose the correct answer from the options given below:

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  3. Question 3

    Equilibrium. This type asked 4 times: 28 Jul 2022, 23 Jan 2025, 28 Jan 2026 S1, 2 Apr 2026 S2. This one: 2 Apr 2026 S2 See all 4 of this type

    31
    At 25∘C,20.0 mL25^{\circ}C,20.0\text{ }mL of 0.2 M weak monoprotic acid HX is titrated against 0.2 M NaOH . The pH of the solution (a) at the start of the titration (when NaOH has not been added) and (b) when 10 mL of NaOH is added respectively, are : Given : Ka=5×10−4,pKa=3.3,α≪1K_{a}= 5 \times10^{- 4},pK_{a}= 3.3,\alpha\ll 1

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  4. Question 4

    Hydrocarbons. This type asked 4 times: 25 Jul 2022, 24 Jan 2023, 31 Jan 2024, 2 Apr 2026 S1. This one: 2 Apr 2026 S1 See all 4 of this type

    47
    Consider the isomers of hydrocarbon with molecular formula C5H10C_{5}H_{10}. These isomers do not decolourise KMnO4{KMnO}_{4} solution. These isomers are subjected to chlorination with chlorine in presence of light to give monochloro compounds. The total number of monochloro compounds (structural isomers only) formed is ____\_\_\_\_ .

  5. Question 5

    The p-Block Elements. This type asked 4 times: 8 Apr 2023, 13 Apr 2023, 30 Jan 2024, 2 Apr 2026 S1. This one: 2 Apr 2026 S1 See all 4 of this type

    35
    Given below are two statements : Statement (I) : Oxidising power of halogens decreases in the order F2>Cl2>Br2>I2F_{2} > {Cl}_{2} > {Br}_{2} > I_{2}, which is the basis of "Layer test". Statement (II): "Layer test" to identify Br2{Br}_{2} and I2I_{2} in aqueous solution involves the oxidation of bromide or iodide into Br2{Br}_{2} or I2I_{2} respectively with Cl2{Cl}_{2}, which is a type of displacement redox reaction. In the light of the above statements, choose the correct answer from the options given below :

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