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Day 91: JEE Mains Chemistry

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

  1. Question 1

    Solutions. This type asked 2 times: 14 Jun 2022, 21 Jan 2026 S2. This one: 21 Jan 2026 S2 See all 2 of this type

    47
    The osmotic pressure of a living cell in 12 atm at 300 K . The strength of sodium chloride solution that is isotonic with the living cell at this temperature is ____\_\_\_\_ gL−1gL^{- 1}. (Nearest integer) Given : R=0.08 L atm K−1 mol−1R = 0.08\text{ }L\text{ }atm{\text{ }K}^{- 1}{\text{ }mol}^{- 1} Assume complete dissociation of NaCl (Given : Molar mass of Na and Cl are 23 and 35.5 gmol−1g{mol}^{- 1} respectively.)

  2. Question 2

    Classification of Elements and Periodicity. This type asked 2 times: 22 Jan 2025, 21 Jan 2026 S1. This one: 21 Jan 2026 S1 See all 2 of this type

    27
    Which of the following represents the correct trend for the mentioned property? (A) F>P>S>B−F > P > S > B - First Ionization Energy (B) Cl>F>S>P−Cl > F > S > P - Electron Affinity (C) K>Al>Mg>B−K > Al > Mg > B - Metallic character (D) K2O>Na2O>MgO>Al2O3K_{2}O > {Na}_{2}O > MgO > {Al}_{2}O_{3} - Basic character Choose the correct answer from the option given below.

    Tap an option to check your answer.

  3. Question 3

    Classification of Elements and Periodicity. This type asked 2 times: 31 Jan 2024, 21 Jan 2026 S1. This one: 21 Jan 2026 S1 See all 2 of this type

    30
    Given below are two statements : Statement I: The number of pairs among [ SiO2,CO2{SiO}_{2},{CO}_{2} ], [SnO,SnO2],[PbO,PbO2]\left\lbrack SnO,{SnO}_{2} \right\rbrack,\left\lbrack PbO,{PbO}_{2} \right\rbrack and [GeO,GeO2]\left\lbrack GeO,{GeO}_{2} \right\rbrack, which contain oxides that are both amphoteric is 2 . Statement II : BF3{BF}_{3} is an electron deficient molecule can act as a lewis acid, forms adduct with NH3{NH}_{3} and has a trigonal planar geometry. In the light of the above statement, choose the correct answer from the option given below.

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  4. Question 4

    Some Basic Concepts of Chemistry. This type asked 2 times: 24 Jan 2023, 7 Apr 2025. This one: 7 Apr 2025 See all 2 of this type

    47
    Thyroxine, the hormone has given below structure The percentage of iodine in thyroxine is ____ %\%. (nearest integer) (Given molar mass in gmol−1C:12.H:1,O:16g{mol}^{- 1}C:12.H:1,O:16, N:14, I:127)

  5. Question 5

    Biomolecules. This type asked 2 times: 1 Feb 2024, 4 Apr 2025. This one: 4 Apr 2025 See all 2 of this type

    50
    The total number of hydrogen bonds of a DNA double helix whose one strand has the following sequence of bases is ____.
    5′−G−G−C−A−A−A−T−C−G−G−C−T−A−3′5'-G-G-C-A-A-A-T-C-G-G-C-T-A-3'