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Day 325: JEE Mains Chemistry

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

  1. Question 1

    The p-Block Elements. Asked once: 30 Jan 2024 (same type asked 7 times) See all 7 of this type

    139
    Choose the correct statements about the hydrides of group 15 elements. (A) The stability of the hydrides decreases in the order NH3>PH3>AsH3>SbH3>BiH3NH_{3}>PH_{3}>AsH_{3}>SbH_{3}>BiH_{3} (B) The reducing ability of the hydrides increases in the order NH3<PH3<AsH3<SbH3<BiH3NH_{3}<PH_{3}<AsH_{3}<SbH_{3}<BiH_{3} (C) Among the hydrides, NH3NH_{3} is strong reducing agent while BiH3BiH_{3} is mild reducing agent. (D) The basicity of the hydrides increases in the order NH3<PH3<AsH3<SbH3<BiH3NH_{3}<PH_{3}<AsH_{3}<SbH_{3}<BiH_{3} Choose the most appropriate from the option given below:

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  2. Question 2

    Structure of Atom. Asked once: 29 Jan 2023 (same type asked 7 times) See all 7 of this type

    141
    Assume that the radius of the first Bohr orbit of hydrogen atom is 0.6Å0.6\text{Å}. The radius of the third Bohr orbit of He+He^{+}is ____picometer. (Nearest Integer)

  3. Question 3

    Chemical Kinetics. Asked once: 30 Jan 2023 (same type asked 7 times) See all 7 of this type

    147
    An organic compound undergoes first order decomposition. If the time taken for the 60%60\% decomposition is 40 s40\text{ }s, then the time required for 90%90\% decomposition will be is___ s. (Nearest integer). Given: ln⁡10=2.3;log⁡2=0.3\ln10 = 2.3;\log2 = 0.3

  4. Question 4

    Solutions. Asked once: 11 Apr 2023 (same type asked 7 times) See all 7 of this type

    137
    What weight of glucose must be dissolved in 100 g100\text{ }g of water to lower the vapour pressure by 0.20 mm0.20\text{ }mm HgHg ? (Assume dilute solution is being formed) Given: Vapour pressure of pure water is 54.2 mm54.2\text{ }mm HgHg at room temperature. Molar mass of glucose is 180 g mol−1180\text{ }g{\text{ }mol}^{- 1}.

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  5. Question 5

    Chemical Thermodynamics. Asked once: 25 Jun 2022 (same type asked 7 times) See all 7 of this type

    122
    At 25∘C25^{\circ}C and 1 atm pressure, the enthalpy of combustion of benzene (l) and acetylene (g) are −3268 kJ mol−1- 3268\text{ }kJ{\text{ }mol}^{- 1} and −1300 kJ mol−1- 1300\text{ }kJ{\text{ }mol}^{- 1}, respectively. The change in enthalpy for the reaction 3C2H2( g)→C6H6(l)3C_{2}H_{2}(\text{ }g) \rightarrow C_{6}H_{6}(l), is

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