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Day 155: JEE Mains Chemistry

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

  1. Question 1

    Some Basic Concepts of Chemistry. Asked once: 28 Jun 2022 (same type asked 4 times) See all 4 of this type

    141
     100 g\ 100\text{ }g of an ideal gas is kept in a cylinder of 416 L416\text{ }L volume at 27∘C27^{\circ}C under 1.5 bar pressure. The molar mass of the gas is gmol−1gmol^{- 1}. (Nearest integer) (Given: R=0.083 L bar K−1 mol−1R = 0.083\text{ }L\text{ }bar\text{ }K^{- 1}\text{ }mol^{- 1})

  2. Question 2

    Solutions. Asked once: 2021 Paper 26 (same type asked 4 times) See all 4 of this type

    57
    When 12.2 g12.2\text{ }g of benzoic acid is dissolved in 100 g100\text{ }g of water, the freezing point of solution was found to be −0.93∘C(Kf(H2O)=1.86 K kg mol−1)-0.93^{\circ}C\left( K_{f}\left( H_{2}O \right)= 1.86\text{ }K\text{ }kg{\text{ }mol}^{- 1} \right). The number (n)(n) of benzoic acid molecules associated (assuming 100%100\% association) is

  3. Question 3

    Aldehydes, Ketones and Carboxylic Acids. Asked once: 6 Apr 2026 S2 (same type asked 3 times) See all 3 of this type

    39
    ' x ' is the product which is obtained by the hydrolysis of prop-1-yne in the presence of mercuric sulphate under dilute acidic medium at 333 K . ' y ' is the product which is obtained by the reaction of ethane nitrile with methyl magnesium bromide in dry ether followed by hydrolysis. IUPAC name of product obtained from ' x ' and ' y ' in the presence of barium hydroxide followed by heating is:

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  4. Question 4

    Equilibrium. Asked once: 2021 Paper 21 (same type asked 3 times) See all 3 of this type

    58
    When 5.1 g5.1\text{ }g of solid NH4HSNH_{4}HS is introduced into a two litre evacuated flask at 27∘C,20%27^{\circ}C,20\% of the solid decomposes into gaseous ammonia and hydrogen sulphide. The KpK_{p} for the reaction at 27∘C27^{\circ}C is x×10−2x \times10^{- 2}. The value of xx is ____\_\_\_\_. (Integer answer) [Given R=0.082 L atm K−1 mol−1R = 0.082\text{ }L\text{ }atm{\text{ }K}^{- 1}{\text{ }mol}^{- 1} ]

  5. Question 5

    Haloalkanes and Haloarenes. Asked once: 31 Jan 2023 (same type asked 3 times) See all 3 of this type

    46
    The correct order of melting points of dichlorobenzenes is

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