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Day 330: JEE Mains Chemistry

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

  1. Question 1

    Solutions. Asked once: 29 Jun 2022 (same type asked 6 times) See all 6 of this type

    53
     1.2 mL\ 1.2\text{ }mL of acetic acid is dissolved in water to make 2.0 L2.0\text{ }L of solution. The depression in freezing point observed for this strength of acid is 0.0198∘C0.0198^{\circ}C. The percentage of dissociation of the acid is (Nearest integer) [Given: Density of acetic acid is 1.02 g mL−11.02\text{ }g{\text{ }mL}^{- 1} Molar mass of acetic acid is 60 g mol−160\text{ }g{\text{ }mol}^{- 1}  Kf(H2O)=1.85 K kg mol−1]\left. \ K_{f}\left( H_{2}O \right)= 1.85\text{ }K\text{ }kg{\text{ }mol}^{- 1} \right\rbrack

  2. Question 2

    Structure of Atom. Asked once: 10 Apr 2023 (same type asked 6 times) See all 6 of this type

    148
    The electron in the nth n^{\text{th~}} orbit of Li2+Li^{2 +} is excited to (n+1)(n + 1) orbit using the radiation of energy 1.47×10−17 J1.47 \times10^{- 17}\text{ }J (as shown in the diagram). The value of nn is__ Given RH=2.18×10−18 JR_{H}= 2.18 \times10^{- 18}\text{ }J

  3. Question 3

    The d- and f-Block Elements. Asked once: 25 Jan 2023 (same type asked 6 times) See all 6 of this type

    125
    Potassium dichromate acts as a strong oxidizing agent in acidic solution. During this process, the oxidation state changes from

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  4. Question 4

    Equilibrium. Asked once: 26 Jul 2022 (same type asked 6 times) See all 6 of this type

    123
    Class XII students were asked to prepare one litre of buffer solution of pH8.26pH8.26 by their chemistry teacher. The amount of ammonium chloride to be dissolved by the student in 0.2M0.2M ammonia solution to make one litre of the buffer is (Given pKb(NH3)=4.74pK_{b}\left( NH_{3} \right)= 4.74; Molar mass of NH3=17 g mol−1NH_{3}= 17\text{ }g{\text{ }mol}^{- 1}; Molar mass of NH4Cl=53.5 g mol−1NH_{4}Cl = 53.5\text{ }g{\text{ }mol}^{- 1} )

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  5. Question 5

    Aldehydes, Ketones and Carboxylic Acids. Asked once: 9 Apr 2024 (same type asked 6 times) See all 6 of this type

    131
    Which of the following compound can give positive iodoform test when treated with aqueous KOHKOH solution followed by potassium hypoiodite?

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