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Day 293: JEE Mains Chemistry

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

  1. Question 1

    Solutions. Asked once: 31 Jan 2023 (same type asked 5 times) See all 5 of this type

    60
    At 27∘C27^{\circ}C, a solution containing 2.5 g2.5\text{ }g of solute in 250.0 mL250.0\text{ }mL of solution exerts an osmotic pressure of 400 Pa400\text{ }Pa. The molar mass of the solute is ____ g mol−1g\text{ }mol^{- 1} (Nearest integer) (Given: R=0.083 LbarK−1 mol−1R = 0.083{\text{ }L}_{bar}K^{- 1}{\text{ }mol}^{- 1} )

  2. Question 2

    The d- and f-Block Elements. Asked once: 31 Jan 2023 (same type asked 5 times) See all 5 of this type

    139
    Which of the following elements have half-filled f-orbitals in their ground state? (Given: atomic number Sm=62;Eu=63;Tb=65;Gd=64,Pm=61Sm = 62;Eu = 63;Tb = 65;Gd = 64,Pm = 61 ) A. SmSm B. Eu C. Tb D. Gd E. Pm Choose the correct answer from the options given below:

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  3. Question 3

    The d- and f-Block Elements. Asked once: 2021 Paper 23 (same type asked 5 times) See all 5 of this type

    46
    Match List-I with List-II: List-I LIST-II (Metal Ion) (Group in Qualitative analysis) (A) Mn2+Mn^{2 +} (i) Group - III (B) As3+As^{3 +} (ii) Group - IIA (C) Cu2+Cu^{2 +} (iii) Group - IV (D) Al3+Al^{3 +} (iv) Group - IIB Choose the most appropriate answer from the options given below:

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  4. Question 4

    Chemical Bonding and Molecular Structure. Asked once: 10 Apr 2023 (same type asked 5 times) See all 5 of this type

    144
    The number of molecules from the following which contain only two lone pair of electrons is___ H2O,N2,CO,XeF4,NH3,NO,CO2, F2H_{2}O,N_{2},CO,XeF_{4},NH_{3},NO,CO_{2},{\text{ }F}_{2}

  5. Question 5

    Structure of Atom. Asked once: 2021 Paper 23 (same type asked 5 times) See all 5 of this type

    53
    The value of magnetic quantum number of the outermost electron of Zn+Zn^{+}ion is