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Day 18: JEE Mains Chemistry

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

  1. Question 1

    The p-Block Elements. This type asked 5 times: 6 Apr 2024, 29 Jan 2025, 7 Apr 2025, 4 Apr 2026 S2, 6 Apr 2026 S1. This one: 6 Apr 2026 S1 See all 5 of this type

    34
    Given below are two statements : Statement-I : Aluminum is more electropositive than thallium as the standard electrode potential value of EAl3+/AloE_{{Al}^{3 +}/Al}^{o} is negative and ETl3+/TloE_{{Tl}^{3 +}/Tl}^{o} is positive. Statement-II : The sum of first three ionization enthalpies of boron is very high when compared to that of aluminum. Due to this reason boron forms covalent compounds only and aluminium forms Al3+{Al}^{3 +} ion. In the light of the above statements, choose the correct answer from the options given below.

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  2. Question 2

    Classification of Elements and Periodicity. This type asked 5 times: 2021 Paper 16, 2021 Paper 26, 28 Jun 2022, 2 Apr 2026 S2, 5 Apr 2026 S2. This one: 5 Apr 2026 S2 See all 5 of this type

    33
    Given below are two statements : Statement-I : The number of pairs among [Al2O3\left\lbrack {Al}_{2}O_{3} \right.,  Cr2O3],[Cl2O7,Mn2O7],[Na2O,V2O3]\left. \ {Cr}_{2}O_{3} \right\rbrack,\left\lbrack {Cl}_{2}O_{7},{Mn}_{2}O_{7} \right\rbrack,\left\lbrack {Na}_{2}O,V_{2}O_{3} \right\rbrack and [CO\lbrack CO,  N2O]\left. \ N_{2}O \right\rbrack that contain oxides of same nature (acidic, basic, neutral or amphoteric) is 4. Statement-II : Among Na2O,Al2O3,CO{Na}_{2}O,{Al}_{2}O_{3},CO and Cl2O7{Cl}_{2}O_{7}, the most basic and acidic oxides are Na2O{Na}_{2}O and Cl2O7{Cl}_{2}O_{7}, respectively. In the light of the above statements, choose the correct answer from the options given below:

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  3. Question 3

    Electrochemistry. This type asked 5 times: 2021 Paper 21, 29 Jul 2022, 31 Jan 2023, 2 Apr 2025, 5 Apr 2026 S2. This one: 5 Apr 2026 S2 See all 5 of this type

    49
    At 298 K , the molar conductivity of x%(w/w)x\%(w/w) MX solution (aqueous) is 123.5 S cm2 mol−1123.5\text{ }S{\text{ }cm}^{2}{\text{ }mol}^{- 1}. The conductance of same solution is 1.9×10−3 S1.9 \times 10^{- 3}\text{ }S. The value of xx is ____\_\_\_\_ ×10−2\times 10^{- 2}. (Given : cell constant =1.3 cm−1= 1.3{\text{ }cm}^{- 1}; molar mass of MX is 75 g mol−175\text{ }g{\text{ }mol}^{- 1}, density of aqueous solution of MX at 298 K is 1.0 g mL−11.0\text{ }g{\text{ }mL}^{- 1} )

  4. Question 4

    Solutions. This type asked 5 times: 28 Jun 2022, 31 Jan 2023, 10 Apr 2023, 13 Apr 2023, 5 Apr 2026 S2. This one: 5 Apr 2026 S2 See all 5 of this type

    48
    20 g hemoglobin in a 1 L aqueous solution (A) at 300 K is separated from pure water by semi permeable membrane. At equilibrium the height of solution in a tube dipped in a solution (A) is found to be 80.0 mm higher than the tube dipped in water. The molar mass of hemoglobin is ____\_\_\_\_ kgmol−1kg{mol}^{- 1}.(Nearest integer) (Given : g=10 ms−2,R=8.3kPadm3 K−1 mol−1g = 10{\text{ }ms}^{- 2},R = 8.3kPa{dm}^{3}{\text{ }K}^{- 1}{\text{ }mol}^{- 1}, density of solution =1000 kg m−3= 1000\text{ }kg{\text{ }m}^{- 3} )

  5. Question 5

    Equilibrium. This type asked 5 times: 2021 Paper 22, 1 Feb 2024, 22 Jan 2025, 2 Apr 2026 S1, 5 Apr 2026 S1. This one: 5 Apr 2026 S1 See all 5 of this type

    30
    M3 A2M_{3}{\text{ }A}_{2} is a sparingly soluble salt of molar mass y gmol−1gmol^{- 1} and solubility x gL−1x\ gL^{- 1}. The ratio of the molar concentration of the anion ( A3−A^{3 -} ) to the solubility product of the salt is

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