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Day 213: JEE Mains Chemistry

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

  1. Question 1

    Some Basic Concepts of Chemistry. Asked once: 21 Jan 2026 S2 (same type asked 8 times) See all 8 of this type

    29
    Aqueous HCl reacts with MnO2(s)MnO_{2}(s) to form MnCl2(aq)MnCl_{2}(aq), Cl2(g)Cl_{2}(g) and H2O(l)H_{2}O(l). What is the weight (in g) of Cl2Cl_{2} liberated when 8.7 g of MnO2(s)MnO_{2}(s) is reacted with excess aqueous HCl solution ? (Given Molar mass in gmol−1Mn=55,Cl=35.5,O=16,H=1gmol^{- 1}Mn = 55,Cl = 35.5,O = 16,H = 1)

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  2. Question 2

    Some Basic Concepts of Chemistry. Asked once: 4 Apr 2024 (same type asked 8 times) See all 8 of this type

    55
    Only 2 mL2\text{ }mL of KMnO4KMnO_{4} solution of unknown molarity is required to reach the end point of a titration of 20 mL20\text{ }mL of oxalic acid (2 M) in acidic medium. The molarity of KMnO4KMnO_{4} solution should be ____ M.

  3. Question 3

    Classification of Elements and Periodicity. Asked once: 24 Jan 2026 S1 (same type asked 8 times) See all 8 of this type

    45
    Given below are two statements : Statement I: K>Mg>Al>BK > Mg > Al > B is the correct order in terms of metallic character. Statement II : Atomic radius is always greater than the ionic radius for any element. In the light of the above statements, choose the correct answer from the options given below

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  4. Question 4

    Classification of Elements and Periodicity. Asked once: 29 Jan 2024 (same type asked 8 times) See all 8 of this type

    136
    The element having the highest first ionization enthalpy is

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  5. Question 5

    The p-Block Elements. Asked once: 4 Apr 2025 (same type asked 8 times) See all 8 of this type

    117
    The elements of Group 13 with highest and lowest first ionisation enthalpies are respectively:

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