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Day 232: JEE Mains Chemistry

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

  1. Question 1

    Solutions. Asked once: 13 Apr 2023 (same type asked 5 times) See all 5 of this type

    150
    Sea water contains 29.25%NaCl29.25\% NaCl and 19%MgCl219\%MgCl_{2} by weight of solution. The normal boiling point of the sea water is _____ ∘C\_\_\_\_\_\ ^{\circ}C (Nearest integer) Assume 100%100\% ionization for both NaClNaCl and MgCl2MgCl_{2} Given : Kb(H2O)=0.52 K kg mol−1K_{b}\left( H_{2}O \right)= 0.52\text{ }K\text{ }kg{\text{ }mol}^{- 1} Molar mass of NaClNaCl and MgCl2MgCl_{2} is 58.5 and 95 g95\text{ }g mol−1mol^{- 1} respectively.

  2. Question 2

    Chemical Bonding and Molecular Structure. Asked once: 29 Jan 2024 (same type asked 5 times) See all 5 of this type

    150
    The total number of molecules with zero dipole moment among CH4,BF3,H2O,HF,NH3,CO2CH_{4},BF_{3},H_{2}O,HF,NH_{3},CO_{2} and SO2SO_{2} is _____

  3. Question 3

    Chemical Thermodynamics. Asked once: 26 Jul 2022 (same type asked 5 times) See all 5 of this type

    143
    For the reaction
    H2 F2( g)→H2( g)+F2( g)H_{2}{\text{ }F}_{2}(\text{ }g) \rightarrow H_{2}(\text{ }g) +F_{2}(\text{ }g)
    ΔU=−59.6 kJ mol−1\Delta U = - 59.6\text{ }kJ{\text{ }mol}^{- 1} at 27∘C27^{\circ}C. The enthalpy change for the above reaction is (−)( - ) ____\_\_\_\_ kJmol−1kJmol^{- 1} [nearest integer] Given: R=8.314R = 8.314 JK−1 mol−1JK^{- 1}{\text{ }mol}^{- 1}.

  4. Question 4

    Classification of Elements and Periodicity. Asked once: 27 Jun 2022 (same type asked 5 times) See all 5 of this type

    125
    The correct order of increasing ionic radii is

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  5. Question 5

    Amines. Asked once: 26 Jul 2022 (same type asked 5 times) See all 5 of this type

    50
    Given below are two statements: one is labelled as Assertion (a) and the other is labelled as Reason (R). Assertion (a): Experimental reaction of CH3ClCH_{3}Cl with aniline and anhydrous AlCl3AlCl_{3} does not give o and p-methylaniline. Reason (R): The −NH2-NH_{2} group of aniline becomes deactivating because of salt formation with anhydrous AlCl3AlCl_{3} and hence yields mm-methyl aniline as the product. In the light of the above statements, choose the most appropriate answer from the options given below:

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