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Day 135: JEE Mains Chemistry

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

  1. Question 1

    Solutions. Asked once: 5 Apr 2024 (same type asked 5 times) See all 5 of this type

    149
    Considering acetic acid dissociates in water, its dissociation constant is 6.25×10−56.25 \times10^{- 5}. If 5 mL5\text{ }mL of acetic acid is dissolved in 1 litre water, the solution will freeze at −x×10−2 ∘C- x \times10^{- 2}\ ^{\circ}C, provided pure water freezes at 0∘C0^{\circ}C. x=x =__________ . (Nearest integer) Given: (Kf)water =1.86 K kg mol−1\left( K_{f} \right)_{\text{water~}}= 1.86\text{ }K\text{ }kg{\text{ }mol}^{- 1}. density of acetic acid is 1.2 g mL−11.2\text{ }g{\text{ }mL}^{- 1} molar mass of water =18 g mol−1= 18\text{ }g{\text{ }mol}^{- 1}. molar mass of acetic acid =60 g mol−1= 60\text{ }g{\text{ }mol}^{- 1}. density of water =1 g cm−3= 1\text{ }g{\text{ }cm}^{- 3} Acetic acid dissociates as
    CH3COOH⇌CH3COO⊕+H⊕CH_{3}COOH \rightleftharpoons CH_{3}COO^{\oplus}+H^{\oplus}

  2. Question 2

    Chemical Bonding and Molecular Structure. Asked once: 4 Apr 2024 (same type asked 5 times) See all 5 of this type

    142
    Number of compounds/species from the following with non-zero dipole moment is _____
    BeCl2,BCl3,NF3,XeF4,CCl4,H2O,H2S,HBr,CO2,H2,HClBeCl_{2},BCl_{3},NF_{3},XeF_{4},CCl_{4},H_{2}O,H_{2}S,HBr,CO_{2},H_{2},HCl

  3. Question 3

    Chemical Thermodynamics. Asked once: 8 Apr 2023 (same type asked 5 times) See all 5 of this type

    144
    For complete combustion of ethene. C2H4( g)+3O2( g)→2CO2( g)+2H2O(l)C_{2}H_{4}(\text{ }g) + 3O_{2}(\text{ }g) \rightarrow 2CO_{2}(\text{ }g) + 2H_{2}O(l) the amount of heat produced as measured in bomb calorimeter is 1406 kJ mol−11406\text{ }kJ{\text{ }mol}^{- 1} at 300 K300\text{ }K. The minimum value of TΔST\Delta S needed to reach equilibrium is (−)( - ) ____kJkJ. (Nearest integer) Given: R=8.3JK−1 mol−1R = 8.3JK^{- 1}{\text{ }mol}^{- 1}

  4. Question 4

    Classification of Elements and Periodicity. Asked once: 31 Jan 2023 (same type asked 5 times) See all 5 of this type

    42
    The correct increasing order of the ionic radii is

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  5. Question 5

    Amines. Asked once: 31 Jan 2024 (same type asked 5 times) See all 5 of this type

    130
    Given below are two statements: Statement I: Aniline reacts with con. H2SO4H_{2}SO_{4} followed by heating at 453−473 K453 - 473\text{ }K gives pp-aminobenzene sulphonic acid, which gives blood red colour in the 'Lassaigne's test'. Statement II: In Friedel - Craft's alkylation and acylation reactions, aniline forms salt with the AlCl3AlCl_{3} catalyst. Due to this, nitrogen of aniline acquires a positive charge and acts as deactivating group. In the light of the above statements, choose the correct answer from the options given below:

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