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Day 90: JEE Mains Chemistry

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

  1. Question 1

    Chemical Bonding and Molecular Structure. This type asked 2 times: 23 Jan 2025, 22 Jan 2026 S2. This one: 22 Jan 2026 S2 See all 2 of this type

    47
    If the enthalpy of sublimation of Li is 155 kJ mol−1155\text{ }kJ{\text{ }mol}^{- 1}, enthalpy of dissociation of F2F_{2} is 150 kJ mol−1150\text{ }kJ{\text{ }mol}^{- 1}, ionization enthalpy of Li is 520 kJ mol−1520\text{ }kJ{\text{ }mol}^{- 1}, electron gain enthalpy of FF is −313 kJ mol−1- 313\text{ }kJ{\text{ }mol}^{- 1}, standard enthalpy of formation of LiF is −594 kJ mol−1- 594\text{ }kJ{\text{ }mol}^{- 1}. The magnitude of lattice enthalpy of LiF is ____\_\_\_\_ kJmol−1kJ{mol}^{- 1} (Nearest integer).

  2. Question 2

    Electrochemistry. This type asked 2 times: 24 Jan 2025, 22 Jan 2026 S2. This one: 22 Jan 2026 S2 See all 2 of this type

    42
    Consider the following reduction processes :
    Al3++3e−→Al(s),E∘=−1.66 VFe3++e−→Fe2+,E∘=+0.77 VCo3++e−→Co2+,E∘=+1.81 VCr3++3e−→Cr(s),E∘=−0.74 V\begin{matrix} Al^{3+} + 3e^{-} \rightarrow Al(s), & E^{\circ} = -1.66\ V \\ Fe^{3+} + e^{-} \rightarrow Fe^{2+}, & E^{\circ} = +0.77\ V \\ Co^{3+} + e^{-} \rightarrow Co^{2+}, & E^{\circ} = +1.81\ V \\ Cr^{3+} + 3e^{-} \rightarrow Cr(s), & E^{\circ} = -0.74\ V \end{matrix}
    The tendency to act as reducing agent decreases in the order :

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  3. Question 3

    Hydrocarbons. This type asked 2 times: 30 Jan 2024, 22 Jan 2026 S2. This one: 22 Jan 2026 S2 See all 2 of this type

    27
    Consider the following reaction : X⟶(i) NaNH2(ii) (CH3)2CHBrYX \underset{\text{(ii) }(CH_{3})_{2}CHBr}{\overset{\text{(i) }NaNH_{2}}{\longrightarrow}} Y The product Y formed is :

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  4. Question 4

    The p-Block Elements. This type asked 2 times: 28 Jun 2022, 22 Jan 2026 S2. This one: 22 Jan 2026 S2 See all 2 of this type

    34
    Given below are two statements : Statement-I : Element ' X ' and  ′Y\ 'Y ' are the most and least electronegative elements, respectively among N,As,SbN,As,Sb and P . The nature of the oxides X2O3X_{2}O_{3} and Y2O3Y_{2}O_{3} is acidic and amphoteric, respectively. Statement-II : BCl3{BCl}_{3} is covalent in nature and gets hydrolysed in water. It produces [B(OH)4]−\left\lbrack B(OH)_{4} \right\rbrack^{-}and [B(H2O)6]3+\left\lbrack B\left( H_{2}O \right)_{6} \right\rbrack^{3 +} in aqueous medium. In the light of the above statements, choose the correct answer from the options given below :

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  5. Question 5

    Haloalkanes and Haloarenes. This type asked 2 times: 8 Apr 2024, 21 Jan 2026 S2. This one: 21 Jan 2026 S2 See all 2 of this type

    34
    The correct order of reactivity of the following benzyl halides towards reaction with KCN is:

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