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Day 85: JEE Mains Chemistry

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

  1. Question 1

    Coordination Compounds. This type asked 2 times: 2021 Paper 15, 5 Apr 2026 S2. This one: 5 Apr 2026 S2 See all 2 of this type

    36
    Identify the correct statements from the following: (A) [Fe(C2O4)3]3−\left\lbrack Fe\left( C_{2}O_{4} \right)_{3} \right\rbrack^{3 -} is the most stable complex among [Fe(OH)6]3−,[Fe(C2O4)3]3−\left\lbrack Fe(OH)_{6} \right\rbrack^{3 -},\left\lbrack Fe\left( C_{2}O_{4} \right)_{3} \right\rbrack^{3 -} and [Fe(SCN)6]3−\left\lbrack Fe(SCN)_{6} \right\rbrack^{3 -} (B) The stability of [Cu(NH3)4]2+\left\lbrack Cu\left( {NH}_{3} \right)_{4} \right\rbrack^{2 +} is greater than that of [Cu(en)2]2+\left\lbrack Cu(en)_{2} \right\rbrack^{2 +} (C) The hybridization of Fe in K4[Fe(CN)6]K_{4}\left\lbrack Fe(CN)_{6} \right\rbrack is d2sp3d^{2}{sp}^{3} (D) [Fe(NO2)3Cl3]3−\left\lbrack Fe\left( {NO}_{2} \right)_{3}{Cl}_{3} \right\rbrack^{3 -} exhibits linkage isomerism (E) NO2−{NO}_{2}^{-}and SCN−{SCN}^{-}ligands are NOT ambidentate ligands Choose the correct answer from the options given below :

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  2. Question 2

    Hydrocarbons. This type asked 2 times: 24 Jan 2026 S1, 5 Apr 2026 S2. This one: 5 Apr 2026 S2 See all 2 of this type

    38
    IUPAC name of some alkenes are given below : Find out the correct stability order. (A) 2-Methylbut-2-ene (B) cis-But-2-ene (C) 2,3-Dimethylbut-2-ene (D) Prop-1-ene Choose the correct answer from the options given below:

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  3. Question 3

    Hydrocarbons. This type asked 2 times: 29 Jun 2022, 5 Apr 2026 S1. This one: 5 Apr 2026 S1 See all 2 of this type

    40
    For the following Friedel Craft's alkylation reaction, which of the statements are correct? (A) Major product is n -propyl benzene. (B) iso-propyl carbocation intermediate is also generated (C) Multiple substitution is inevitable. (D) Introducing electron-donating substituent on benzene will not produce any alkylbenzene. Choose the correct answer from the options given below :

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  4. Question 4

    Chemical Bonding and Molecular Structure. This type asked 2 times: 1 Feb 2024, 4 Apr 2026 S2. This one: 4 Apr 2026 S2 See all 2 of this type

    28
    Which of the following pictorial diagram most correctly represents the π∗\pi^{*} (π\pi - antibonding) molecular orbital between two atoms if the internuclear axis is taken to be in the z -direction (→z-axis)(\overset{z\text{-axis}}{\rightarrow}) ?

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  5. Question 5

    Chemical Thermodynamics. This type asked 2 times: 14 Jun 2022, 4 Apr 2026 S2. This one: 4 Apr 2026 S2 See all 2 of this type

    47
    For the following reaction at 50∘C50^{\circ}C and 2 atm pressure, 2 N2O5( g)⇌2 N2O4( g)+O2( g)2{\text{ }N}_{2}O_{5}(\text{ }g) \rightleftharpoons 2{\text{ }N}_{2}O_{4}(\text{ }g) + O_{2}\left( \text{ }g \right), N2O5N_{2}O_{5} is 50%50\% dissociated. The magnitude of standard free energy change at this temperature is x . x=x = ____\_\_\_\_ Jmol−1J{mol}^{- 1} [Nearest integer] Given : R=8.314 J mol−1 K−1,log⁡2=0.30R = 8.314\text{ }J{\text{ }mol}^{- 1}{\text{ }K}^{- 1},\log2 = 0.30,log⁡3=0.48,ln⁡10=2.303, ∘C+273=K\log3 = 0.48,\ln10 = 2.303,\ ^{\circ}C + 273 = K