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Day 94: JEE Mains Chemistry

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

  1. Question 1

    Equilibrium. This type asked 2 times: 13 Apr 2023, 2 Apr 2025. This one: 2 Apr 2025 See all 2 of this type

    34
    If equal volumes of AB2AB_{2} and XY (both are salts) aqueous solutions are mixed, which of the following combination will give a precipitate of AY2AY_{2} at 300 K ?(Given Ksp(K_{sp}( at 300 K)) for AY2=5.2×10−7AY_{2}= 5.2 \times10^{- 7} )

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  2. Question 2

    Organic Reaction Mechanisms. This type asked 2 times: 2021 Paper 26, 2 Apr 2025. This one: 2 Apr 2025 See all 2 of this type

    116
    Match List-I With List-II.
    List-I (Reaction)List-II (Name of reaction)
    (A)2C6H5X+2Na→dry etherC6H5−C6H5+2NaX2C_{6}H_{5}X + 2Na \xrightarrow{\text{dry ether}} C_{6}H_{5}-C_{6}H_{5} + 2NaX(I)Lucas reaction
    (B)ArN2+X−→Cu, HClArCl+N2↑+CuXArN_{2}^{+}X^{-} \xrightarrow{Cu,\ HCl} ArCl + N_{2} \uparrow + CuX(II)Finkelstein reaction
    (C)C2H5Br+NaI→dry acetoneC2H5I+NaBrC_{2}H_{5}Br + NaI \xrightarrow{\text{dry acetone}} C_{2}H_{5}I + NaBr(III)Fittig reaction
    (D)CH3C(OH)(CH3)CH3→HCl, ZnCl2CH3C(Cl)(CH3)CH3CH_{3}C(OH)(CH_{3})CH_{3} \xrightarrow{HCl,\ ZnCl_{2}} CH_{3}C(Cl)(CH_{3})CH_{3}(IV)Gattermann reaction
    Choose the correct answer from the options given below:

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  3. Question 3

    The d- and f-Block Elements. This type asked 2 times: 24 Jan 2025, 2 Apr 2025. This one: 2 Apr 2025 See all 2 of this type

    41
    Choose the correct tests with respective observations. (A) CuSO4{CuSO}_{4} (acidified with acetic acid) + K4[Fe(CN)6]→K_{4}\left\lbrack Fe(CN)_{6} \right\rbrack \rightarrow Chocolate brown precipitate. (B) FeCl3+K4[Fe(CN)6]→{FeCl}_{3} + K_{4}\left\lbrack Fe(CN)_{6} \right\rbrack \rightarrow Prussian blue precipitate. (C) ZnCl2+K4[Fe(CN)6]{ZnCl}_{2} + K_{4}\left\lbrack Fe(CN)_{6} \right\rbrack, neutralised with NH4OH{NH}_{4}OH →\rightarrow White or bluish white precipitate. (D) MgCl2+K4[Fe(CN)6]→{MgCl}_{2} + K_{4}\left\lbrack Fe(CN)_{6} \right\rbrack \rightarrow Blue precipitate. (E) BaCl2+K4[Fe(CN)6]{BaCl}_{2} + K_{4}\left\lbrack Fe(CN)_{6} \right\rbrack, neutralised with NaOH →\rightarrow White precipitate. Choose the correct answer from the options given below :

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  4. Question 4

    Chemical Kinetics. This type asked 2 times: 12 Apr 2023, 29 Jan 2025. This one: 29 Jan 2025 See all 2 of this type

    39
    The reaction A2+B2→2ABA_{2}+B_{2}\rightarrow 2AB follows the mechanism
    A2⇌k1k−1 A+A( fast )A+B2→K2AB+B (slow) A+B→AB (fast) \begin{matrix} & A_{2}\underset{k_{- 1}}{\overset{k_{1}}{\rightleftharpoons}}\text{ }A + A(\text{~fast~}) \\ & A +B_{2}\overset{K_{2}}{\rightarrow}AB + B\text{~(slow)~} \\ & A + B \rightarrow AB\text{~(fast)~} \end{matrix}
    The overall order of the reaction is :

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  5. Question 5

    Coordination Compounds. This type asked 2 times: 23 Jan 2025, 29 Jan 2025. This one: 29 Jan 2025 See all 2 of this type

    112
    Identify the homoleptic complexes with odd number of d electrons in the central metal. (A) [FeO4]2−\left\lbrack FeO_{4} \right\rbrack^{2 -} (B) [Fe(CN)6]3−\left\lbrack Fe(CN)_{6} \right\rbrack^{3 -} (C) [Fe(CN)5NO]2−\left\lbrack Fe(CN)_{5}NO \right\rbrack^{2 -} (D) [CoCl4]2−\left\lbrack CoCl_{4} \right\rbrack^{2 -} (E) [Co(H2O)3 F3]\left\lbrack Co\left( H_{2}O \right)_{3}{\text{ }F}_{3} \right\rbrack Choose the correct answer from the options given below :

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