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Day 89: JEE Mains Chemistry

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

  1. Question 1

    Electrochemistry. This type asked 2 times: 29 Jun 2022, 24 Jan 2026 S1. This one: 24 Jan 2026 S1 See all 2 of this type

    46
    Electricity is passed through an acidic solution of Cu2+{Cu}^{2 +} till all the cu2+{cu}^{2 +} was exhausted, leading to the deposition of 300 mg of Cu metal. However, a current of 600 mA was continued to pass through the same solution for another 28 minutes by keeping the total volume of the solution fixed at 200 mL . The total volume of oxygen evolved at STP during the entire process is ____\_\_\_\_ mL. (Nearest integer) [Given : Cu2+(aq)+2e−→Cu(s)Ered 0=+0.34 V{Cu}^{2 +}(aq) + 2e^{-} \rightarrow Cu(s)E_{\text{red~}}^{0} = + 0.34\text{ }V O2( g)+4H++4e−→2H2OEred 0=+1.23 VO_{2}(\text{ }g) + 4H^{+} + 4e^{-} \rightarrow 2H_{2}OE_{\text{red~}}^{0} = + 1.23\text{ }V Molar mass of Cu=63.54 g mol−1Cu = 63.54\text{ }g{\text{ }mol}^{- 1} Molar mass of O2=32 g mol−1O_{2} = 32\text{ }g{\text{ }mol}^{- 1} Faraday Constant =96500Cmol−1= 96500C{mol}^{- 1} Molar volume at STP=22.4 LSTP = 22.4\text{ }L ]

  2. Question 2

    Equilibrium. This type asked 2 times: 30 Jan 2024, 24 Jan 2026 S1. This one: 24 Jan 2026 S1 See all 2 of this type

    47
    Consider two Group IV metal ions X2+X^{2 +} and Y2+Y^{2 +}. A solution containing 0.01MX2+0.01{MX}^{2 +} and 0.01MY2+0.01{MY}^{2 +} is saturated with H2 SH_{2}\text{ }S. The pH at which the metal sulphide YS will form as a precipitate is ____\_\_\_\_ (Nearest integer) (Given : Ksp(XS)=1×10−22K_{sp}(XS) = 1 \times 10^{- 22} at 25∘C,Ksp(YS)=4×10−1625^{\circ}C,K_{sp}(YS) = 4 \times 10^{- 16} at 25∘C25^{\circ}C, [H2 S]=0.1M\left\lbrack H_{2}\text{ }S \right\rbrack = 0.1M in solution, Ka1×Ka2(H2 S)=1.0×10−21K_{a1} \times K_{a2}\left( H_{2}\text{ }S \right) = 1.0 \times 10^{- 21}, log⁡2=0.30,log⁡3=0.48,log⁡5=0.70\log2 = 0.30,\log3 = 0.48,\log5 = 0.70 )

  3. Question 3

    Haloalkanes and Haloarenes. This type asked 2 times: 30 Jan 2024, 24 Jan 2026 S1. This one: 24 Jan 2026 S1 See all 2 of this type

    36
    Match the List-I with List-II
    List-I (Chloro derivative)List-II (Example)
    (A)Vinyl Chloride(I)CH2=CH−CH2Cl{CH}_{2} = CH - {CH}_{2}Cl
    (B)Benzyl chloride(II)CH3−CH(Cl)−CH3{CH}_{3} - CH(Cl) - {CH}_{3}
    (C)Alkyl chloride(III)CH2=CHCl{CH}_{2} = CHCl
    (D)Allyl chloride(IV)C6H5−CH(Cl)−CH3{C}_{6}{H}_{5} - CH(Cl) - {CH}_{3}
    Choose the correct answer from the options given below:

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  4. Question 4

    Chemical Thermodynamics. This type asked 2 times: 22 Jan 2025, 23 Jan 2026 S1. This one: 23 Jan 2026 S1 See all 2 of this type

    33
    A cup of water at 5∘C5^{\circ}C (system) is placed in a microwave oven and the oven is turned on for one minute during which, the water begins to boil. Which of the following option is true?

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  5. Question 5

    Electrochemistry. This type asked 2 times: 8 Apr 2024, 23 Jan 2026 S1. This one: 23 Jan 2026 S1 See all 2 of this type

    30
    In the given electrochemical cell, Ag(s)∣AgCl(s)∣FeCl2(aq), FeCl3(aq)∣Pt(s)Ag(s)|AgCl(s)|FeCl_{2}(aq),\ FeCl_{3}(aq) \mid Pt(s) at 298 K , the cell potential (Ecell E_{\text{cell~}}) will increase when : (A) Concentration of Fe2+{Fe}^{2 +} is increased. (B) Concentration of Fe3+{Fe}^{3 +} is decreased (C) Concentration of Fe2+{Fe}^{2 +} is decreased (D) Concentration of Fe3+{Fe}^{3 +} is increased (E) Concentration of Cl−{Cl}^{-} is increased. Choose the correct answer from the options given below :

    Tap an option to check your answer.