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Day 81: JEE Mains Chemistry

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

  1. Question 1

    Structure of Atom. Asked 2 times: 27 Jul 2022, 31 Jan 2023 See all 2 times it was asked

    128
    Arrange the following orbitals in decreasing order of energy. A. n=3,l=0, m=0n = 3,l = 0,\text{ }m = 0 B. n=4,l=0, m=0n = 4,l = 0,\text{ }m = 0 C. n=3,l=1, m=0n = 3,l = 1,\text{ }m = 0 D. n=3,l=2,m=1n = 3,l = 2,m = 1 The correct option for the order is:

    Tap an option to check your answer.

  2. Question 2

    Electrochemistry. Asked 2 times: 25 Jan 2023*, 30 Jan 2023 (* = numbers or wording changed that year) See all 2 times it was asked

    53
    Consider the cell
    Pt(s)∣H2( g,1 atm)∣H+(aq,1M)∣∣Fe3+(aq),Fe2+(aq)∣Pt(s)Pt_{(s)}\left| H_{2}(\text{ }g,1\text{ }atm) \right|H^{+}(aq,1M)||Fe^{3 +}(aq),Fe^{2 +}(aq) \mid Pt(s)
    When the potential of the cell is 0.712 V0.712\text{ }V at 298 K298\text{ }K, the ratio [Fe2+]/[Fe3+]\left\lbrack Fe^{2 +} \right\rbrack/\left\lbrack Fe^{3 +} \right\rbrack is (Nearest integer) Given: Fe3++e−=Fe2+,EθFe3+,Fe2+∣Pt=0.771Fe^{3 +}+e^{-}=Fe^{2 +},E^{\theta}Fe^{3 +},Fe^{2 +}\mid Pt = 0.771
    2.303RTF=0.06 V\frac{2.303RT}{F}= 0.06\text{ }V

  3. Question 3

    Equilibrium. Asked 2 times: 29 Jul 2022*, 30 Jan 2023 (* = numbers or wording changed that year) See all 2 times it was asked

    51
    600 mL600\text{ }mL of 0.01MHCl0.01MHCl is mixed with 400 mL400\text{ }mL of 0.01MH2SO40.01MH_{2}SO_{4}. The pHpH of the mixture is____ ×10−2\times10^{- 2}. (Nearest integer) [Given log⁡2=0.30\log2 = 0.30
    log⁡3=0.48\log3 = 0.48
    log⁡5=0.69\log5 = 0.69
    log⁡7=0.84\log7 = 0.84
    log⁡11=1.04]\log11 = 1.04\rbrack

  4. Question 4

    Coordination Compounds. Asked 2 times: 2021 Paper 25, 29 Jan 2023 See all 2 times it was asked

    53
    The sum of bridging carbonyls in W(CO)6W(CO)_{6} and Mn2(CO)10Mn_{2}(CO)_{10} is_____

  5. Question 5

    Organic Chemistry - Some Basic Principles and Techniques. Asked 2 times: 2021 Paper 19*, 25 Jan 2023 (* = numbers or wording changed that year) See all 2 times it was asked

    53
    In sulphur estimation, 0.471 g0.471\text{ }g of an organic compound gave 1.4439 g1.4439\text{ }g of barium sulphate. The percentage of sulphur in the compound is _____(Nearest Integer) (Given: Atomic mass Ba: 137u, S: 32u, 0:16u )