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Day 195: JEE Mains Chemistry

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

  1. Question 1

    The p-Block Elements. Asked once: 2021 Paper 16 (same type asked 2 times) See all 2 of this type

    32
    Electrolysis of sulphate compound solution will give:

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  2. Question 2

    Chemical Bonding and Molecular Structure. Asked once: 2021 Paper 17 (same type asked 2 times) See all 2 of this type

    55
    The total number of electrons in all bonding molecular orbitals of O22−O_{2}^{2 -} is (Round off to the nearest integer)

  3. Question 3

    Chemical Thermodynamics. Asked once: 15 Apr 2023 (same type asked 2 times) See all 2 of this type

    60
    30.4 kJ30.4\text{ }kJ of heat is required to melt one mole of sodium chloride and the entropy change at the melting point is 28.4 J K−1 mol−128.4\text{ }J{\text{ }K}^{- 1}{\text{ }mol}^{- 1} at 1 atm1\text{ }atm. The melting point of sodium chloride is_____ K (Nearest Integer)

  4. Question 4

    Electrochemistry. Asked once: 6 Apr 2023 (same type asked 2 times) See all 2 of this type

    144
    The standard reduction potential at 298 K298\text{ }K for the following half cells are given below:
    NO3−+4H++3e−→NO(g)+2H2O    E0=0.97 VNO_{3}^{-}+ 4H^{+}+ 3e^{-}\rightarrow NO\left( g \right)+ 2H_{2}O\ \ \ \ E^{0}= 0.97\text{ }V
     V2+(aq)+2e−→V             E0=−1.19 VFe3+(aq)+3e−→Fe             E0=−0.04 VAg+(aq)+e−→Ag(s)             E0=0.80 VAu3+(aq)+3e−→Au(s)             E0=1.40 V\begin{matrix} & \\ {\text{ }V}^{2 +}(aq) + 2e^{-}\rightarrow V & \ \ \ \ \ \ \ \ \ \ \ \ \ E^{0}= - 1.19\text{ }V \\ Fe^{3 +}(aq) + 3e^{-}\rightarrow Fe & \ \ \ \ \ \ \ \ \ \ \ \ \ E^{0}= - 0.04\text{ }V \\ Ag^{+}(aq) +e^{-}\rightarrow Ag(s) & \ \ \ \ \ \ \ \ \ \ \ \ \ E^{0}= 0.80\text{ }V \\ Au^{3 +}(aq) + 3e^{-}\rightarrow Au(s) & \ \ \ \ \ \ \ \ \ \ \ \ \ E^{0}= 1.40\text{ }V \end{matrix}
    The number of metal(s) which will be oxidized by NO3−NO_{3}^{-}in aqueous solution is___

  5. Question 5

    Hydrocarbons. Asked once: 4 Apr 2024 (same type asked 2 times) See all 2 of this type

    127
    Consider the above reactions, identify product BB and product CC.

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