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Day 260: JEE Mains Chemistry

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

  1. Question 1

    Chemical Thermodynamics. Asked once: 2021 Paper 26 (same type asked 3 times) See all 3 of this type

    53
    The average S−FS - F bond energy in kJmol−1kJmol^{- 1} of SF6SF_{6} is (Rounded off to the nearest integer) [Given: The values of standard enthalpy of formation of SF6( g),S(g)SF_{6}(\text{ }g),S(g) and F(g)F(g) are - 1100, 275 and 80 kJ mol−180\text{ }kJ{\text{ }mol}^{- 1} respectively.]

  2. Question 2

    Electrochemistry. Asked once: 29 Jan 2023 (same type asked 3 times) See all 3 of this type

    144
    The equilibrium constant for the reaction Zn(s)+Sn2+(aq)⇌Zn2+(aq)+Sn(s)Zn(s) +Sn^{2 +}(aq) \rightleftharpoons Zn^{2 +}(aq) + Sn(s) is 1×10201 \times10^{20} at 298 K298\text{ }K. The magnitude of standard electrode potential of Sn/Sn2+Sn/Sn^{2 +} if EZn2+/Zn∘=−0.76 VE_{Zn^{2 +}/Zn}^{\circ}= - 0.76\text{ }V is ____×10−2 V\_\_\_\_\times10^{- 2}\text{ }V (Nearest integer). Given: 2.303RTF=0.059 V\frac{2.303RT}{F}= 0.059\text{ }V

  3. Question 3

    The d- and f-Block Elements. Asked once: 27 Jul 2022 (same type asked 3 times) See all 3 of this type

    42
    The total number of Mn=OMn = O bonds in Mn2O7Mn_{2}O_{7} is

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  4. Question 4

    The p-Block Elements. Asked once: 2021 Paper 4 (same type asked 3 times) See all 3 of this type

    33
    The correct order of bond dissociation enthalpy of halogen is:

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  5. Question 5

    Biomolecules. Asked once: 9 Apr 2024 (same type asked 3 times) See all 3 of this type

    59
    Total number of essential amino acid among the given list of amino acids is__. Arginine, Phenylalanine, Aspartic acid, Cysteine, Histidine, Valine, Proline