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Day 231: JEE Mains Chemistry

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

  1. Question 1

    Chemical Thermodynamics. Asked once: 25 Jun 2022 (same type asked 5 times) See all 5 of this type

    54
    The standard entropy change for the reaction 4Fe(s)+3O2( g)→2Fe2O3( s)4Fe(s) + 3O_{2}(\text{ }g) \rightarrow 2Fe_{2}O_{3}(\text{ }s) is −550JK−1- 550JK^{- 1} at 298 K298\text{ }K. [Given: The standard enthalpy change for the reaction is  −165 kJ mol−1]\left. \ - 165\text{ }kJ{\text{ }mol}^{- 1} \right\rbrack. The temperature in KK at which the reaction attains equilibrium is (Nearest Integer)

  2. Question 2

    Coordination Compounds. Asked once: 8 Apr 2024 (same type asked 5 times) See all 5 of this type

    40
    An octahedral complex with the formula CoCl3nNH3CoCl_{3}nNH_{3} upon reaction with excess of AgNO3AgNO_{3} solution gives 2 moles of AgClAgCl. Consider the oxidation state of CoCo in the complex is ' xx '. The value of " x+nx + n " is ____ .

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  3. Question 3

    The d- and f-Block Elements. Asked once: 28 Jul 2022 (same type asked 5 times) See all 5 of this type

    128
    Which of the following pair is not isoelectronic species? (At. no. Sm, 62; Er, 68: Yb, 70: Lu, 71; Eu, 63: Tb, 65; Tm, 69)

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  4. Question 4

    Organic Chemistry - Some Basic Principles and Techniques. Asked once: 12 Apr 2023 (same type asked 5 times) See all 5 of this type

    55
    Three organic compounds A,BA,B and CC were allowed to run in thin layer chromatography using hexane and gave the following result (see figure). The RfR_{f} value of the most polar compound is___ ×10−2\times10^{- 2}

  5. Question 5

    Amines. Asked once: 31 Jan 2023 (same type asked 5 times) See all 5 of this type

    133
    An organic compound [A](C4H11 N)\lbrack A\rbrack\left( C_{4}H_{11}\text{ }N \right), shows optical activity and gives N2N_{2} gas on treatment with HNO2HNO_{2}. The compound [A] reacts with PhSO2ClPhSO_{2}Cl producing a compound which is soluble in KOHKOH.

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