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Day 158: JEE Mains Chemistry

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

  1. Question 1

    Electrochemistry. Asked once: 1 Feb 2023 (same type asked 3 times) See all 3 of this type

    146
    1×10−5MAgNO31 \times10^{- 5}MAgNO_{3} is added to 1 L1\text{ }L of saturated solution of AgBrAgBr. The conductivity of this solution at 298 K298\text{ }K is______ ×10−8 S m−1\times10^{- 8}\text{ }S{\text{ }m}^{- 1} [Given: KSP(AgBr)=4.9×10−13K_{SP}(AgBr) = 4.9 \times10^{- 13} at 298 K298\text{ }K
    λAg+0=6×10−3 S m2 mol−1λBr−0=8×10−3 S m2 mol−1 λNO3−0=7×10−3 S m2 mol−1]\begin{matrix} & \lambda_{Ag^{+}}^{0}= 6 \times10^{- 3}\text{ }S{\text{ }m}^{2}{\text{ }mol}^{- 1} \\ & \lambda_{Br^{-}}^{0}= 8 \times10^{- 3}\text{ }S{\text{ }m}^{2}{\text{ }mol}^{- 1} \\ & \left. \ \lambda_{NO_{3}^{-}}^{0}= 7 \times10^{- 3}\text{ }S{\text{ }m}^{2}{\text{ }mol}^{- 1} \right\rbrack \end{matrix}

  2. Question 2

    Equilibrium. Asked once: 2021 Paper 19 (same type asked 3 times) See all 3 of this type

    52
    The equilibrium constant KcK_{c} at 298 K298\text{ }K for the reaction A+B⇌C+DA + B \rightleftharpoons C + D is 100. Starting with an equimolar solution with concentrations of A,B,CA,B,C and DD all equal to 1M1M, the equilibrium concentration of DD is ____\_\_\_\_ ×10−2\times10^{- 2} M. (Nearest integer)

  3. Question 3

    Biomolecules. Asked once: 5 Apr 2026 S1 (same type asked 3 times) See all 3 of this type

    44
    Identify the correct statements (A) Glucose exist in two anomeric forms. (B) Anomers of glucose differ in configuration at C -1 in cyclic hemiacetal structure. (C) Melting point of α\alpha-anomer of glucose is greater than β\beta-anomer. (D) Specific rotation of α\alpha-anomer is +19∘+ 19^{\circ} while for β\beta-anomer is +112∘+ 112^{\circ} (E) α\alpha and β\beta-anomers of glucose are prepared by crystallization of saturated glucose solution at 303 K and 371 K respectively. Choose the correct answer from the options given below :

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  4. Question 4

    Coordination Compounds. Asked once: 22 Jan 2026 S1 (same type asked 3 times) See all 3 of this type

    26
    Consider the transition metal ions Mn3+,Cr3+,Fe3+Mn^{3 +},Cr^{3 +},Fe^{3 +} and Co3+Co^{3 +} and all form low spin octahedral complexes. The correct decreasing order of unpaired electrons in their respective d-orbitals of the complexes is

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  5. Question 5

    Chemical Kinetics. Asked once: 7 Apr 2025 (same type asked 3 times) See all 3 of this type

    104
    A(g)→B(g)+C(g)A(g) \rightarrow B(g) + C(g) is a first order reaction.
    Timett∞\infty
    PsystemP_{\text{system}}PtP_{t}P∞P_{\infty}
    The reaction was started with reactant A only. Which of the following expression is correct for rate constant k ?

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