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Day 144: JEE Mains Chemistry

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

  1. Question 1

    Equilibrium. Asked once: 24 Jan 2026 S2 (same type asked 4 times) See all 4 of this type

    30
    Consider the following gaseous equilibrium in a closed container of volume "V" at T(K). P2( g)+Q2( g)⇌2PQ(g)P_{2}(\text{ }g) +Q_{2}(\text{ }g) \rightleftharpoons 2PQ\left( g \right) 2 moles each of P2( g),Q2( g)P_{2}(\text{ }g),Q_{2}(\text{ }g) and PQ(g)PQ(g) are present at equilibrium. Now one mole each of ' P2P_{2} ' and ' Q2Q_{2} ' are added to the equilibrium keeping the temperature at T(K)T(K). The number of moles of P2P_{2}, Q2Q_{2} and PQ at the new equilibrium, respectively, are -

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  2. Question 2

    Chemical Thermodynamics. Asked once: 4 Apr 2025 (same type asked 4 times) See all 4 of this type

    30
    One mole of an ideal gas expands isothermally and reversibly from 10dm310dm^{3} to 20dm320dm^{3} at 300 K300\text{ }K. ΔU\Delta U, q and work done in the process respectively are Given : R=8.3 JK−1mol−1R = 8.3\ JK^{- 1}mol^{- 1}, ln⁡10=2.3\ln 10 = 2.3, log⁡2=0.30, log⁡3=0.48\log2 = 0.30,\ \log3 = 0.48

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  3. Question 3

    Electrochemistry. Asked once: 21 Jan 2026 S1 (same type asked 4 times) See all 4 of this type

    47
    The pH and conductance of a weak acid (HX) was found to be 5 and 4×10−5 S4 \times 10^{- 5}\text{ }S, respectively. The conductance was measured under standard condition using a cell where the electrode plates having a surface area of 1 cm21{\text{ }cm}^{2} were at a distance of 15 cm apart. The value of the limiting molar conductivity is ____\_\_\_\_ Sm2 mol−1Sm^{2}{\text{ }mol}^{- 1}. (nearest integer) (Given: degree of dissociation of the weak acid (a) << 1)

  4. Question 4

    Solutions. Asked once: 28 Jun 2022 (same type asked 4 times) See all 4 of this type

    55
    The vapour pressures of two volatile liquids AA and BB at 25∘C25^{\circ}C are 50 Torr and 100 Torr, respectively. If the liquid mixture contains 0.3 mole fraction of AA, then the mole fraction of liquid BB in the vapour phase is x17\frac{x}{17}. The value of xx is

  5. Question 5

    Aldehydes, Ketones and Carboxylic Acids. Asked once: 22 Jan 2025 (same type asked 4 times) See all 4 of this type

    40
    The compounds which give positive Fehling's test are: (A) C6H5CHOC_{6}H_{5}CHO (B) C6H5COCH3C_{6}H_{5}COCH_{3} (C) HOCH2−CO−(CHOH)3−CH2−OHHOCH_{2}- CO - (CHOH)_{3}-CH_{2}- OH (D) CH3CHOCH_{3}CHO (E) C6H5CH2CHOC_{6}H_{5}CH_{2}CHO Choose the CORRECT answer from the options given below :

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