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Day 141: JEE Mains Chemistry

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

  1. Question 1

    Equilibrium. Asked once: 2021 Paper 23 (same type asked 4 times) See all 4 of this type

    56
    The pHpH of a solution obtained by mixing 50 mL50\text{ }mL of 1MHCl1MHCl and 30 mL30\text{ }mL of 1MNaOH1MNaOH is x×10−4x \times10^{- 4}. The value of xx is ____\_\_\_\_. (Nearest integer) [ log⁡2.5=0.3979]\log2.5 = 0.3979\rbrack

  2. Question 2

    Aldehydes, Ketones and Carboxylic Acids. Asked once: 8 Apr 2024 (same type asked 4 times) See all 4 of this type

    133
    The correct sequence of acidic strength of the following aliphatic acids in their decreasing order is: CH3CH2COOH,CH3COOH,CH3CH2CH2COOHCH_{3}CH_{2}COOH,CH_{3}COOH,CH_{3}CH_{2}CH_{2}COOH, HCOOHHCOOH

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  3. Question 3

    Biomolecules. Asked once: 31 Jan 2023 (same type asked 4 times) See all 4 of this type

    140
    Compound A, C5H10O5C_{5}H_{10}O_{5}, given a tetraacetate with AC2OAC_{2}O and oxidation of AA with Br2−H2OBr_{2}-H_{2}O gives an acid, C5H10O6C_{5}H_{10}O_{6}. Reduction of AA with HIHI gives isopentane. The possible structure of AA is

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  4. Question 4

    Chemical Kinetics. Asked once: 30 Jan 2024 (same type asked 4 times) See all 4 of this type

    51
    The rate of first order reaction is 0.04 mol L−1 s−10.04\text{ }mol{\text{ }L}^{- 1}{\text{ }s}^{- 1} at 10 minutes and 0.03 mol L−1 s−10.03\text{ }mol{\text{ }L}^{- 1}{\text{ }s}^{- 1} at 20 minutes after initiation. Half life of the reaction is ____ minutes. (Given log⁡2=0.3010,log⁡3=0.4771\log2 = 0.3010,\log3 = 0.4771 )

  5. Question 5

    Alcohols, Phenols and Ethers. Asked once: 7 Apr 2025 (same type asked 4 times) See all 4 of this type

    40
    Which of the following compounds is least likely to give effervescence of CO2CO_{2} in presence of aq. NaHCO3NaHCO_{3} ?

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