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Day 186: JEE Mains Chemistry

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

  1. Question 1

    Biomolecules. Asked once: 29 Jan 2023 (same type asked 2 times) See all 2 of this type

    129
    Following tetrapeptide can be represented as (F, L, D, Y, I, Q, P are one letter codes for amino acids)

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  2. Question 2

    Aldehydes, Ketones and Carboxylic Acids. Asked once: 4 Apr 2024 (same type asked 2 times) See all 2 of this type

    42
    Given below are two statements: Statement I: Acidity of α\alpha-hydrogens of aldehydes and ketones is responsible for Aldol reaction. Statement II: Reaction between benzaldehyde and ethanal will NOT give Cross - Aldol product. In the light of above statements, choose the most appropriate answer from the options given below.

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  3. Question 3

    Chemical Kinetics. Asked once: 2 Apr 2025 (same type asked 2 times) See all 2 of this type

    114
    Reactant A converts to product D through the given mechanism (with the net evolution of heat) : A→BA \rightarrow B slow; ΔH=+ve\Delta H = + ve B→CB \rightarrow C fast; ΔH=−ve\Delta H = - ve C→DC \rightarrow D fast ;ΔH=−ve;\Delta H = - ve Which of the following represents the above reaction mechanism?

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  4. Question 4

    Electrochemistry. Asked once: 29 Jun 2022 (same type asked 2 times) See all 2 of this type

    54
    A dilute solution of sulphuric acid is electrolysed using a current of 0.10 A0.10\text{ }A for 2 hours to produce hydrogen and oxygen gas. The total volume of gases produced at STP is ____ cm3\_\_\_\_\ cm^{3}. (Nearest integer) [Given: Faraday constant F=96500CF = 96500C mol−1mol^{- 1} at STP, molar volume of an ideal gas is 22.7 L mol−122.7\text{ }L{\text{ }mol}^{- 1} ]

  5. Question 5

    Equilibrium. Asked once: 30 Jan 2024 (same type asked 2 times) See all 2 of this type

    52
    The pHpH at which Mg(OH)2[ Ksp=1×10−11]Mg(OH)_{2}\left\lbrack {\text{ }K}_{sp}= 1 \times10^{- 11} \right\rbrack begins to precipitate from a solution containing 0.10M0.10M Mg2+Mg^{2 +} ions is ______