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Day 410: JEE Mains Chemistry

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

  1. Question 1

    Some Basic Concepts of Chemistry. Asked once: 23 Jan 2025

    33
    2.8×10−3 mol2.8 \times10^{- 3}\text{ }mol of CO2CO_{2} is left after removing 102110^{21} molecules from its ' xx ' mg sample. The mass of CO2CO_{2} taken initially is Given : NA=6.02×1023 mol−1N_{A}= 6.02 \times10^{23}{\text{ }mol}^{- 1}

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  2. Question 2

    Structure of Atom. Asked once: 7 Apr 2025

    32
    A. When Cs is placed inside a vacuum chamber with an ammeter connected to it and yellow light is focused on Cs the ammeter shows the presence of current. B. When the brightness of the yellow light is dimmed, the value of the current in the ammeter is reduced. C. When a red light is used instead to the yellow light, the current produced is higher with respect to the yellow light. D. When a blue light is used, the ammeter shows the formation of current. E. When a white light is used, the ammeter shows formation of current. Choose the correct answer from the options given below:

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  3. Question 3

    The d- and f-Block Elements. Asked once: 29 Jan 2025

    36
    The correct option with order of melting points of the pairs (Mn,Fe),(Tc,Ru)(Mn,Fe),(Tc,Ru) and (Re,Os)(Re,Os) is :

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  4. Question 4

    The p-Block Elements. Asked once: 4 Apr 2025

    114
    Given below are two statements : Statement (I) : The first ionisation enthalpy of group 14 elements is higher than the corresponding elements of group 13 . Statement (II) : Melting points and boiling points of group 13 elements are in general much higher than those the corresponding elements of group 14. In the light of the above statements, choose the most appropriate answer from the options given below :

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  5. Question 5

    Alcohols, Phenols and Ethers. Asked once: 24 Jan 2026 S1

    40
    A hydroxy compound (X) with molar mass 122 g mol−1mol^{- 1} is acetylated with acetic anhydride, using a large excess of the reagent ensuring complete acetylation of all hydroxyl groups. The product obtained has a molar mass of 290 g mol−1290\text{ }g{\text{ }mol}^{- 1}. The number of hydroxyl groups present in compound (X)(X) is :

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