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Day 454: JEE Mains Chemistry

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

  1. Question 1

    Some Basic Concepts of Chemistry. Asked once: 25 Jan 2023

    131
    What is the mass ratio of ethylene glycol (C2H6O2\left( C_{2}H_{6}O_{2} \right., molar mass  =62 g/mol)\left. \ = 62\text{ }g/mol \right) required for making 500 g500\text{ }g of 0.25 molal aqueous solution and 250 mL250\text{ }mL of 0.25 molal aqueous solution?

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  2. Question 2

    Structure of Atom. Asked once: 6 Apr 2024

    57
    Frequency of the de-Broglie wave of electron in Bohr's first orbit of hydrogen atom is ____ ×1013 Hz\times10^{13}\text{ }Hz (nearest integer). [Given: RHR_{H} (Rydberg constant) =2.18×10−18 J= 2.18 \times10^{- 18}\text{ }J. hh (Plank's constant) =6.6×10−34J.s= 6.6 \times10^{- 34}J.s.]

  3. Question 3

    The d- and f-Block Elements. Asked once: 11 Apr 2023

    33
    When a solution of mixture having two inorganic salts was treated with freshly prepared ferrous sulphate in acidic medium, a dark brown ring was formed whereas on treatment with neutral FeCl3FeCl_{3}, it gave deep red colour which disappeared on boiling and a brown red ppt was formed. The mixture contains

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  4. Question 4

    The p-Block Elements. Asked once: 5 Apr 2024

    50
    The number of neutrons present in the more abundant isotope of boron is ' xx '. Amorphous boron upon heating with air forms a product, in which the oxidation state of boron is ' yy '. The value of x+yx + y is ...

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  5. Question 5

    Alcohols, Phenols and Ethers. Asked once: 5 Apr 2024

    33
    Identify compound (Z)(Z) in the following reaction sequence.

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