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Day 398: JEE Mains Chemistry

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

  1. Question 1

    Some Basic Concepts of Chemistry. Asked once: 29 Jan 2025

    31
    Choose the correct statements. (A) Weight of a substance is the amount of matter present in it. (B) Mass is the force exerted by gravity on an object. (C) Volume is the amount of space occupied by a substance. (D) Temperatures below 0∘C0^{\circ}C are possible in Celsius scale, but in Kelvin scale negative temperature is not possible. (E) Precision refers to the closeness of various measurements for the same quantity.

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  2. Question 2

    Structure of Atom. Asked once: 28 Jan 2026 S1

    42
    Figure 1 (top): electron probability density for the 2s orbital. Figure 2 (bottom): wave function for the 2s orbital. Which point in Figure 2 accurately represents the same nodal surface as Figure 1?

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  3. Question 3

    The d- and f-Block Elements. Asked once: 4 Apr 2026 S1

    35
    The correct statements among the following are, (A) Mo(VI)Mo(VI) and W(VI)W(VI) are less stable than Cr(VI)Cr(VI). (B) Ce4+{Ce}^{4 +} and Tb4+{Tb}^{4 +} are oxidant while Eu2+{Eu}^{2 +} and Yb2+{Yb}^{2 +} are reductant. (C) Cm and Am have seven unpaired electrons. (D) Actinoid contraction is greater from element to element than lanthanoid contraction. Choose the correct answer from the options given below :

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  4. Question 4

    The p-Block Elements. Asked once: 24 Jan 2026 S2

    33
    One mole of Cl2( g)Cl_{2}(\text{ }g) was passed into 2 L of cold 2 M KOH solution. After the reaction, the concentrations of Cl−,ClO−Cl^{-},ClO^{-}and OH−OH^{-}are respectively (assume volume remains constant)

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  5. Question 5

    Alcohols, Phenols and Ethers. Asked once: 4 Apr 2026 S1

    45
    Identify the colour of compound ' X ' in the sequence of the reaction.

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