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Day 123: JEE Mains Chemistry

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

  1. Question 1

    The p-Block Elements. Asked once: 22 Jan 2026 S1 (same type asked 6 times) See all 6 of this type

    39
    Given below are two statements : Statement I: The halogen that makes longest bond with hydrogen in HX, has the smallest covalent radius in its group. Statement II : A group 15 element's hydride EH3{EH}_{3} has the lowest boiling point among corresponding hydrides of other group 15 elements. The maximum covalency of that element E is 4 . In the light of the above statements, choose the correct answer from the options given below.

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  2. Question 2

    Equilibrium. Asked once: 4 Apr 2026 S1 (same type asked 6 times) See all 6 of this type

    49
    The pH a solution obtained by mixing 5 mL of 0.1MNH4OH0.1M{NH}_{4}OH solution with 250 mL of 0.1 M NH4Cl{NH}_{4}Cl solution is ____\_\_\_\_ ×10−2\times 10^{- 2}. (Nearest integer) Given : pKb(NH4OH)=4.74{pK}_{b}\left( {NH}_{4}OH \right) = 4.74
    log⁡2=0.30\log2 = 0.30
    log⁡3=0.48\log3 = 0.48
    log⁡5=0.70\log5 = 0.70

  3. Question 3

    Hydrocarbons. Asked once: 3 Apr 2025 (same type asked 6 times) See all 6 of this type

    42
    Which compound would give 3-methyl-6-oxoheptanal upon ozonolysis?

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  4. Question 4

    Chemical Bonding and Molecular Structure. Asked once: 24 Jan 2026 S2 (same type asked 6 times) See all 6 of this type

    31
    Pair of species among the following having same bond order as well as paramagnetic character will be-

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  5. Question 5

    Solutions. Asked once: 8 Apr 2024 (same type asked 6 times) See all 6 of this type

    60
    A solution containing 10 g10\text{ }g of an electrolyte AB2AB_{2} in 100 g100\text{ }g of water boils at 100.52∘C100.52^{\circ}C. The degree of ionization of the electrolyte (α)(\alpha) is ______ ×10−1\times10^{- 1}. (nearest integer) [Given : Molar mass of AB2=200 g mol −1.KbAB_{2}= 200\text{ }g\text{ }mol\ ^{- 1}.K_{b} (molal boiling point elevation const. of water) =0.52 K kg mol−1= 0.52\text{ }K\text{ }kg{\text{ }mol}^{- 1}, boiling point of water =100∘C=100^{\circ}C; AB2AB_{2} ionises as  AB2→A2++2 B−]\left. \ AB_{2}\rightarrow A^{2 +}+ 2{\text{ }B}^{-} \right\rbrack