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Day 355: JEE Mains Chemistry

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

  1. Question 1

    Solutions. Asked once: 26 Jun 2022 (same type asked 6 times) See all 6 of this type

    52
    A 0.5 percent solution of potassium chloride was found to freeze at −0.24∘C-0.24^{\circ}C. The percentage dissociation of potassium chloride is (Nearest integer) (Molal depression constant for water is 1.80 K kg1.80\text{ }K\text{ }kg mol−1mol^{- 1} and molar mass of KClKCl is 74.6 g mol−174.6\text{ }g{\text{ }mol}^{- 1} )

  2. Question 2

    Structure of Atom. Asked once: 2021 Paper 11 (same type asked 6 times) See all 6 of this type

    21
    The difference in energy between the 2nd and 3rd orbit of He+He^{+}ion will be?

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  3. Question 3

    The d- and f-Block Elements. Asked once: 24 Jan 2023 (same type asked 6 times) See all 6 of this type

    124
    K2Cr2O7K_{2}Cr_{2}O_{7} paper acidified with dilute H2SO4H_{2}SO_{4} turns green when exposed to

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  4. Question 4

    Equilibrium. Asked once: 28 Jun 2022 (same type asked 6 times) See all 6 of this type

    124
    A student needs to prepare a buffer solution of propanoic acid and its sodium salt with pH4pH4. The ratio of [CH3CH2COO−][CH3CH2COOH]\frac{\left\lbrack CH_{3}CH_{2}COO^{-} \right\rbrack}{\left\lbrack CH_{3}CH_{2}COOH \right\rbrack} required to make buffer is Given: Ka(CH3CH2COOH)=1.3×10−5K_{a}\left( CH_{3}CH_{2}COOH \right)= 1.3 \times10^{- 5}

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  5. Question 5

    Aldehydes, Ketones and Carboxylic Acids. Asked once: 6 Apr 2023 (same type asked 6 times) See all 6 of this type

    148
    Among the following, the number of compounds which will give positive iodoform reaction is ____ (a) 1-Phenylbutan-2-one (b) 2-Methylbutan-2-ol (c) 3-Methylbutan-2-ol (d) 1-Phenylethanol (e) 3,3-dimethylbutan-2-one (f) 1-Phenylpropan-2-ol