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Day 15: JEE Mains Chemistry

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

  1. Question 1

    Aldehydes, Ketones and Carboxylic Acids. This type asked 6 times: 31 Jan 2023, 6 Apr 2023, 9 Apr 2024, 3 Apr 2025, 4 Apr 2025, 23 Jan 2026 S2. This one: 23 Jan 2026 S2 See all 6 of this type

    37
    Which of the following statements are TRUE about Haloform reaction? (A) Sodium hypochlorite reacts with KI to give KOI. (B) KOI is a reducing agent. (C) α,β\alpha,\beta-unsaturated methylketone will give iodoform reaction. (D) Isopropyl alcohol will not give iodoform test. (E) Methanoic acid will give positive iodoform test. Choose the correct answer from the options given below:

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  2. Question 2

    Biomolecules. This type asked 6 times: 2021 Paper 17, 2021 Paper 21, 28 Jun 2022, 28 Jan 2025, 7 Apr 2025, 22 Jan 2026 S1. This one: 22 Jan 2026 S1 See all 6 of this type

    40
    Given below are two statements: Statement I: Sucrose is dextrorotatory. However sucrose upon hydrolysis gives a solution having mixture of products. This solution shows laevorotation. Statement II : Hydrolysis of sucrose gives glucose and fructose. Since the laevorotation of glucose is more than the dextrorotation of fructose the resulting solution becomes laevorotatory. In the light of the above statements, choose the correct answer from the options given below.

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  3. Question 3

    Chemical Kinetics. This type asked 6 times: 13 Apr 2023, 1 Feb 2024, 9 Apr 2024, 23 Jan 2025, 7 Apr 2025, 21 Jan 2026 S2. This one: 21 Jan 2026 S2 See all 6 of this type

    33
    Decomposition of A is a first order reaction at T(K)T(K) and is given by A(g)→B(g)+C(g)A(g) \rightarrow B(g) + C(g). In a closed 1 L vessel, 1 bar A(g)A(g) is allowed to decompose at T(K)T(K). After 100 minutes, the total pressure was 1.5 bar. What is the rate constant (in min⁡−1\min^{- 1}) of the reaction ? (log⁡2=0.3\log2 = 0.3)

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  4. Question 4

    The d- and f-Block Elements. This type asked 6 times: 8 Apr 2023, 15 Apr 2023, 29 Jan 2024, 31 Jan 2024, 21 Jan 2026 S1, 21 Jan 2026 S2. This one: 21 Jan 2026 S2 See all 6 of this type

    45
    On heating a mixture of common salt and K2Cr2O7K_{2}Cr_{2}O_{7} in equal amount along with concentrated H2SO4H_{2}SO_{4} in a test tube, a gas is evolved. Formula of the gas evolved and oxidation state of the central metal atom in the gas respectively are :

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  5. Question 5

    The d- and f-Block Elements. This type asked 6 times: 2021 Paper 20, 31 Jan 2023, 31 Jan 2024, 28 Jan 2025, 4 Apr 2025, 7 Apr 2025. This one: 7 Apr 2025 See all 6 of this type

    39
    The first transition series metal ' MM ' has the highest enthalpy of atomisation in its series. One of its aquated ion ( Mn+M^{n +} ) exists in green colour. The nature of the oxide formed by the above Mn+M^{n +} ion is :

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