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Day 478: JEE Mains Chemistry

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

  1. Question 1

    Some Basic Concepts of Chemistry. Asked once: 27 Jun 2022

    59
    Two elements AA and BB which form 0.15 moles of A2 BA_{2}\text{ }B and AB3AB_{3} type compounds. If both A2 BA_{2}\text{ }B and AB3AB_{3} weigh equally, then the atomic weight of AA is ____ times the atomic weight of BB.

  2. Question 2

    Structure of Atom. Asked once: 11 Apr 2023

    144
    The number of correct statements from the following (A) For 1 s1\text{ }s orbital, the probability density is maximum at the nucleus. (B) For 2 s2\text{ }s orbital, the probability density first increases to maximum and then decreases sharply to zero. (C) Boundary surface diagrams of the orbitals encloses a region of 100%100\% probability of finding the electron. (D) p and d-orbitals have 1 and 2 angular nodes respectively. (E) Probability density of p-orbital is zero at the nucleus.

  3. Question 3

    The d- and f-Block Elements. Asked once: 29 Jul 2022

    130
    Which of the following 3 d3\text{ }d-metal ion will give the lowest enthalpy of hydration (Δhyd H)\left( \Delta_{\text{hyd~}}H \right) when dissolved in water?

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  4. Question 4

    The p-Block Elements. Asked once: 29 Jan 2024

    130
    On passing a gas, ' XX ', through Nessler's reagent, a brown precipitate is obtained. The gas ' XX ' is

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  5. Question 5

    Alcohols, Phenols and Ethers. Asked once: 27 Jan 2024

    41
    Given below are two statements: Statement (I): p-nitrophenol is more acidic than m-nitrophenol and o-nitrophenol. Statement (II): Ethanol will give immediate turbidity with Lucas reagent. In the light of the above statements, choose the correct answer from the options given below:

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