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Indian Navy Pilot JEE Main 2023 Mixed — practice questions — page 2

Explore 40 free JEE Main 2023 Mixed questions in Indian Navy Pilot Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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JEE Main 2023 Mixed questions and exercises with answers

Showing questions 31–40 of 40.

Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Which principle is being described?Read the answer and worked solution →Flip and pair: symbol with meaningRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Tap every statement true of the Schrodinger modelRead the answer and worked solution →Reading the models backRead the answer and worked solution →Assertion and reason: filling orbitalsRead the answer and worked solution →True or false: shells and subshellsRead the answer and worked solution →Complete the two filling rulesRead the answer and worked solution →

Worked practice questions

Two are true, one is not

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Questions
  1. False statement
    Bohr's model accounted for the electron's wave nature
    Statements
    1. Bohr explained the hydrogen spectrum
    2. Bohr's model failed for multi-electron atoms
    3. Bohr's model accounted for the electron's wave nature
  2. False statement
    Rutherford explained why the atom is stable
    Statements
    1. Rutherford explained why the atom is stable
    2. Rutherford found a tiny dense nucleus
    3. Rutherford's model resembled the solar system
  3. False statement
    Hund's rule forbids two electrons in one orbital
    Statements
    1. Pauli forbids identical sets of four quantum numbers
    2. Hund's rule forbids two electrons in one orbital
    3. Hund's rule fills singly before pairing
The false line always credits a model with something it could not do. Source: syllabus Chemistry Part I, Ch 2 Structure of Atom.

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Three of these are wrong. Find the one that holds.

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Questions
  1. Question
    Three of these statements about Bohr's model are false.
    Choices
    1. Item
      It explained the hydrogen spectrum
      Correct
      Yes
    2. Explanation
      It could not explain their spectra.
      Item
      It worked for multi-electron atoms
    3. Explanation
      Bohr treated the electron as a particle in an orbit.
      Item
      It included the electron's wave nature
    4. Explanation
      A definite orbit contradicts that principle.
      Item
      It agrees with the uncertainty principle
  2. Question
    Three of these statements about Thomson's model are false.
    Choices
    1. Item
      Electrons embedded in positive charge
      Correct
      Yes
    2. Explanation
      That is Rutherford's picture, not Thomson's.
      Item
      It featured a dense central nucleus
    3. Explanation
      Alpha-particle scattering disproved it.
      Item
      It survived the scattering experiment
    4. Explanation
      Fixed orbits came later, with Bohr.
      Item
      It described fixed electron orbits
Each trap awards a model an achievement that belongs to a later one. Source: syllabus Chemistry Part I, Ch 2 Structure of Atom.

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Which principle is being described?

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Items
  1. Item
    No two electrons share four quantum numbers
    Category
    Pauli
  2. Item
    Caps an orbital at two electrons
    Category
    Pauli
  3. Item
    Fill singly before pairing
    Category
    Hund
  4. Item
    About maximum multiplicity
    Category
    Hund
  5. Item
    Position and velocity cannot both be exact
    Category
    Heisenberg
  6. Item
    Undermines the idea of a definite orbit
    Category
    Heisenberg
Categories
  1. Item
    Pauli
  2. Item
    Hund
  3. Item
    Heisenberg
Three named principles govern different things. Source: syllabus Chemistry Part I, Ch 2 Structure of Atom.

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