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PUCET (Punjab) Atoms and Elements — practice questions — page 4

Explore 103 free Atoms and Elements questions in PUCET (Punjab) Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Atoms and Elements questions and exercises with answers

Showing questions 91–103 of 103.

Tap every statement Hund's rule requiresRead the answer and worked solution →The fundamental particlesRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →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

Tap every statement Hund's rule requires

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Questions
  1. Items
    1. Text
      Each orbital of a subshell gets one electron first
      Matches the category
      Yes
    2. Text
      Pairing waits until all are singly occupied
      Matches the category
      Yes
    3. Text
      No two electrons share four quantum numbers
      Matches the category
      No
    4. Text
      Electrons must fill the highest orbital first
      Matches the category
      No
    Category
    Required by Hund's rule of maximum multiplicity
  2. Items
    1. Text
      No two electrons in an atom share all four quantum numbers
      Matches the category
      Yes
    2. Text
      It limits an orbital to two electrons
      Matches the category
      Yes
    3. Text
      It sets the order of filling subshells
      Matches the category
      No
    4. Text
      It forbids pairing entirely
      Matches the category
      No
    Category
    True of the PAULI exclusion principle
Hund's rule is about the ORDER of filling within one subshell. Source: syllabus Chemistry Part I, Ch 2 Structure of Atom.

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The fundamental particles

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Questions
  1. Question
    The three fundamental particles of the atom are
    Choices
    1. electrons, photons and neutrons
    2. protons, neutrons and orbitals
    3. electrons, protons and neutrons
    Correct choice
    electrons, protons and neutrons
  2. Question
    Dalton proposed his atomic theory in
    Choices
    1. 1808
    2. 1898
    3. 1913
    Correct choice
    1808
  3. Question
    Rutherford's scattering experiment was in
    Choices
    1. 1926
    2. 1909
    3. 1808
    Correct choice
    1909
  4. Question
    Schrodinger proposed his equation in
    Choices
    1. 1913
    2. 1898
    3. 1926
    Correct choice
    1926
Dalton's indivisible atom gave way to three sub-atomic particles. Source: syllabus Chemistry Part I, Ch 2 Structure of Atom.

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Assertion and reason

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Questions
  1. Reason
    It gave no account of why the revolving electron does not fall into the nucleus.
    Verdict
    Both are true; the reason explains the assertion.
    Assertion
    Rutherford's model could not explain atomic stability.
  2. Reason
    A definite orbit requires exact position and exact velocity at once.
    Verdict
    Both are true; the reason explains the assertion.
    Assertion
    Bohr's model contradicts the uncertainty principle.
  3. Reason
    Three quantum numbers describe each quantised energy state.
    Verdict
    The assertion is false and the reason is true.
    Assertion
    The quantum numbers must be assumed before solving.
  4. Reason
    Alpha-particle scattering showed the mass is concentrated, not spread.
    Verdict
    Both are true; the reason explains the assertion.
    Assertion
    Thomson's model was abandoned.
The reason must genuinely explain the assertion. Source: syllabus Chemistry Part I, Ch 2 Structure of Atom.

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