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B.Sc Biochemistry JEE Main 2023 Mixed — practice questions — page 3

Explore 75 free JEE Main 2023 Mixed questions in B.Sc Biochemistry 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 61–75 of 75.

True or false: orbital energiesRead the answer and worked solution →Match each rule to what it forbids or requiresRead the answer and worked solution →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

True or false: orbital energies

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Questions
  1. Statement is true
    Yes
    Statement
    In hydrogen, all orbitals in a given shell have the same energy.
  2. Statement is true
    Yes
    Statement
    He⁺ and Li²⁺ behave like hydrogen in this respect.
  3. Statement is true
    Yes
    Statement
    In a multi-electron atom, orbital energy depends on n and l.
  4. Statement is true
    No
    Statement
    A higher (n + l) value means lower energy.
  5. Statement is true
    Yes
    Statement
    For equal (n + l), the lower n has the lower energy.
Hydrogen-like systems behave differently from multi-electron atoms, which is the point of the (n + l) rule. Source: syllabus Chemistry Part I, Ch 2 Structure of Atom.

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Match each rule to what it forbids or requires

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Matching pairs
  1. Left
    Pauli exclusion principle
    Right
    no two electrons share all four quantum numbers
  2. Left
    Hund's rule of maximum multiplicity
    Right
    every orbital in a subshell gets one electron before any pairs
  3. Left
    The (n + l) rule
    Right
    orbitals fill in order of increasing energy
  4. Left
    Heisenberg uncertainty principle
    Right
    position and velocity cannot both be exact
Two rules govern how electrons fill the orbitals. Source: syllabus Chemistry Part I, Ch 2 Structure of Atom.

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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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