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PUCET (Punjab) Surface Chemistry — practice questions — page 3

Explore 106 free Surface Chemistry questions in PUCET (Punjab) Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Surface Chemistry questions and exercises with answers

Showing questions 61–90 of 106.

True or false: Bohr's modelRead the answer and worked solution →Complete the reason Bohr's model failsRead the answer and worked solution →Which model does this belong to?Read the answer and worked solution →Match each quantum number to what it is calledRead the answer and worked solution →True or false: the quantum mechanical modelRead the answer and worked solution →Order the structure: from atom down to electronRead the answer and worked solution →Complete the (n + l) ruleRead the answer and worked solution →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 →Match each scientist to their contributionRead the answer and worked solution →Ionic or covalent?Read the answer and worked solution →Complete the driver of bond formationRead the answer and worked solution →Single, double and triple bondsRead the answer and worked solution →True or false: Lewis structuresRead the answer and worked solution →Complete the definition of resonanceRead the answer and worked solution →Tap every bond parameter the chapter namesRead the answer and worked solution →True or false: ionic solidsRead the answer and worked solution →

Worked practice questions

True or false: Bohr's model

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Questions
  1. Statement is true
    Yes
    Statement
    Bohr explained the spectrum of the hydrogen atom.
  2. Statement is true
    No
    Statement
    Bohr's model works equally well for multi-electron atoms.
  3. Statement is true
    Yes
    Statement
    Bohr allowed only certain orbits, each with a specific energy.
  4. Statement is true
    No
    Statement
    Bohr's model accounts for the wave nature of the electron.
  5. Statement is true
    Yes
    Statement
    Bohr's model contradicts the Heisenberg uncertainty principle.
It fixed hydrogen and broke on everything else. Source: syllabus Chemistry Part I, Ch 2 Structure of Atom.

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Complete the reason Bohr's model fails

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Missing parts
  1. Answer
    position
    Choices
    1. position
    2. mass
    3. charge
  2. Answer
    velocity
    Choices
    1. velocity
    2. energy
    3. spin
  3. Answer
    Heisenberg uncertainty
    Choices
    1. Heisenberg uncertainty
    2. Pauli exclusion
    3. Aufbau
Complete the statement
A clearly defined orbit requires knowing the electron's exact {0} and exact {1} at the same time. The {2} principle says that is impossible.
A well-defined orbit needs both position and velocity known at once, which the uncertainty principle forbids. Source: syllabus Chemistry Part I, Ch 2 Structure of Atom.

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Which model does this belong to?

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Items
  1. Item
    Electrons embedded in positive charge
    Category
    Thomson
  2. Item
    Mass spread evenly through the atom
    Category
    Thomson
  3. Item
    A tiny dense nucleus
    Category
    Rutherford
  4. Item
    Based on alpha-particle scattering
    Category
    Rutherford
  5. Item
    Only certain orbits are allowed
    Category
    Bohr
  6. Item
    Each orbit has a fixed energy
    Category
    Bohr
Categories
  1. Item
    Thomson
  2. Item
    Rutherford
  3. Item
    Bohr
Three models, three distinct pictures of where the electron is. Source: syllabus Chemistry Part I, Ch 2 Structure of Atom.

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