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DSSSB TGT Atoms and Elements — practice questions — page 2

Explore 42 free Atoms and Elements questions in DSSSB TGT 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 31–42 of 42.

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

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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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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