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Indian Navy 10+2 B.Tech Cadet Atomic Structure — practice questions

Explore 35 free Atomic Structure questions in Indian Navy 10+2 B.Tech Cadet Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Atomic Structure questions and exercises with answers

Showing questions 1–30 of 35.

The minimum energy required to remove an electron from the ground state of a hydrogen atom is:Read the answer and worked solution →de Broglie wavelength of an electron with momentum p:Read the answer and worked solution →In the photoelectric effect, the kinetic energy of the ejected electron depends onRead the answer and worked solution →The longest wavelength line in the Lyman series of hydrogen corresponds to the transitionRead the answer and worked solution →The Bohr radius for hydrogen ($n=1, Z=1$) is approximatelyRead the answer and worked solution →As per your syllabus, what is the molar mass of SODIUM CHLORIDE (NaCl)?Read the answer and worked solution →As per your syllabus, the radius of the first Bohr orbit of hydrogen (n = 1) — the Bohr radius a₀ — is approximately which value?Read the answer and worked solution →As per your syllabus, eqn 2.15, the radius of the n-th Bohr orbit for a hydrogen-like ion (one electron, atomic number Z) scales as which expression?Read the answer and worked solution →As per your syllabus, the magnetic quantum number m_l takes how many values for a given azimuthal quantum number l?Read the answer and worked solution →As per your syllabus, the electron-spin quantum number m_s — introduced by Uhlenbeck and Goudsmit (1925) — takes which values?Read the answer and worked solution →Hund's rule states that electrons in degenerate orbitals:Read 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 →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 →Bonded pair or lone pair?Read the answer and worked solution →Flip and pair: term with meaningRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Order the reasoning: why resonance is neededRead the answer and worked solution →Reading the definitions backRead the answer and worked solution →True or false: what bond parameters affectRead the answer and worked solution →Bond parameters in useRead the answer and worked solution →Which parameter answers this?Read the answer and worked solution →

Worked practice questions

The minimum energy required to remove an electron from the ground state of a hydrogen atom is:

  1. $3.4\,\text{eV}$
  2. $13.6\,\text{eV}$
  3. $27.2\,\text{eV}$
  4. $1.51\,\text{eV}$
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Correct answer: B. $13.6\,\text{eV}$

Ionisation energy is the energy required to take the electron from $n = 1$ to $n = \infty$. $E_\infty - E_1 = 0 - (-13.6) = 13.6\,\text{eV}$. The value $27.2\,\text{eV}$ is the magnitude of the potential energy in the ground state, not the ionisation energy.

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de Broglie wavelength of an electron with momentum p:

  1. λ = h / p
  2. λ = p / h
  3. λ = h × p
  4. λ = h c / p
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Correct answer: A. λ = h / p

de Broglie: λ = h/p. Every particle has wavelike properties with wavelength inversely proportional to momentum. For macroscopic objects (large p), λ is unmeasurably small. For electrons, λ is comparable to atomic dimensions.

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In the photoelectric effect, the kinetic energy of the ejected electron depends on

  1. the intensity of the incident light
  2. the frequency of the incident light
  3. the colour of the metal surface
  4. the temperature of the metal
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Correct answer: B. the frequency of the incident light

$KE_{max} = h\nu - \phi$ where $\phi$ is the work function. KE depends only on *frequency* intensity only changes the *number* of ejected electrons, not their energy. This is Einstein's resolution of the photoelectric puzzle.

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