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Indian Navy SSR (Sailor) Atomic Structure and Valency — practice questions

Explore 29 free Atomic Structure and Valency questions in Indian Navy SSR (Sailor) Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Atomic Structure and Valency questions and exercises with answers

Showing questions 1–29 of 29.

For a hydrogen-like atom of nuclear charge $Z$, the radius of the $n$th Bohr orbit scales asRead the answer and worked solution →An electron is accelerated through a potential difference of $100\,V$. Its de Broglie wavelength is approximatelyRead the answer and worked solution →As per your syllabus, what is the MOLECULAR MASS of methane (CH₄) — using C = 12.011 u and H = 1.008 u?Read the answer and worked solution →As per your syllabus, the charge-to-mass ratio e/m_e of the electron, measured by J.J. Thomson in 1897, is which value?Read the answer and worked solution →The de Broglie wavelength of a particle with momentum p is: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 →True or false: resonanceRead the answer and worked solution →Order the steps: draw a Lewis structureRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Assertion and reason: structureRead the answer and worked solution →Flip and pair: parameter with what it measuresRead the answer and worked solution →

Worked practice questions

For a hydrogen-like atom of nuclear charge $Z$, the radius of the $n$th Bohr orbit scales as

  1. $r_n \propto nZ$
  2. $r_n \propto n^2/Z$
  3. $r_n \propto Z/n^2$
  4. $r_n \propto n/Z^2$
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Correct answer: B. $r_n \propto n^2/Z$

$r_n = (0.529\,Å)\,n^2/Z$. **So radius grows as $n^2$ but shrinks as $Z$ — explaining why He$^+$ has a smaller $n=1$ orbit than H.**

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An electron is accelerated through a potential difference of $100\,V$. Its de Broglie wavelength is approximately

  1. $1.23\,Å$
  2. $12.3\,Å$
  3. $0.0123\,Å$
  4. $0.123\,Å$
Show answer and solution

Correct answer: A. $1.23\,Å$

For an electron accelerated through $V$ volts, $\lambda = \dfrac{12.27}{\sqrt{V}}\,Å$. With $V = 100$: $\lambda = 12.27/10 \approx 1.23\,Å$. This is comparable to atomic spacings — basis of electron diffraction.

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As per your syllabus, what is the MOLECULAR MASS of methane (CH₄) — using C = 12.011 u and H = 1.008 u?

  1. 17 u
  2. 20 u
  3. 16.043 u (= 12.011 + 4 × 1.008)
  4. 12 u
Show answer and solution

Correct answer: C. 16.043 u (= 12.011 + 4 × 1.008)

As per your syllabus, example, CH₄ molecular mass = 12.011 + 4(1.008) = 16.043 u.

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More Chemistry topics

Chemical EquilibriumOrganic ChemistryThe p-Block ElementsAlcohols Phenols EthersAtoms and MoleculesClassification of Elementsp-Block ElementsPolymers