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Indian Navy Pilot Classification of Elements — practice questions

Explore 53 free Classification of Elements questions in Indian Navy Pilot Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Classification of Elements questions and exercises with answers

Showing questions 1–30 of 53.

The radius of the $n$-th Bohr orbit of a hydrogen-like atom of atomic number $Z$ varies as:Read the answer and worked solution →Which trend is followed by ionisation energy across a period?Read the answer and worked solution →Three elements B, Si and Ge areRead the answer and worked solution →Order the atomic models as they were proposedRead the answer and worked solution →Match each scientist to their modelRead the answer and worked solution →Match each model to what it could NOT explainRead the answer and worked solution →True or false: Rutherford's modelRead the answer and worked solution →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 →

Worked practice questions

The radius of the $n$-th Bohr orbit of a hydrogen-like atom of atomic number $Z$ varies as:

  1. $r \propto n / Z^2$
  2. $r \propto Z / n^2$
  3. $r \propto n^2 / Z$
  4. $r \propto Z n^2$
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Correct answer: C. $r \propto n^2 / Z$

From Bohr's derivation, $r_n = \dfrac{n^2 h^2}{4\pi^2 m k Z e^2}$, hence $r_n \propto n^2 / Z$. **Therefore higher orbits are larger ($n^2$) and higher-$Z$ atoms hold their electrons in tighter orbits ($1/Z$).**

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Which trend is followed by ionisation energy across a period?

  1. Continuously increases
  2. Generally increases with some dips
  3. Continuously decreases
  4. Has no clear pattern in the standard view
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Correct answer: B. Generally increases with some dips

1. Ionisation energy rises with nuclear charge across a period. 2. There are exceptions where the configuration is especially stable. 3. Group 13 dips below Group 2; Group 16 dips below Group 15. 4. So the trend is rising overall with small dips at known positions. 5. Hence the general statement 'increases with some dips' is correct. _Source: syllabus Science Ch 5 'Periodic Classification of Elements'_

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Three elements B, Si and Ge are

  1. metals
  2. non-metals
  3. metal, non-metal and metalloid respectively
  4. metalloids
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Correct answer: D. metalloids

This Periodic Classification of Elements item tests a core Chemistry concept. Correct answer: metalloids. _Source: syllabus Exemplar Science Class 10_

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