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Indian Navy SSR p-Block Elements — practice questions

Explore 52 free p-Block Elements questions in Indian Navy SSR Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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p-Block Elements questions and exercises with answers

Showing questions 1–30 of 52.

NH₃ shape:Read the answer and worked solution →As per your syllabus, the MODERN periodic law (post-Moseley 1913) states that properties of elements are a periodic function of which quantity?Read 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 →Ionic or covalent?Read the answer and worked solution →

Worked practice questions

NH₃ shape:

  1. Square planar
  2. Linear
  3. Tetrahedral
  4. Trigonal pyramidal (sp³ with 1 lone pair)
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Correct answer: D. Trigonal pyramidal (sp³ with 1 lone pair)

NH₃: sp³ N with 3 bond pairs + 1 lone pair. Geometry = trigonal pyramidal. Bond angle ≈ 107° (slightly less than tetrahedral 109.5° due to LP-BP repulsion). Lone pair makes N a Lewis base/nucleophile.

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As per your syllabus, the MODERN periodic law (post-Moseley 1913) states that properties of elements are a periodic function of which quantity?

  1. Density
  2. Atomic volume
  3. Atomic mass
  4. Atomic NUMBER
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Correct answer: D. Atomic NUMBER

As per your syllabus, Moseley's X-ray spectra showed Z is more fundamental than atomic mass. **Hence Modern Periodic Law uses atomic number.**

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Order the atomic models as they were proposed

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Steps
  1. Dalton: the atom is the ultimate indivisible particle
  2. Thomson: a sphere of positive charge with electrons embedded
  3. Rutherford: a tiny dense nucleus with electrons revolving around it
  4. Bohr: electrons in fixed circular orbits of definite energy
  5. Schrodinger: a wave equation giving energy states and orbitals
syllabus walks through them in this order, each answering what the previous one could not: Dalton 1808, Thomson 1898, Rutherford 1909, Bohr 1913, Schrodinger 1926. Source: syllabus Chemistry Part I, Ch 2 Structure of Atom.

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More Chemistry topics

Organic ChemistryAlkenesAlcohols Phenols EthersPolymersChemical EquilibriumThe p-Block ElementsAtoms and MoleculesClassification of Elements