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B.Sc Biochemistry Classification of Elements — practice questions

Explore 38 free Classification of Elements questions in B.Sc Biochemistry 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 38.

According to VSEPR theory, the shape of a molecule is determined byRead the answer and worked solution →The hybridisation of carbon in methane (CH₄) isRead the answer and worked solution →Which molecule is non-polar despite having polar bonds?Read the answer and worked solution →The bond order of the oxygen molecule O₂ (by molecular orbital theory) isRead the answer and worked solution →A coordinate (dative) bond differs from a normal covalent bond in thatRead the answer and worked solution →Which species has sp hybridisation on the central atom?Read the answer and worked solution →As bond order increases, bond lengthRead the answer and worked solution →An ionic bond forms byRead the answer and worked solution →The shape of NH₃ is pyramidal rather than planar becauseRead the answer and worked solution →Which has the highest dipole moment?Read the answer and worked solution →Among the following, which is paramagnetic?Read the answer and worked solution →Formal charge on an atom =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 →

Worked practice questions

According to VSEPR theory, the shape of a molecule is determined by

  1. the colour of the element
  2. temperature
  3. repulsion between electron pairs around the central atom
  4. the atomic mass
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Correct answer: C. repulsion between electron pairs around the central atom

VSEPR: electron pairs (bonding + lone) arrange to minimise repulsion, fixing the molecular geometry.

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The hybridisation of carbon in methane (CH₄) is

  1. sp
  2. sp³
  3. sp³d
  4. sp²
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Correct answer: B. sp³

Four sigma bonds, tetrahedral → sp³ hybridisation.

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Which molecule is non-polar despite having polar bonds?

  1. HCl
  2. H₂O
  3. NH₃
  4. CO₂
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Correct answer: D. CO₂

CO₂ is linear and symmetric, so the two C=O bond dipoles cancel → net zero dipole. H₂O and NH₃ are bent/pyramidal (net dipole).

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