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TGBIE · 2nd Year · MPC & BiPC

Chemistry — Exam Writing Tips

How to write named reactions, organic mechanisms, inorganic answers and numericals in the TS Inter 2nd Year Chemistry board exam. 60 marks · 3 hours.

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Named Reaction Writing

  1. State the reaction name and its definition in one sentence first
  2. Write the balanced chemical equation with reactants → products (include conditions above arrow)
  3. Identify the type of mechanism (addition, substitution, elimination) and mention it
  4. For multi-step reactions: number each step and write the intermediate
  5. End with: 'This is called the [name] reaction' — examiners look for this confirmation
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Organic Mechanism Writing

  1. Draw curly arrows for electron movement — marks are given per correct arrow
  2. Show the carbocation or carbanion intermediate if the mechanism involves one
  3. Label nucleophile and electrophile at the start of the mechanism
  4. For SN1 vs SN2: state which mechanism and why (degree of carbon, steric factor)
  5. End with the product — box or underline it
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Inorganic (p-Block, d-Block) Writing

  1. Write the electronic configuration of the element before describing its chemistry
  2. For oxoacid structures: draw the Lewis structure with formal charges if asked
  3. For IUPAC naming of coordination compounds: follow the strict naming order (ligands alphabetically before metal)
  4. For industrial processes: state the raw materials, catalyst, temperature, and equation
  5. XeF₂, XeF₄ structures — draw with lone pairs and bond pairs explicitly
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Numerical Answer Writing

  1. 'Given:' → list data with symbols and units
  2. 'Formula:' → write the relevant equation
  3. Substitute — include units in every step
  4. 'Answer:' → box the final value with units and correct sig figs
  5. For Nernst equation: show E° calculation, then substitute Q — two visible steps
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VSAQ and Short Answers

  1. VSAQ (2 marks): 2–3 lines, direct answer — no preamble
  2. SAQ (4 marks): 5–8 lines, include one equation or structure
  3. Never leave a VSAQ blank — even a partial answer may earn a mark
  4. For 'give reasons' questions: state the fact, then the reason on a new line
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