Chemistry — Important Questions
Chapter-wise important questions for TS Intermediate 2nd Year Chemistry — organised by VSAQ, SAQ, and LAQ as per the TGBIE exam pattern. Paper: 60 marks · 3 hours.
VSAQ(2 marks each)
Answer in 2–3 lines. Attempt all 10.
- 1.[Solid State]What is a unit cell? Name the seven crystal systems.
- 2.[Solutions]Define molality. How does it differ from molarity when temperature changes?
- 3.[Electrochemistry]Define specific conductance. How does it change with temperature for metals and electrolytes?
- 4.[Electrochemistry]What is Kohlrausch's law of independent migration of ions?
- 5.[p-Block]Why does NO₂ dimerize to form N₂O₄?
- 6.[p-Block]Arrange the hydrides of Group 16 (H₂O, H₂S, H₂Se, H₂Te) in increasing order of boiling point with reason.
- 7.[d & f Block]Why do transition metals show variable oxidation states?
- 8.[Coordination]Write the IUPAC name of [Co(NH₃)₅Cl]²⁺.
- 9.[Haloalkanes]What is the Finkelstein reaction? Give an example.
- 10.[Organic N]What is the carbylamine reaction? Which class of amines gives it?
SAQ(4 marks each)
Answer in 5–7 lines. Equations and structural formulas required. Choose 6 from 8.
- 1.[Electrochemistry]Write the Nernst equation. For the cell Zn | ZnSO₄ (0.1 M) || CuSO₄ (0.1 M) | Cu, calculate E_cell given E°_cell = 1.10 V.
- 2.[Solutions]Calculate the depression in freezing point when 9.5 g of MgCl₂ is dissolved in 200 g of water. Kf = 1.86 K kg/mol.
- 3.[p-Block]Give the preparation, properties and uses of sulphuric acid.
- 4.[p-Block]Describe the structure and properties of XeF₂ and XeF₄. Draw their shapes using VSEPR theory.
- 5.[Coordination Compounds]What is crystal field theory? Explain splitting of d-orbitals in an octahedral crystal field.
- 6.[Haloalkanes]Explain SN1 and SN2 mechanisms with examples. Which type of alkyl halide favours each?
- 7.[Organic O]Explain Tollens' test, Fehling's test and iodoform reaction for aldehydes and ketones.
- 8.[Organic N]How are diazonium salts prepared? Give Sandmeyer, Gattermann, and Balz-Schiemann reactions.
LAQ(8 marks each)
Full answer required including mechanism/derivation where asked. Choose 2 from 4.
- 1.[Electrochemistry]Explain the electrochemical series. How is E°_cell calculated from standard electrode potentials? Derive the relationship between ΔG° and E°_cell, and between E°_cell and equilibrium constant K.
- 2.[p-Block Elements]Discuss the chemistry of nitrogen (Group 15): allotropes, hydrides (NH₃, N₂H₄), oxides (NO, NO₂, N₂O₅), and oxyacids. Give the Ostwald process for HNO₃ manufacture.
- 3.[Organic Compounds (C,H,O)]Give the mechanisms of Aldol condensation and Cannizzaro reaction. Explain the iodoform test and its significance. Give the industrial preparation of ethanol.
- 4.[Haloalkanes / Organic N]Write the mechanism of SN1 and SN2 reactions with stereochemical outcomes. Describe the preparation and reactions of diazonium salts (Sandmeyer, coupling, reduction).