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Subjective sections are for self-practice. Attempt on paper, then reveal model answers to check your work. No auto-grading.
Section B — Short Questions
Attempt any 6 out of 9 · 8 marks each
Q.2 · (4+4) = 8 Marks
(a) Define rate of reaction. (b) Give two factors affecting the rate of reaction.
Write your answer here on paper…
(a) Rate of reaction is the change in concentration of reactant or product per unit time.
(b) Temperature, concentration, surface area, catalyst, pressure (any two with brief explanation).
(b) Temperature, concentration, surface area, catalyst, pressure (any two with brief explanation).
Q.3 · (4+4) = 8 Marks
(a) What is hybridisation? (b) Explain sp² hybridisation in ethene.
Write your answer here on paper…
(a) Mixing of atomic orbitals to form new equivalent orbitals for bonding.
(b) Carbon in ethene uses one s + two p orbitals → three sp² hybrids; trigonal planar geometry, 120° bond angle.
(b) Carbon in ethene uses one s + two p orbitals → three sp² hybrids; trigonal planar geometry, 120° bond angle.
Section C — Long Questions
Attempt any 2 out of 3 · 9 marks each part
Q.5 · (5+4) = 9 Marks
Explain the preparation, properties and uses of ethanol. Draw structural formula.
Long answer space — practise on ruled sheets as in board exam…
Preparation: fermentation, hydration of ethene. Properties: colourless liquid, miscible with water, burns with blue flame. Uses: solvent, antiseptic, fuel. Include C₂H₅OH structure diagram.