Total Marks: 65
Time Allowed: 2 Hours 20 Minutes
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Section A: MCQs (12 Marks, 20 Minutes)
(Each MCQ carries 1 mark.)
1. Which element is present in all organic compounds?
a) Hydrogen
b) Oxygen
c) Carbon
d) Nitrogen
2. What is the common name for calcium sulfate dihydrate?
a) Gypsum
b) Limestone
c) Quicklime
d) Slaked lime
3. Which of the following is a strong acid?
a) H₂CO₃
b) HCl
c) CH₃COOH
d) NH₃
4. The general formula for alkanes is:
a) CₙH₂ₙ₊₂
b) CₙH₂ₙ
c) CₙH₂ₙ₋₂
d) CₙH₂ₙ₊₁OH
5. What type of reaction occurs when ethene reacts with bromine?
a) Addition
b) Substitution
c) Elimination
d) Oxidation
6. Which of the following metals does not react with water?
a) Sodium
b) Potassium
c) Magnesium
d) Copper
7. What is the function of coke in the extraction of iron?
a) Acts as a catalyst
b) Reducing agent
c) Neutralizes impurities
d) Provides heat only
8. Which fraction of petroleum is used for making roads?
a) Petrol
b) Diesel
c) Bitumen
d) Kerosene
9. What is the molecular formula of benzene?
a) C₆H₆
b) C₆H₁₂
c) C₅H₁₀
d) C₆H₁₄
10. The process of removing sulfur from fuels is called:
a) Refining
b) Cracking
c) Hydrodesulfurization
d) Distillation
11. What is the role of lime in the manufacture of glass?
a) Strengthens glass
b) Reduces melting point
c) Gives color
d) Acts as a catalyst
12. What is the byproduct of the fermentation of glucose?
a) Carbon monoxide
b) Methanol
c) Ethanol
d) Acetic acid
Section B: Short Questions (33 Marks)
(Attempt any 11 questions, each question carries 3 marks. Each question has an OR option.)
1. Define redox reaction. Give an example. OR Write the oxidation and reduction half-reactions for the reaction between zinc and copper sulfate.
2. What is a catalyst? Give an example. OR Explain why catalysts are used in industrial reactions.
3. Write the balanced chemical equation for the reaction of sulfur dioxide with oxygen. OR Explain the importance of the Contact Process.
4. What are the differences between hard and soft water? OR Write a reaction showing the removal of hardness from water.
5. Explain the structure of diamond. OR Why is graphite a good conductor of electricity?
6. Write a balanced equation for the reaction of sodium carbonate with hydrochloric acid. OR Explain the preparation of washing soda.
7. How is chlorine gas produced in the laboratory? OR Write a reaction for chlorine with iron.
8. What is esterification? Write an equation. OR What happens when an ester is hydrolyzed?
9. What is the role of cryolite in aluminum extraction? OR Write the reaction for the electrolysis of molten aluminum oxide.
10. What is acid rain? Write a reaction for its formation. OR Explain two harmful effects of acid rain.
11. What are biodegradable and non-biodegradable plastics? OR Explain the environmental impact of plastic waste.
Section C: Long Questions (20 Marks, Each Question = 5 Marks)
(Attempt any 4 questions, each question carries 5 marks.
Q1.
a) Write the balanced equation for the Haber process. (2 marks)
b) What are the conditions required for the Haber process? (2 marks)
c) Why is ammonia liquefied in its separation process? (1 mark)
OR
a) Write the reaction for the manufacture of sulfuric acid. (2 marks)
b) What is the role of V₂O₅ in the Contact Process? (2 marks)
c) Name one use of sulfuric acid. (1 mark)
Q2.
a) Write the balanced equation for the combustion of ethanol. (2 marks)
b) How does ethene react with steam? Write the equation. (2 marks)
c) What is the functional group of aldehydes? (1 mark)
OR
a) Write a polymerization reaction for polyvinyl chloride (PVC). (2 marks)
b) What is the difference between addition and condensation polymers? (2 marks)
c) Name one natural polymer. (1 mark)
Q3.
a) Write the balanced equation for the reaction of iron with copper sulfate. (2 marks)
b) Explain why aluminum is corrosion-resistant. (2 marks)
c) What is an alloy? Give an example. (1 mark)
OR
a) How is iron extracted in the blast furnace? (2 marks)
b) Why is limestone added to the blast furnace? (2 marks)
c) Write one use of iron. (1 mark)
Q4.
a) Write the reaction for the decomposition of ozone. (2 marks)
b) How do CFCs damage the ozone layer? (2 marks)
c) Name one way to reduce ozone depletion. (1 mark)
OR
a) What are greenhouse gases? Name two. (2 marks)
b) How does global warming affect sea levels? (2 marks)
c) What is the role of trees in reducing carbon dioxide levels? (1 mark)