Total Marks: 65
Time Allowed: 2 Hours 20 Minutes
Section A: MCQs (12 Marks, 20 Minutes)
(Each MCQ carries 1 mark.)
1. What is the molecular formula of ethanoic acid?
a) CH₄
b) C₂H₄O₂
c) C₂H₆O
d) C₆H₆
2. Which gas is produced when calcium carbonate reacts with hydrochloric acid?
a) Oxygen
b) Carbon dioxide
c) Hydrogen
d) Nitrogen
3. What is the oxidation state of sulfur in H₂SO₄?
a) +2
b) +4
c) +6
d) -2
4. Which metal is extracted using the Hall-Héroult process?
a) Iron
b) Copper
c) Aluminum
d) Zinc
5. What is the major component of natural gas?
a) Ethane
b) Propane
c) Methane
d) Butane
6. What is the chemical formula of quicklime?
a) Ca(OH)₂
b) CaCO₃
c) CaO
d) CaCl₂
7. Which process is used to convert unsaturated fats into saturated fats?
a) Cracking
b) Hydrogenation
c) Esterification
d) Fermentation
8. What is the function of silica in the blast furnace?
a) Acts as a catalyst
b) Reduces iron ore
c) Forms slag
d) Provides heat
9. Which compound is used to disinfect water?
a) Sodium chloride
b) Calcium chloride
c) Chlorine
d) Sodium sulfate
10. What is the role of limestone in the manufacture of glass?
a) Neutralization
b) Provides silica
c) Increases transparency
d) Reduces melting point
11. Which polymer is used in making plastic bottles?
a) Polyvinyl chloride
b) Polystyrene
c) Polyethylene terephthalate (PET)
d) Bakelite
12. What is the function of cryolite in aluminum extraction?
a) Reduces melting point
b) Acts as a catalyst
c) Removes impurities
d) Produces oxygen
Section B: Short Questions (33 Marks)
(Attempt any 11 questions, each question carries 3 marks. Each question has an OR option.)
1. Define electrolytes and give an example. OR Write the reaction occurring at the cathode during electrolysis of NaCl.
2. What is the difference between a strong and weak acid? OR Explain why sulfuric acid is called the king of chemicals.
3. Write a balanced equation for the reaction of calcium carbonate with hydrochloric acid. OR Explain the role of carbon dioxide in the carbon cycle.
4. What are the uses of sulfuric acid? OR Write the reaction for the preparation of sulfur dioxide.
5. How does ethanol react with sodium metal? OR Write the reaction for ethanol combustion.
6. What happens when chlorine reacts with water? OR Write the reaction for the preparation of chlorine gas.
7. What are isotopes? Give an example. OR Define atomic number and mass number.
8. Write the reaction for the reduction of iron oxide in the blast furnace. OR Explain the role of coke in iron extraction.
9. How does soap remove grease from clothes? OR What is the difference between soap and detergent?
10. Define thermoplastic and thermosetting plastics. OR Give two examples of biodegradable plastics.
11. Write the reaction for the formation of acid rain. OR What is the impact of acid rain on marine life?
Section C: Long Questions (20 Marks, Each Question = 5 Marks)
(Attempt any 4 questions, each question carries 5 marks and is divided into three parts (a, b, c)
Q1.
a) Write the balanced reaction for ammonia production in the Haber process. (2 marks)
b) What are the optimum conditions for ammonia production? (2 marks)
c) Why is ammonia liquefied in its separation process? (1 mark)
OR
a) Explain the process of electrolysis of brine. (2 marks)
b) Write the reaction at the anode during electrolysis of brine. (2 marks)
c) Name two industrial uses of chlorine. (1 mark)
Q2.
a) Write the structural formula of ethene. (2 marks)
b) What happens when ethene is passed through bromine water? (2 marks)
c) Why do alkanes burn with a blue flame? (1 mark)
OR
a) What is a polymer? Give an example. (2 marks)
b) Write a reaction for the formation of polyethylene. (2 marks)
c) Name one synthetic fiber. (1 mark)
Q3.
a) Explain why copper is a good conductor of electricity. (2 marks)
b) Write the balanced reaction for electrolysis of molten aluminum oxide. (2 marks)
c) Why is aluminum used in aircraft manufacturing? (1 mark)
OR
a) What is galvanization? (2 marks)
b) Why is zinc preferred for galvanizing iron? (2 marks)
c) Name one use of galvanized iron. (1 mark)
Q4.
a) What is the greenhouse effect? (2 marks)
b) How does carbon dioxide contribute to global warming? (2 marks)
c) Name one renewable energy source. (1 mark)
OR
a) What are CFCs? (2 marks)
b) How do CFCs deplete the ozone layer? (2 marks)
c) Name one alternative to CFCs. (1 mark)