Total Marks: 65
Time Allowed: 2 Hours 20 Minutes
Section A: MCQs (12 Marks, 20 Minutes)
(Each MCQ carries 1 mark.)
1. Which of the following is an alkali metal?
a) Magnesium
b) Calcium
c) Sodium
d) Iron
2. What is the empirical formula of glucose (C₆H₁₂O₆)?
a) CHO
b) C₆H₁₂O₆
c) CH₂O
d) C₂H₄O₂
3. What is the main ore of aluminum?
a) Hematite
b) Bauxite
c) Galena
d) Magnetite
4. What is the molecular formula of ethanol?
a) C₂H₆
b) C₂H₅OH
c) C₃H₈O
d) CH₃OH
5. Which process is used to separate petroleum fractions?
a) Filtration
b) Electrolysis
c) Fractional distillation
d) Sedimentation
6. What is the charge on a sulfate ion (SO₄)?
a) +1
b) -1
c) -2
d) +2
7. Which gas is released when zinc reacts with hydrochloric acid?
a) Oxygen
b) Nitrogen
c) Hydrogen
d) Carbon dioxide
8. What happens when calcium hydroxide reacts with carbon dioxide?
a) No reaction
b) Formation of calcium carbonate
c) Release of hydrogen gas
d) Formation of sodium chloride
9. Which element is used as a reducing agent in the thermite reaction?
a) Aluminum
b) Iron
c) Copper
d) Lead
10. The process of breaking down large hydrocarbons into smaller ones is called:
a) Hydrogenation
b) Cracking
c) Distillation
d) Fermentation
11. What type of reaction is Fe + CuSO₄ → FeSO₄ + Cu?
a) Decomposition
b) Combination
c) Displacement
d) Neutralization
12. What is the main cause of acid rain?
a) Carbon monoxide
b) Sulfur dioxide
c) Nitrogen
d) Ozone
Section B: Short Questions (33 Marks)
(Attempt any 11 questions, each question carries 3 marks. Each question has an OR option.)
1. What is an exothermic reaction? Give an example. OR Write the balanced equation for the reaction of methane with oxygen.
2. What is electrolysis? OR Write the reaction occurring at the anode during the electrolysis of CuSO₄.
3. Define allotropy and give two examples. OR What is the structure of graphite?
4. Explain how rusting of iron occurs. OR Write a chemical equation for rust formation.
5. Describe the process of hydrogenation of vegetable oil. OR Write the reaction of ethene with hydrogen.
6. What happens when sodium hydroxide reacts with hydrochloric acid? OR Write the balanced reaction for H₂SO₄ with NaOH.
7. What are hydrocarbons? Give examples. OR Write the structural formula of ethene and ethyne.
8. Define polymerization. OR Write the equation for the formation of polyethylene.
9. Explain the environmental impact of plastic waste. OR What are biodegradable polymers?
10. How is chlorine gas prepared in the lab? OR Write the reaction for chlorine with sodium hydroxide.
11. What happens when calcium carbonate is strongly heated? OR Write the balanced equation for the reaction of quicklime with water.
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 the Contact Process. (2 marks)
b) What is the role of vanadium pentoxide in the Contact Process? (2 marks)
c) How is sulfuric acid used in the fertilizer industry? (1 mark)
OR
a) Write the balanced reaction for the Haber Process. (2 marks)
b) How does temperature affect ammonia yield? (2 marks)
c) Why is ammonia important for agriculture? (1 mark)
Q2.
a) Write the reaction for ethanol oxidation to ethanoic acid. (2 marks)
b) How does ethene react with water? (2 marks)
c) What is esterification? (1 mark)
OR
a) What is the difference between alkanes and alkenes? (2 marks)
b) Write the balanced equation for the combustion of butane. (2 marks)
c) What are the uses of ethanol? (1 mark)
Q3.
a) Write the balanced equation for electrolysis of molten NaCl. (2 marks)
b) Explain why aluminum is extracted using electrolysis. (2 marks)
c) Why is cryolite used in aluminum extraction? (1 mark)
OR
a) Write the reaction for rust formation. (2 marks)
b) Why is zinc used to protect iron from rusting? (2 marks)
c) What is galvanization? (1 mark)
Q4.
a) Write the balanced equation for acid rain formation. (2 marks)
b) Explain the impact of acid rain on soil and plants. (2 marks)
c) What steps can be taken to reduce acid rain? (1 mark)
OR
a) How do CFCs destroy the ozone layer? (2 marks)
b) What is the greenhouse effect? (2 marks)
c) How does carbon dioxide contribute to global warming? (1 mark)