Total Marks: 65
Time Allowed: 2 Hours 20 Minutes
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Section A: MCQs (12 Marks, 20 Minutes)
1. Which of the following is an example of an exothermic reaction?
a) Melting of ice
b) Photosynthesis
c) Combustion of methane
d) Electrolysis of water
2. The functional group in alcohols is:
a) –COOH
b) –CHO
c) –OH
d) –COO–
3. Which element is the most electronegative?
a) Oxygen
b) Fluorine
c) Chlorine
d) Nitrogen
4. What is the main component of LPG?
a) Butane
b) Methane
c) Propane
d) Ethene
5. The formula of sodium carbonate is:
a) NaHCO₃
b) Na₂CO₃
c) NaOH
d) NaCl
6. Which of the following metals does not react with acids?
a) Zinc
b) Copper
c) Magnesium
d) Iron
7. The process used to separate petroleum fractions is called:
a) Cracking
b) Polymerization
c) Fermentation
d) Fractional distillation
8. What is the pH of a neutral solution?
a) 1
b) 7
c) 10
d) 14
9. Which of the following is a renewable source of energy?
a) Coal
b) Petroleum
c) Natural gas
d) Hydropower
10. The monomer of natural rubber is:
a) Ethene
b) Styrene
c) Isoprene
d) Propene
11. What is the chemical formula of sulfuric acid?
a) H₂SO₃
b) H₂SO₄
c) HCl
d) HNO₃
12. Which gas is responsible for the depletion of the ozone layer?
a) Oxygen
b) Carbon dioxide
c) CFCs
d) Sulfur dioxide
Section B: Short Questions (33 Marks)
(Attempt any 11 questions, each question carries 3 marks. Each question has an OR option.)
1. Define oxidation and reduction. OR Write the oxidation state of iron in Fe₂O₃.
2. What is meant by a homologous series? OR Give an example of an alkane and its general formula.
3. Write a balanced equation for the reaction of sodium hydroxide with hydrochloric acid. OR What is a neutralization reaction?
4. How does hard water affect soap? OR Write a reaction to remove hardness from water.
5. How is ethanol produced by fermentation? OR Write a balanced reaction for the fermentation of glucose.
6. What is the role of slag in the extraction of iron? OR Write the reaction of limestone in the blast furnace.
7. What is meant by unsaturated hydrocarbons? OR Give one test to distinguish between alkanes and alkenes.
8. Explain the process of saponification. OR Write the reaction for the formation of soap.
9. What are plastics? Give one example. OR Define biodegradable plastics and give an example.
10. How does acid rain form? OR Write one environmental effect of acid rain.
11. Explain the term “greenhouse gases” and name two examples. OR How does deforestation contribute to global warming?
Section C: Long Questions (20 Marks, Each Question = 5 Marks)
(Attempt any 4 questions, each question carries 5 marks.
Q1.
a) What is the chemical reaction in the manufacture of urea? (2 marks)
b) What are the main raw materials for urea production? (2 marks)
c) Name one use of urea. (1 mark)
OR
a) Write the balanced equation for the production of nitric acid. (2 marks)
b) What is the role of ammonia in nitric acid production? (2 marks)
c) Name one industrial use of nitric acid. (1 mark)
Q2.
a) Write the general formula for alkanes. (2 marks)
b) How does methane react with chlorine in the presence of sunlight? (2 marks)
c) Name one use of methane. (1 mark)
OR
a) What are the products of the combustion of propane? (2 marks)
b) How does ethene react with hydrogen? (2 marks)
c) Why are alkanes called saturated hydrocarbons? (1 mark)
Q3.
a) Write the balanced equation for the reaction of copper with silver nitrate. (2 marks)
b) Why is silver used in electrical circuits? (2 marks)
c) Name one use of copper. (1 mark)
OR
a) How does zinc react with hydrochloric acid? (2 marks)
b) Write the balanced equation for the reaction of iron with chlorine. (2 marks)
c) Name one property of iron. (1 mark)
Q4.
a) What is photochemical smog? (2 marks)
b) How do nitrogen oxides contribute to air pollution? (2 marks)
c) Name one way to reduce air pollution. (1 mark)
OR
a) What is ozone? (2 marks)
b) How does ozone protect life on Earth? (2 marks)
c) Name one effect of ozone depletion. (1 mark)