Total Marks: 65
Time Allowed: 2 Hours 20 Minutes
Section A: MCQs (12 Marks, 20 Minutes)
1. Which gas is released when acids react with carbonates?
a) Oxygen
b) Hydrogen
c) Carbon dioxide
d) Nitrogen=
2. What is the molecular formula of benzene?
a) C₂H₄
b) C₃H₆
c) C₆H₆
d) C₄H₈
3. Which element has the highest electronegativity?
a) Oxygen
b) Nitrogen
c) Fluorine
d) Chlorine
4. What is the major constituent of natural gas
a) Butane
b) Propane
c) Methane
d) Ethane
5. What is the IUPAC name of CH₃COOH?
a) Methanoic acid
b) Ethanoic acid
c) Propanoic acid
d) Butanoic acid
6. Rusting of iron is an example of:
a) Combustion
b) Oxidation
c) Reduction
d) Neutralization
7. What is the chemical formula of washing soda?
a) NaHCO₃
b) Na₂CO₃
c) NaCl
d) Na₂SO₄
8. Which polymer is used for making non-stick cookware?
a) Nylon
b) Teflon
c) Polythene
d) PVC
9. The major source of nitrogen oxides in the atmosphere is:
a) Volcanoes
b) Industrial emissions
c) Burning of fossil fuels
d) Deforestation
10. Which of the following is an example of a biofuel?
a) Coal
b) Petroleum
c) Ethanol
d) Natural gas
11. The process of separating petroleum into different fractions is called:
a) Cracking
b) Fractional distillation
c) Filtration
d) Electrolysis
12. What is the function of a catalyst in a chemical reaction?
a) Slows down the reaction
b) Speeds up the reaction
c) Changes the reaction products
d) Increases energy requirements
Section B: Short Questions (33 Marks)
(Attempt these questions, each question carries 3 marks.)
1. Define oxidation number. OR Explain the term “reducing agent.”
2. Write a balanced equation for the reaction of aluminum with hydrochloric acid. OR What is a displacement reaction?
3. Explain the process of polymerization. OR Give an example of a polymer and its monomer.
4. What is the role of limestone in the extraction of iron? OR What is slag?
5. Define the term “acidic oxide.” OR Give an example of a basic oxide.
6. What is meant by thermal decomposition? OR Give an example of a thermal decomposition reaction.
7. What are CFCs? OR How do CFCs affect the ozone layer?
8. What is the chemical formula of nitric acid? OR Write one use of nitric acid.
9. What are fossil fuels? OR Name one disadvantage of using fossil fuels.
10. What is meant by renewable energy? OR Give one example of a renewable energy source.
11. Explain the role of hemoglobin in blood. OR Write one function of proteins in the human body.
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 preparation of ammonia in the Haber process. (2 marks)
b) What are the conditions required for the Haber process? (2 marks)
c) Name one use of ammonia. (1 mark)
OR
a) What is the contact process? (2 marks)
b) Write the reaction for the formation of sulfur trioxide. (2 marks)
c) Name one industrial use of sulfuric acid. (1 mark)
Q2.
a) Write the structural formula of ethanol. (2 marks)
b) How does ethanol react with sodium metal? (2 marks)
c) Why is ethanol called a renewable fuel? (1 mark)
OR
a) What are the products of the combustion of butane? (2 marks)
b) How does ethene react with hydrogen? (2 marks)
c) Name one use of ethene. (1 mark)
Q3.
a) Write the balanced equation for the electrolysis of NaCl. (2 marks)
b) What are the products of the electrolysis of brine? (2 marks)
c) Name one use of chlorine gas. (1 mark)
OR
a) How does aluminum react with oxygen? (2 marks)
b) Write the balanced equation for the reaction of aluminum with hydrochloric acid. (2 marks)
c) Name one use of aluminum. (1 mark)
Q4.
a) What is meant by photochemical smog? (2 marks)
b) How do nitrogen oxides contribute to smog formation? (2 marks)
c) Name one way to reduce air pollution. (1 mark)
OR
a) What is meant by acid rain? (2 marks)
b) How does acid rain affect marine life? (2 marks)
c) Name one way to prevent acid rain. (1 mark