Total Marks: 65
Time Allowed: 2 Hours 20 Minutes
Section A: MCQs (12 Marks, 20 Minutes)
1. The atomic number of oxygen is:
a) 6
b) 7
c) 8
d) 9
2. Which type of bond is formed between metals and non-metals?
a) Covalent bond
b) Ionic bond
c) Metallic bond
d) Hydrogen bond
3. The molecular formula of ammonia is:
a) NH
b) NH₂
c) N₂H₄
d) NH₄
4. pH of an acidic solution is:
a) Less than 7
b) Equal to 7
c) Greater than 7
d) None of these
5. The functional group of alcohols is:
a) –OH
b) –COH
c) –CHO
d) –CO–
6. Which element has the highest ionization energy?
a) Oxygen
b) Fluorine
c) Neon
d) Lithium
7. Which of the following is a non-metal?
a) Sodium
b) Magnesium
c) Sulfur
d) Aluminum
8. The chemical formula of lime water is:
a) CaO
b) Ca(OH)₂
c) CaCO₃
d) CaCl₂
9. The metal used in the electroplating of iron is:
a) Copper
b) Zinc
c) Aluminum
d) Lead
10. What is the nature of oxides of non-metals?
a) Basic
b) Amphoteric
c) Acidic
d) Neutral
11. The process of converting a gas directly into a solid is called:
a) Melting
b) Condensation
c) Sublimation
d) Deposition
12. Which gas is released when an acid reacts with a metal?
a) Oxygen
b) Hydrogen
c) Carbon dioxide
d) Nitrogen
Section B: Short Questions (33 Marks)
(Attempt any 11 questions, each question carries 3 marks.11×3=33)
1.Write a balanced equation for the combustion of ethene.
OR
Explain the reaction of methane with chlorine in sunlight.
2. What happens when ethanol is oxidized? Write the reaction.
OR
Give the reaction of acetic acid with sodium bicarbonate.
3. Define electrolysis and write the reaction occurring in the electrolysis of molten NaCl.
OR
Write the ionic equations for the electrolysis of aqueous CuSO₄ using graphite electrodes.
4. Write the balanced equation for the preparation of ammonia by the Haber process.
OR
Give the chemical reactions involved in the Contact Process.
5. Explain the process of saponification with an equation.
OR
Write the balanced chemical reaction for the hydrolysis of esters.
6. Write the chemical equation for the reaction between zinc and sulfuric acid.
OR
Explain the reaction between iron and chlorine gas with a balanced equation.
7. Describe the reaction of sodium metal with water.
OR
Write the balanced chemical equation for the neutralization of HCl with NaOH.
8. What happens when calcium carbonate is heated? Write the chemical equation.
OR
Explain the reaction between quicklime and water with an equation.
9. Explain the process of cracking of alkanes with a chemical equation.
OR
Write the balanced equation for the polymerization of ethene to polyethylene.
10. Describe the process of electroplating of copper with a reaction equation.
OR
Write the balanced equation for the reduction of iron ore in the blast furnace.
11. How does aluminum react with hydrochloric acid? Write the equation.
OR
Write a chemical reaction to show the amphoteric nature of aluminum oxide.
Section C: Long Questions (20 Marks)
(Attempt all 4 questions, each question carries 5 marks and is divided into parts (a, b, c)
Q1.
a) Write the balanced equation for the production of ammonia using the Haber process. (2 marks)
b) Explain the role of temperature and pressure in the Haber process. (2 marks)
c) What happens when ammonia reacts with water? Write the equation. (1 mark)
OR
a) Write the balanced reaction for the Contact Process. (2 marks)
b) Explain why vanadium pentoxide (V₂O₅) is used as a catalyst. (2 marks)
c) What happens when sulfuric acid reacts with copper? (1 mark)
Q2.
a) Write the reaction equation for the oxidation of ethanol to ethanoic acid. (2 marks)
b) How do alcohols react with sodium? Write the reaction. (2 marks)
c) Explain how esters are formed. (1 mark)
OR
a) Write the balanced equation for the polymerization of ethene. (2 marks)
b) Explain the difference between addition and condensation polymerization. (2 marks)
c) What happens when glucose undergoes fermentation? Write the reaction. (1 mark)
Q3.
a) Write the reaction for the electrolysis of molten NaCl. (2 marks)
b) Explain the role of cryolite in aluminum extraction. (2 marks)
c) Describe the rusting of iron with an equation. (1 mark)
OR
a) Write the reaction occurring at the cathode in the electrolysis of CuSO₄. (2 marks)
b) Explain why copper does not react with dilute acids. (2 marks)
c) How is zinc extracted from zinc oxide? Write the reaction. (1 mark)
Q4.
a) Write the balanced reaction for the formation of ozone from oxygen. (2 marks)
b) Explain how greenhouse gases contribute to global warming. (2 marks)
c) Describe the harmful effects of acid rain. (1 mark)
OR
a) Write the reaction for the decomposition of limestone in cement production. (2 marks)
b) Explain the role of catalytic converters in reducing pollution. (2 marks)
c) Describe the impact of CFCs on the ozone layer. (1 mark)