Question Paper: Chemical Compounds and Their Uses | FREE PDF Download

Subject: Chemistry
Topic: Chemical Compounds and Their Uses
Time: 1.5 Hours
Maximum Marks: 50

Section A: Multiple Choice Questions (1 × 10 = 10 marks)

Choose the correct answer from the options provided.

1. Which compound is commonly known as baking soda?
   a) NaOH
   b) CaCO₃
   c) NaHCO₃
   d) Na₂CO₃

2. What is the chemical formula of washing soda?
   a) NaHCO₃
   b) NaCl
   c) Na₂CO₃
   d) NaOH

3. The compound used in making Plaster of Paris is:
   a) CaCO₃
   b) CaSO₄·½H₂O
   c) CaOCl₂
   d) CaCl₂

4. Which gas is commonly known as laughing gas?
   a) CO₂
   b) CH₄
   c) N₂O
   d) NO₂

5. Which compound is used in vinegar?
   a) Acetic Acid
   b) Formic Acid
   c) Hydrochloric Acid
   d) Sulphuric Acid

6. Ethyne is commonly known as:
   a) Acetylene
   b) Ethene
   c) Propane
   d) Methane

7. Which of the following is used in fire extinguishers?
   a) NaOH
   b) NaHCO₃
   c) NH₃
   d) HCl

8. Glucose is an example of:
   a) Protein
   b) Aldohexose
   c) Fatty acid
   d) Ketone

9. What is the chemical formula of red lead (Sindur)?
   a) PbO
   b) Pb₃O₄
   c) PbO₂
   d) Pb₂O₃

10. Dry Ice is:
    a) Frozen oxygen
    b) Liquid nitrogen
    c) Solid carbon dioxide
    d) Solid hydrogen

Section B: Short Answer Questions (3 × 5 = 15 marks)

Answer any five of the following questions briefly.

1. Write the chemical name and formula of bleaching powder.

2. What is the difference between ethene and ethyne?

3. Mention any two uses of sodium bicarbonate.

4. What is the chemical formula of tear gas, and where is it used?

5. Define blue vitriol and mention its chemical formula.

6. What is meant by “vitriol”? Name three types with their chemical formulas.

Section C: Long Answer Questions (5 × 5 = 25 marks)

Answer any five of the following questions in detail.

1. Explain the use and chemical composition of baking soda, washing soda, and caustic soda.

2. Compare and contrast alkanes and alkenes with examples and general formulas.

3. Write a note on plaster of Paris: preparation, formula, and uses.

4. Describe the roles of nitrous oxide and tear gas in the real world.

5. Explain the differences in chemical composition and application between black and red copper oxides.

6. Discuss the importance of urea in agriculture and its chemical composition.

7. Write short notes on the following:

   • Dry Ice

   • Sindur (Red Lead)

   • Acetic Acid

   • Glucose

   • White Gold

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