Time Allowed: 3 Hours
Maximum Marks: 70
General Instructions:
* All questions are compulsory.
* Section A contains 20 questions of 1 mark each.
* Section B contains 5 questions of 2 marks each.
* Section C contains 5 questions of 3 marks each.
* Section D contains 3 questions of 5 marks each.
* Use of log tables and calculators is permitted.
Section A (20 Marks)
Choose the correct answer from the given options:
1. The number of significant figures in 0.0025 is:
(a) 2 (b) 3 (c) 4 (d) 5
2. The SI unit of mass is:
(a) gram (b) kilogram (c) milligram (d) pound
3. Which of the following is a chemical change?
(a) Melting of ice (b) Burning of wood (c) Evaporation of water (d) Sublimation of camphor
4. The atomic number of an element is equal to the number of:
(a) Protons (b) Electrons (c) Neutrons (d) Both (a) and (b)
5. The electronic configuration of potassium is:
(a) 2, 8, 8, 1 (b) 2, 8, 1 (c) 2, 8, 8, 2 (d) 2, 8, 18, 1
6. The valency of nitrogen in NH₃ is:
(a) 1 (b) 2 (c) 3 (d) 4
7. The formula of sodium sulphate is:
(a) Na₂SO₃ (b) Na₂SO₄ (c) NaSO₄ (d) Na₂S
8. The pH of a neutral solution is:
(a) 0 (b) 7 (c) 14 (d) 1
9. The oxidation number of chlorine in HClO₄ is:
(a) +1 (b) +3 (c) +5 (d) +7
10. The volume of 1 mole of any gas at STP is:
(a) 11.2 L (b) 22.4 L (c) 33.6 L (d) 44.8 L
11. The number of moles of H₂SO₄ present in 98 g of H₂SO₄ is:
(a) 1 (b) 2 (c) 0.5 (d) 0.25
12. The rate of a chemical reaction is increased by:
(a) Increasing temperature (b) Increasing concentration (c) Adding catalyst (d) All of the above
13. Which of the following is a Lewis acid?
(a) NH₃ (b) H₂O (c) BF₃ (d) NaOH
14. The IUPAC name of CH₃CH₂CH₂OH is:
(a) Propanol (b) Ethanol (c) Butanol (d) Methanol
15. The general formula of alkynes is:
(a) CnH₂n+2 (b) CnH₂n (c) CnH₂n-2 (d) CnH₂n-4
16. Which of the following is an isomer of n-butane?
(a) n-pentane (b) Isobutane (c) Propane (d) Ethane
17. The functional group present in aldehydes is:
(a) -CHO (b) -COOH (c) -OH (d) -NH₂
18. The process of converting vegetable oil to vegetable ghee is called:
(a) Hydrogenation (b) Dehydration (c) Oxidation (d) Reduction
19. The monomer of polythene is:
(a) Ethene (b) Propene (c) Butene (d) Pentene
20. The reaction of an acid with a base is called:
(a) Neutralization (b) Oxidation (c) Reduction (d) Decomposition
Section B (10 Marks)
21. State the law of conservation of mass. Give one example to illustrate the law.
22. Write the electronic configurations of oxygen (atomic number 8) and potassium (atomic number 19).
23. Explain the difference between covalent and ionic bond with suitable examples.
24. What is the pH scale? What is the pH range for acidic, basic, and neutral solutions?
25. Write the IUPAC names of the following compounds:
(a) CH₃CH₂COOH (b) CH₃CH₂CH₂CHO
Section C (15 Marks)
26. Explain the postulates of Dalton's atomic theory.
27. What are isotopes? Give two examples of isotopes and explain their applications.
28. What is a chemical equation? Explain the steps involved in balancing a chemical equation.
29. Describe the factors affecting the rate of a chemical reaction.
30. Explain the mechanism of addition reaction of ethene with bromine.
Section D (20 Marks)
31. (a) Define the terms:
(i) Mole (ii) Molar mass
(b) Calculate the mass of 0.5 mole of glucose (C₆H₁₂O₆).
(c) Calculate the volume occupied by 22 g of CO₂ at STP.
32. (a) Explain the concept of electronegativity.
(b) How does electronegativity influence the type of chemical bond formed between two atoms?
(c) Arrange the following elements in increasing order of electronegativity:
O, Cl, S, N.
33. (a) What are homologous series? Explain the characteristics of homologous series.
(b) Write the structural formulae of the first four members of the alkane series.
(c) Explain the process of cracking of alkanes.
This is a model paper and the actual question paper may differ. The topics and concepts covered in this paper are indicative of the syllabus for Intermediate MPC 1st Year Chemistry. It is important to consult your textbook and other reference materials for a comprehensive understanding of the subject.
