I. Select the correct option from the given choices: 1. The number of significant figures in 0.523 is a) 3 b) 4 c) 2 d) 1
2. Molarity is defined as the number of moles of solute present in a) one litre of solution b) one litre of solvent c) one kg of solution d) one kg of solvent
3. Rutherford’s α – ray scattering experiment is related to the size of the a) nucleus b) atom c) electron d) neutrons
4. Mendeleev`s periodic table is based on a) atomic weight b) atomic number c) number of neutrons d) number of electrons
5. In XeF4 molecule, number of lone pairs and shared pairs of electrons respectively are a) 4, 1 b) 2, 4 c) 4, 3 d) 4, 2
6. Which of the following is true for ionic compounds? a) conduct electricity in solid state b) have directional bonds c) soluble in polar solvents d) are non-electrolytes in molten state
7. The second law of thermodynamics introduced the concept of: a) enthalpy b) work c) entropy d) internal energy
8. The difference between heat of reaction at constant pressure and heat of reaction at constant volume is greater than RT when a) Δng = 1 b) Δng > 1 c) Δng < 1 d) Δng ≠ 1
9. If a catalyst is used in a reversible reaction, a) backward reaction becomes faster b) forward reaction becomes faster c) equilibrium constant decreases d) equilibrium is attained more quickly
10. Lewis acids are a) proton donors b) electron pair acceptors c) electron pair donors d) proton acceptors
11. During reduction, oxidation number a) increases b) decreases c) do not changes d) depends on the reaction
12. The property catenation is more marked in the case of a) silicon b) carbon c) tin d) copper
13. Methoxy methane and ethyl alcohol are a) position isomers b) chain isomers c) functional isomers d) metamers
14. According to Markownikoff’s rule, when hydrogen halides add to an unsymmetrical alkene, the hydrogen of HX attaches to a) carbon at the end of the molecule b) carbon in the middle of the molecule c) carbon with least number of hydrogen atoms d) carbon with maximum number of hydrogen atoms
15. Which of the following hydrocarbon damage DNA and cause cancer in the human body a) 1,2-Benzanthracene b) 1,2-Benzpyrene c) 3-Methylcholanthrene d) all of these
II. Fill in the blanks by choosing the appropriate word from those given in the brackets: (aromatisation, zero, increases, 8 electrons, – CH2-, – CH3) 16. The outer shell of the most stable atoms contains __________. 17. The standard enthalpy of formation of element is taken as ____________ by convention. 18. When the pH of a solution decreases, its hydrogen ion concentration is ________. 19. In a homologous series of aliphatic hydrocarbons, the successive members differ from each other in molecular formula by a _______ group. 20. n-Hexane on heating to 773K, under 10-20atm pressure in the presence of oxides of vanadium, molybdenum forms benzene. The process is called ___________.
III. Answer any five of the following. Each question carries two marks: 21. Define entropy? What happens to the entropy when liquid changes into vapour? 22. What is the heterogeneous equilibrium? Give an example. 23. What are isoelectronic species? Select isoelectronic pair among the following: Na+, Cl-, F-, Li+ 24. Give any two limitations of octet rule. 25. Define hydrogen bond? Name a compound having intra molecular H-bond. 26. Helium is monoatomic. Explain on the basis of Molecular Orbital Theory. 27. Using the stock notation, represent the following compound (i) HauCl4, (ii) Fe2O3. 28. For the compound CH ≡ C – CH = CH – CH3 i) Write the bond-line formula for the above compound. ii) Mention whether the compound is saturated or unsaturated? 29. Write geometrical isomers of but-2-ene.
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