CSS 2017 Chemistry Combined Papers Past Paper

Paper details

Examination

CSS

Year

2017

Subject

Chemistry

Paper

Combined Papers

Subject type

Optional

Mode

Subjective

Questions recorded from this paper

These 12 question wordings are transcribed from CSS Vista’s structured Chemistry past-paper record for CSS 2017.

1. Q2 · Schrödinger wave equation and its solution for particle in one and three dimensional box(a) Derive Schrodinger wave equation for motion of a particle in one dimensional (10) box. (b) Solve Schrodinger wave equation to find the expression for wave function (6) energy of a particle in one dimensional box. (c) What is Eigen function and Eigen value? Give examples. (4)
2. Q4 · conductometric titrations(a) State and explain Kohlrausch’s law. Give its applications. (10) (b) What is meant by standard deviation? Give its significance in analytical (6) chemistry. (c) Briefly describe conductometric titrations. (4)
3. Q3 · ideal and real gases(a) Define heat capacities and molar heat capacities. Prove that C p-Cv=R for ideal (10) gases. (b) What is Gibbs energy? Derive a relation between standard Gibbs energy change (6) and equilibrium constant. (c) Differentiate spontaneous and non spontaneous process. (4)
4. Q5 · Arrhenius equation and rate equations of complex reactions(a) Discuss the effect of temperature on rate of chemical reaction on the basis of (10) Arrhenius equation. How can you determine activation energy and pre-exponential factor for a chemical reaction using Arrhenius equation? (b) Derive kinetic equation for 1st order reaction. (6) (c) Prove that half life period for 1st order reaction is independent of initial (4) concentration of reactant.
5. Q6 · Catalysis(a) What is adsorption isotherm? Derive Langmuir adsorption isotherm for (10) adsorption of a gas on solid surface. (b) What is enzyme catalysis? Discuss its kinetics. (6) (c) What are surfactants? Give their properties. (4)
6. Q7 · nitrogen(a) What is electrophoresis? Give its principle and discuss its applications in (10) biochemistry. (b) Give six chemical properties of nitrogen. (6) (c) What is Common ions effect? Give its applications. (4)
7. Q8 · Werner's theory(a) State John-Teller theorem. Explain it using suitable examples from coordination (10) complexes. (b) Give postulates of Werner’s theory of coordination complexes. (6) (c) Briefly describe nuclear decay rate law for disintegration of radioactive elements. (4) Roll Number
8. Q2 · Inductive effectWrite brief notes on the following (2 each) (20) (i) Covalent Bond (ii) Hybridization (iii) Isomerism (iv) Monosaccharides (v) Triglycerides (vi) Electronegativity (vii) The Inductive Effect (viii) Chemical Shift (ix) Stereoselectivity (x) Fertilizers
9. Q5 · Nomenclature(a) What is Grignard reagent? What are its applications? How would you prepare (8) Grignard reagent starting from an alkyl halide of your choice. (b) Give the Product of the following reactions: (3) H2SO4 Heat ? H2CrO4 ? SOCl2 ? (c) Give the IUPAC nomenclature of Aldehydes and Ketones. (4) (d) Give the major products of the following reactions. (5) 2EtOH + acid ? O Ph3P CH2 ? ? CH3MgBr ? PhNH2 ?
10. Q3 · Chemistry of Aromatic Compounds(a) Give the method of synthesis of the following compounds from an (12) appropriate alkene of your choice with reagents. OH Br (i) Br (ii) (iii) H CH3 CH3 Cl CH3 C C Br CH3 C CH3 Cl (iv) OH (v) OH (vi) H (b) Write the Major product for these Reactions. (8) Hg(OAc)2 +H2O, NaBH4 ? BH3, H2O2, NaOH ? H2, Raney Nickel 1. ? H2 , Pd at 3 atm ? H2, Lindlar catalyst ? 2Na, NH3(liq) ? 2. NaNH2 H2O ? ? H2SO4, HgSO4 3. Br
11. Q4 · Aromaticity(a) What is aromaticity? Explain the Hückel criteria for aromaticity. (6) (b) Write names of the following compounds. (4) COEt CHO OCCH3 Ph OMe NH2 OMe NO2 (c) Write the reaction and mechanism of Friedel Craft alkylation and acylation (10) reaction.
12. Q6 · S configuration and(a) What is stereoisomerism? Give an account of different types of stereoisomerism. (5) (b) Assign an R or S configuration to the chiral center in each molecule. (9) H Cl Cl HO (c) In the following molecules identify that which are diastereomers and which are (6) enantiomers? H C OH H C OH HO C H HO C H HO C H H C OH HO C H H C OH

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