Guess Paper Chemistry 1st Year 2017 Exams Paper Chemistry Part- I (2017)
Question No.1: Select the suitable answer
(i) The height of peak in mass spectrum shows
(a) Number of isotopes (b) Mass number(c) Relative abundance (d) Average mass of element
(ii) The empirical formula of chloroform is
(a) CH₂Cl₂ (b) CH₃Cl (c) CCl₄ (d) CHCl₃
(iii) The most common solvent used in solvent extraction
(a) Acetone (b) Ethanol (c) Rectified spirit (d) Ether
(iv) Partial pressure of oxygen in the lungs
(a) 1 atm (b) 159 Torr (c) 116 Torr (d) 200 atm
(v) The molecules of CO₂ in dry ice form the
(a) Ionic crystals (b) Covalent crystal (c) Molecular crystal (d) Any type of crystals
(vi) Water may boil at 120C°, when the external pressure is
(a) 100mmHg (b) 760 mmHg (c) 700 mmHg (d) 1489 mmHg
(vii) The value of Plank’ constant ‘h’ is
(a) 6.625×10ˉ²⁴ Cal (b) 6.625×10ˉ³⁴J.S (c) 6.62×10ˉ³⁴Kj (d) All
(viii) An orbital which is spherically symmetrical is called
(a) S-orbital (b) P-orbital (c) d-orbital (d) f-orbital
(ix) Octet rule is not followed in the formation of
(a) NF₃ (b) CF₄ (c) CCl₄ (d) PCl₅
(x) Which one of the following theories gives the idea of Hybridization
(a) VSER (b) Lewis (c) MOT (d) VBT
(xi) At constant volume, qv is equal to
(a) ∆E (b) ∆H (c) ∆V (d) ∆P
(xii)In case of gases, Kc is replace by
(a) Ka (b) Kb (c) Kp (d) Kw
(xiii) The cathode in NICAD is
(a) Ag₂O (b) Zn (c) NiO₂ (d) Cd
(xiv)The reaction of chloroform with chlorine has an order
(a) 1 (b) 2 (c) 1.5 (d) 2.5
(xv) The %age of oxygen in H2O is
(a) 80% (b) 9.8% (c) 8.8% (d) 88.89%
(xvi) A conjugate solution of water and phenol becomes homogeneous at
(a) 34oC (b) 44oC (c) 96.5oC (d) 69.5oC
(xvii) Which of following the pairs has trigonal planar geometry?
(a) NH3 , PH3 (b) H2O, C2H2 (c) CO2 , SO2 (d) BF3, SO3
Paper Chemistry Part- I (2017)
Question No. 2: Attempt any eight short questions: (8×2)
(i) How can the efficiency of a chemical reaction be expressed?
(ii) Concept of limiting reactant is not applicable to reversible reaction. Explain it?
(iii) Explain the relative abundance of isotopes with suitable example?
(iv) How many steps are involved in a complete quantitative analysis?
(v) Name the steps which are used in crystallization
(vi) What are uses of chromatography?
(vii) Calculate the value of R in S.I units.
(viii) Differentiate between diffusion and effusion?
(ix) Write down the two faulty postulate of kinetic molecular theory?
(x) State the law of mass action?
(xi) How does a catalyst effect a reversible reaction?
(xii) What is justification for increases of ionic product of water?
Question No. 3: Attempt any eight short questions: (8×2)
(i) What is atomic absorption spectrum? How is it obtained?
(ii) What are the defects in Rutherford atomic model?
(iii) Distribute the electron in Cu₂₉ and Br₃₅.
(iv) How are cathode rays produced?
(v) Water is a liquid at room temperature but H₂S is a gas. Give reason.
(vi) Why boiling point of water is different at Murree hills and at Mount Everest?
(vii) Define isomorphism and polymorphism with one example each.
(viii) Why molecular solids are soft and easily compressible?
(ix) Differentiate between continuous and discontinuous solubility curve?
(x) How can we say that a voltaic cell is a reversible cell?
(xi) What are the electrode reactions in lead storage battery?
(xii) What is zeotropic and azeotropic mixture?
Question No. 4: Attempt any Six short questions: (6×2)
(i) How rate of reaction is affected be surface area of reactants
(ii) Define activation energy and activated complex?
(iii) What is homogeneous and heterogeneous catalysis?
(iv) Why the size of anion is larger and size of cation is smaller than its parent atom?
(v) Why ionization energy decreases down the group in periodic table?
(vi) Explain the SP² hybridization in ethane?
(vii) How do you justify that MOT is superior to VBT?
(viii) Define standard heat of atomization?
(ix) Define system surroundings and state function?
Note: Attempt any threequestions.
Q. No. 5: (a) What are ionic solids? Explain the structure of NaCl?
(b) NH3 gas can be prepared by heating together two solids NH4Cl and Ca(OH)2. If mixture containing 100 g of each of solid is heated, then calculate the number of grams of NH3 produced? (4)
Q.No.6: (a) What is joule Thomson effect? Explain the liquefaction of gases by Lind’s method (4)
(b) Explain the hydrogen spectrum on the basis of Bohr’s theory (4)
Q.No. 7: (a) Write the postulates of M.O.T and explain why O₂ molecule shows paramagnetic behaviour? (4)
(b) What is 1st law of Thermodynamics?
Q.No. 8: (a) The solubility of PbF2 at 250C is 0.64 g/dm3. Calculate Ksp of PbF2? (4)
(b) Explain the discharging and recharging of lead accumulator (4)
Q.No. 9: (a) Explain the concept of Hydration and Hydrolysis? (4)
(b) How does Arrhenius equation. Paper Chemistry Part- I (2017)