BSc Chemistry SEM II 2018 19 May 2018-19 CHEMISTRY PAPER II Question Paper - Mumbai University | munotes

Questions asked in this paper

• Please check whether you have got the right question paper

1. Q2 Answers to the same questions must be written together
2. Q3 Figures to the right indicate full marks
3. Q4 The use of log table/ non programmable calculator is allowed
4. Q1 (A) Select the correct option and complete the following statements(Any twelve) 12 marks
5. Q1 The H* ion concentration in water at il) The pH of 0.05M ili) The pH of Sea wateris Iv) Amorphous solids have solid state properties, but they do not
   • v) _ is the axial distances and axial angles for
   • a) without medium
   • b) with medium
   • c) with medium and without medium Vil) If steric number of the central atom is five then the arrangement of electron pairs around the central
   • c) trigonal bipyramidal The electrostatic forces of attraction between oppositively 1x) Covalent bond is formed when two electrons in a molecule is
   • a) shared equally by both the atoms
   • b) not shared equally by both the atoms
   • c) are transformed from one atom to another atom
6. Q10 The bond angle in Iodine is insoluble in water, the solutions of iodine is prepared Strong oxidizing agent in the electrochemical series is
   • a) Li b) F, c)
   • xiii) Thiophene
   • xiv) of benzene nitric acid is used along XV) _ is a meta directing group
   • a) —OH b) c) -NO,
   • xvi) of cyclohexane Xvii) Aromatic compound is than anti aromatic compound
   • (B) State whether the following statements are True or False 3
   • i) Tonic equilibria is established in aqueous solutions of all il) All electromagnetic waves travel through a vacuum at the 111) Polarizability of LiCl is more than NaCl Iv) The number of lone pairs in HF molecule is one Resonance energy of benzene is 36 kcal
   • vi) According to Huckels rule monocyclic ring which have eight
   • (C) Match the following columns(Any Five) 5
   • (i) | The pH of (a) | Edge
   • (ii) | Intersection of (b) | Oxidation Decrease of (c) | Staggered form
   • (vi) | Antiaromatic
7. Q2 Attempt any Four of the following
   • (A) Explain the use of Hendersons equation for the measurement of pH of an acidic buffer solution 5
   • (B) Calculate the pH of 0.1M solution of ammonia. 5
   • (C) What is degree of ionization? Discuss the factors that affect the degree of ionization 5
   • (D) Determine the wavelength and energy of the microwave 5
   • a) by a microwave oven of frequency Hz and
   • b) by phone of frequency 5.8 Hz
   • (E) Explain the different types of interaction between radiation and
   • (F) Define Unit cell. State the three laws of crystallography. 5
8. Q3 Attempt any Four of the following
   • (A) What is isoelectronic principle ? Explain it with suitable 5
   • (B) Explain the effect of lone pair of electron in the geometry of molecule by giving suitable example 5
   • (C) What is steric number ? Calculate the steric number of the 5
   • (D) Draw the Lewis dot structure of the following: 5
   • a) BCl, and b)
   • (E) Balance the following reaction with stepwise explanation: (in Basic medium) 5
   • (F) Discuss redox stability is water with example. 5
9. Q4 Attempt any Four of the following
   • (A) Explain sulphonation of benzene with mechanism. 5
   • (B) What are the criteria which must be satisfied for the compound to be aromatic?
   • (C) Draw the conformations of cyclohexane. Give the relative stabilities of these conformations ? 5
   • (D) Which of the following are aromatic, antiaromatic or non 5
   • (E) Explain why cyclopropane is less stable than cyclopentane. 5
   • (F) Complete the following reaction? Give its name and 5
10. Q5 Attempt any Four of the following
    • (A) Calculate the pH of a solution which contains 0.2 mol sodium acetate and 0.1 mol acetic acid per [Given : K, for the acid 5
    • (B) Define axis of symmetry. Draw the different axis of symmetry of a cubic crystal 5
    • (C) i) Find out the oxidation number of Cr in and . 2
    • ii) What are disproportionation reactions? Explain the disproportionation reaction of Cu* to and Cu’ 3
    • (D) Explain the titration curve of reaction between and 5
    • (E) 1) What is flipping of cyclohexane? 3
    • ii) Explain steric strain. 2
    • (F) State Hammond’s Postulate. How does it help to identify the structure of transition states? 5

Read from the scan above, so a character or two may differ. The scan is the original.