BSc Chemistry SEM I ATKT 2017-18 ATKT Chemistry Paper I Question Paper - Mumbai University | munotes

Questions asked in this paper

• Please check whether you have got the right question paper

1. Q2 Answer to the same questions must be written together
2. Q3 Figures to the right indicate full marks
3. Q4 Use of non-programmable calculator is allowed
4. Q1 A) Select the correct option and complete the following sentences. 12 marks
   • i) endothermic reaction, enthalpy change is 2
   • ii) methanol solution refers to
   • a) 50cm? of methanol in 100 cm? of solution
   • b) 50g of methanol in 100 cm? of solution
   • c) methanol in 100
   • iii) If workis done by the system, W is taken as
   • iv) Density is
   • v) quantum number of 4f electron is
   • vi) number of an electron is denoted by
   • vii) | The number of radial nodes for 2s orbitals is
   • viii) | According to quantum theory E=
   • a) he c)hv
   • ix) in nature
   • x) is an electron deficient species having positive charge on trivalent carbon
   • xi) Alkenes are unsaturated compounds with general molecular formula
   • xii) Which of the following is the functional group of aldehyde
   • a) -COOH c) - CHO
   • B) State whether the following statements are True or False. 3
   • i) .The normality of Cr,0, is 1
   • ii) Helium is a polyelectron atom
   • iii) imine, both carbon and nitrogen atoms are SP? hybridised
   • Q.P. Code :12157
   • C) Match the following columns:- 5
   • i) Normality a) AV=0
   • v) cyanide
5. Q2 A) i) terms 5 marks
   • a) Standard state
   • ii) Define heat capacity at constant volume. Calculate the value of AE on heating 5 moles of oxygen from to 3
   • A) i) enthalpy of combustion? Calculate enthalpy of combustion of (g) from the following data The balanced equation for one mole of 5
   • (g) + 2. > H20 + SO2 (g)
   • ii) State and explain zeroth law of thermodynamics. Explain why is it called so? 3
   • B) i) Calculate the amount of heat necessary to raise the temperature of 198 g of water from to Molar heat capacity of water is 75.3 J.K7+ At. wt. of H= 5
   • ii) Calculate the weight of the following substances that will be required to prepare 3
   • a) 0.25 dm? of 0.2 M NaCl solution
   • b) 250 cm? of 0.01 M EDTA disodium salt solution
   • c) 100 cm? of 0.1 M solution
   • B) . Define work. Calculate g, w and AE when three moles of monoatomic gas expand adiabatically against constant external pressure of 4 atm. from a volume of 3 dm? to 20dm? at 300K 5
   • ii) g of NaOH is dissolved in 0.5 dm? of solution. Calculate normality of solution. 3
   • Q.P. Code :12157
6. Q2 C) i) Define: 2 marks
   • a) Isolated system b) state function
   • ii) Define the terms 2
   • a) ppm b) Millimoles
   • ii) | Explain the term molality of the solution. 2
   • A) i) and explain postulates of Bohr’s model of atom. 5
   • ii) | meant by dual nature of an electron? Explain on the basis of de Broglie equation. 3
   • A) Whatare the properties of a wave function in order to be an acceptable wave function? 5
   • ii) | Explain the terms shell and subshell with appropriate example. 3
   • i) Explain the term ionisation enthalpy. How does it vary i). along.a period ii) down the group and why? 5
   • ii) | Whatis meant by atomic radius? Calculate atomic radius of fluorine, bondlengthis 14.9 x 1072 nm and covalent radius of carbon is 7.7 x 3
   • B) i) Explain the term electron gain enthalpy. Why are electron gain enthalpy values 5
   • ii) Calculate effective nuclear charge felt by 4s electron of potassium (Atomic number of 3
   • C) What are limitations of Rutherford’s atomic model? 4
   • C) With suitable diagram explain radial probability distribution curve for 1s orbital. Calculate number of radial nodes for 1s orbital 4
7. Q4 A) IUPAC names of following compounds. 5 marks
   • ii) Draw molecular orbital structures of following:- 3
   • a) Methanol b) Ether
   • Q.P. Code :12157
   • A) i) Give the structures for following:- 5
   • a) Ethyl ether
   • b) Pentane 1,3 diene
   • c) 2-Bromo butane
   • d) Methyl methanoate
   • e) 2-Butanone
   • ii) Indicate types of hybridization of Nitrogen atoms in following Compounds. 3
   • B) i) Covalent bond? Explain sigma and pi bonds. How are they formed? 4
   • ii) | Explain structure and bonding in Hydrogen Cyanide. 4
   • B) Carbocation? Explain its shape with internal bond angle. 4
   • ii) Distinguish between: 4
   • C) Give IUPAC names of following compounds:- 4
   • i) ii)
   • iii) iv)
   • C) Draw the structures for following compounds. 4
8. Q5 Attempt any four of the following:
   • A) Derive the relationship 5
   • B) 300 cm? of Ethanol is mixed with 350 cm? water. Calculate the mole fraction of each component in the mixture. Assume no change of volume takes place density of water = 1.0 g cm? density of ethanol = 0.78 g 5
   • C) Name and explain spectral series observed in atomic spectrum of hydrogen. 5
   • D) Write the mathematical expression of Heisenberg uncertainty principle? Explain the terms 5
   • E) Draw resonance structures of the following:- Explain bonding and structure of Ethane with orbital diagram. (05) 5

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