chemistry 1st semester important question for bsc pass, Assam University previous year question paper,
UNIT I
1) write down the expression for wavelength of 3rd line of bracket series using Rydberg equation. [2015 AU]
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2) State Heisenberg's Uncertainty principal, also write its mathematical form. [2015 AU]
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statement: it is impossible to measure simultaneously the exact position and exact velocity(or momentum) of a sub-atomic particle like electron and neutron.
Mathematical form: ∆x.∆p ≥ h/2π
Mathematical form: ∆x.∆p ≥ h/2π
3) derive the Bohr's equation for the energy of an electron of the hydrogen atom. [2015 AU]
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UNIT II
4) explain the emphoteric behaviuor of H2SO4. [2015 AU]
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5) between Na +ve and Ag +ve which is a stronger Lewis acid and why? [2015 AU]
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UNIT III
6) how XeOF4 is prepared. draw its structure. [2015 AU]
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7) what happen when XeFO4 is hydrolised. [2015 AU]
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8) What happen when aquous solution of ClO2 undergoes photochemical decomposition. [2015 AU]
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9) Discuss the structure of XeF4 in the light of hybridisation. [2015 AU]
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UNIT IV
10) what happen when B2H6 undergoes combustion. [2015 AU]
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11) what happen when diaborane react with excess of ammonia at high temperature. [2015 AU]
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12) explain why transition element acts as a catalyst. [2015 AU]
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13) write the electronic configuration of the anti-penultimate member of first transition series. [2015 AU]
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UNIT V
14) What is resonance energy. [2015 AU]
15) what are the necassary condition for a compound to be aromatic. [2015 AU]
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16) Discuss the effect of hybridisation on bond length and bond strength. [2015 AU]
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UNIT VI
17) define the term "enantiomer" with suitable example. [2015 AU]
18) Explain E/Z nomenclature with suitable example. [2015 AU]
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UNIT VII
19) Explain Kharasch effect with suitable example. [2015 AU]
20) what happen when ethene react with peracetic acid? give the mechanism. [2015 AU]
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UNIT VIII
21) Discuss the Factor affecting the reactivity of alkyl halid by Sn2 process. [2015 AU]
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22) explain the energy profile diagram for Sn1 process. [2015 AU]
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UNIT IX
23) Write the significance of Van dar Waal constant a and also write its SI unit. [2015 AU]
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24) Write the Van Dar Waal's reduced equation of state. [2015 AU]
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25) Write the two faulty postulates of Kinetic theory of gas. [2015 AU]
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UNIT X
26) Define Collision frequency. [2015 AU]
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27) Define the term "molar heat capacity". [2015 AU]
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28) Define equipartition of energy. [2015 AU]
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29) Show that a)mean free path is directly proportional to T and inversly proportional to P. b)Collision frequency is directly proportional to square of its pressure at constant pressure [2015 AU]
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UNIT XI
30) mention the interaction between NO3 -ve and I2 molecule. [2015 AU]
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31) show that 1 poise= 1g/(cm s). [2015 AU]
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UNIT XII
32) State Hanks low of rational indices. [2015 AU]
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33) Draw and define the unit cell which is present in four different forms. [2015 AU]
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34) Write the miller indices for the plane which cuts the axces at 2a, -3b, -4c. [2015 AU]
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32) How many unit cell are present in a cube shape crystal of NaCl of mass 1g. [2015 AU]
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