B.Sc. Biotechnology (Part (Semester (CBCS)
Examination, 2018
FUNDAMENTALS OF CHEMISTRY AND BIOPHYSICS
Paper I Chemical Science
Day and Date Thursday, 5-4-2018 Max. Marks 70
Time 10.30 a.m. to 1.00 p.m.
Instructions All questions are compulsory.
Draw neat diagram and give equations wherever
necessary.
Figures to the right indicate full marks.
Use of log table or calculator is allowed.
1.Choose the most correct alternative from each of the following 14
is an example of covalent compound.
CH4 KNO3 KCl HCl
Methane involves hybridization of carbon.
sp sp2 sp3 sp3d
In case of ethane Carbon-Carbon bond length is A0.
1.54 1.34 1.44 1.25
molecule has non zero dipole moment.
m-Dichlorobenzene CBr4
CCl4 Benzene
molecule involves intra molecular hydrogen bonding.
HF Cl2
H2 o-Nitro phenol
is an example of non-polar solvent.
Methyl alcohol Benzene
Water o-Nitro phenol
For a second order reaction with equal concentration the half-life period, t1/2
is given by
1/k×a 1/k 1/a k×a
If 10 g of NaOH is dissolved in 100 ml water the solution will be
NaOH solution.
1N 2M 10% 4M
Velocity constant k of second order reaction is expressed in
mol.lit-1, S-1 dm3.mole-1S-1
lit-1.mole-1 S-1 All of these
10) When weight of compound equal to its equivalent weight is dissolved in 1000 ml
of solvent, the solution will be one solution.
Molar Normal Percent Molal
11) 3H2(g) N2 2 NH3(g) is an example of
Heterogeneous catalysis Homogeneous catalysis
Enzyme catalysis All of these
12) The phenomenon of suppression of the degree of dissociation of a weak acid
or a weak base by the addition of a strong electrolyte containing a same ion is
known as effect.
Osmosis Addition Solubility Common ion
13) bonds are present in simple proteins.
Phospodiester Coordinate Peptide Ionic
14) A process by which molecules of a solvent tend to pass through a
semipermeable membrane from a less concentrated solution into a more
concentrated one is called as
Osmosis Reverse osmosis
Dilution Transportation
2. Answer any seven of the following 14
Explain what are buffers.
What is one percentage solution
Give any two general characteristics of enzyme catalyzed reactions.
Define dipole moment, mention its significance.
What are colligative properties Give one example.
Write integrated rate expression second order reaction with equal and unequal
concentration.
Mention any two characteristics of first order reaction.
Define hypotonic and isotonic solution.
3. Answer any two of the following 10
What is common ion effect Explain in details with example.
Define and explain the following terms with example Molarity Normality.
Define catalysis, explain its types with example.
The half life of a second order reaction is 40 minutes, when the initial
concentrations of reactants are 0.05 M each what is the velocity constant of
the reaction. 4
4. Answer any two of the following 14
Explain the concept of SP hybridization with respect to ethyne molecule.
Derive an integrated rate expression for second order reaction with equal
concentration.
Define solvent, solute and solvation energy; explain different factors affecting
solubility.
5. Answer any two of the following 14
If molecular weight of solid NaOH is 40 units, how will you prepare 1N, 2M
and of 1000 ml NaOH solutions
Explain the terms rate constant, order and molecularity of reaction.
What are ionic and covalent solids Mention examples and give comparison
between them.