B.Sc. I (Semester (CBCS) Examination, 2018
Biotechnology
Fundamentals of Chemistry and Biophysics
Paper I Chemical Sciences
Day and Date Saturday, 3-11-2018 Max. Marks 70
Time 10.30 a.m. to 1.00 p.m.
N.B. All questions are compulsory.
Use of log tables/calculators is allowed.
Figures to the right indicate full marks.
1. Select the most correct alternative from the following and rewrite the sentences. 14
is unit of rate constant for first order reaction.
min2 S-1 S min
NaCl contains bond.
covalent metallic ionic hydrogen
In sp2 hybridization, bond angle is
120° 60° 109° 180°
is universal solvent.
Alcohol Acetone Water Ester
Positive Catalyst is the rate of reaction.
decreases increases minimizes reduced
orbital has square shape.
s p d f
is the ratio of Molecular Wt. and Acidity/Basicity/O.S.
Atomic weight Molecular weight
Atomic mass no. Equivalent weight
is polar molecule.
Cl2 Br HCI H2
A B P is
unimolecular bimolecular
tetramolecular none of these
10) Range of pH is
0 14 1 14 14 above 14
11) Molecularity of reaction never be
zero 3/2 2 3
12) is example of colligative property.
mass volume
osmotic pressure pressure
13) Molality is concept.
W/V W/W V/V V/W
14) pH value depends on ion.
OH- CI- Br-
2. Answer any four of the following. 8
Give any two general characteristics of ionic solids.
What is catalyst Give one example.
Define pH and pOH.
Define bond length and bond angle.
Prepared 0.25N (100 ml) KCI solution.
Write notes on any two of the following. 6
Dipole moment.
Catalysis.
Common ion effect.
3. Answer any two of the following. 8
Explain VBT postulates.
Define-Normality, Molarity, Molality and ppm.
Explain factors affecting on solubility.
Answer any one of the following. 6
What is osmotic pressure Explain concept of osmosis and reverse osmosis.
Explain concept of hybridization with respect to C2H4 molecule.
4. Answer any two of the following. 10
Give comparison between ionic and covalent compounds.
Derive an integrated rate expression for first order reaction.
Explain Molality and Normality with 2 examples of each.
Answer any one of the following. 4
What is solvation energy Explain types of solutions.
Explain characteristics of catalysis.
5. Answer any two of the following. 14
What is buffer Derive Henderson equation for acidic buffers.
What is solution Explain types of solvents.
What is sp3 hybridization Explain hybridization of CH4 molecule.