Download GTU BE/B.Tech 2019 Winter 3rd Sem New 3131305 Environmental Chemistry I Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 3rd Sem New 3131305 Environmental Chemistry I Previous Question Paper

1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ? III (New) EXAMINATION ? WINTER 2019
Subject Code: 3131305 Date: 28/11/2019

Subject Name: Environmental Chemistry-I
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Marks

Q.1 (a) List out any two instruments along used in the Environmental chemistry lab
and draw its figure.
03
(b) Write process for calibration of the pH meter. 04
(c) Explain Henry?s law and Dalton?s law with their significance in the field of
environmental engineering.
07

Q.2 (a) Categorize types of sampling techniques. 03
(b) Determine process for the preparation of demineralized water. 04
(c) Explain the principle of the Atomic Emission Spectroscopy. 07
OR
(c) Enlist Electrode used in the Environmental Chemistry and Explain any two
Electrodes in detail.
07
Q.3 (a) Classify type of errors may be present while performing the experiments. 03
(b) Calculate the molarity of solution after 350 ml of water is added to 650 ml
of 0.75 N NH4OH solution.
04
(c) Prepare methods for making standard solution of 1M H2SO4. 07
OR
Q.3 (a) Compare 2N sodium chloride solution in water and 2M sodium chloride
solution, which is more salty? Why?
03
(b) Calculate weight required for preparation of the following solutions: (a)
0.45M NaCl in 450 ml, (b) 0.55N CaSO4 in 550 ml
04
(c) Prepare methods for making standard solution of 1N NaOH. 07
Q.4 (a) What is Dispersion and scattering? 03
(b) Explain Desiccation and Drying. 04
(c) Calculate hydrogen ion activity and hydroxide ion activity of following
solution: (a) 4 pH (b) 6 pH (c) 8 pH
07
OR
Q.4 (a) Define Chemical Precipitation and Filtration. 03
(b) Explain standard methods for the water and wastewater. 04
(c) Calculate pH of following solution (a) 0.2 g of hydrogen ion per liter, (b)
3.4x10
-8
g of hydroxide ion per liter and (c) 0.05 N NaoH.
07
Q.5 (a) Give the relation equation for calculate (a) TDS, (b) TSS, (c) TS with
Gravimetric Analysis.
03
(b) Write application of alkalinity data. 04
(c) Explain experimental methods for determination of Hardness present in
wastewater sample.
07
OR

Q.5 (a) Give the relation equation for calculate (a) hydroxide alkalinity, (b)
carbonate alkalinity, (c) bicarbonate alkalinity with phenolphthalein
alkalinity and methyl orange alkalinity.
03
(b) What is the role of sulfate in the Environment engineering? 04
(c) Explain experimental methods for determination of Total Dissolved Solids
(TDS) present in water sample.
07

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