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

Enrollment No:

Subject Code: 3131305

BE - SEMESTER- III (New) EXAMINATION — WINTER 2019

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Subject Name: Environmental Chemistry-I

Time: 02:30 PM TO 05:00 PM

Instructions:

1. Attempt all questions.
2. Make suitable assumptions wherever necessary.

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3. Figures to the right indicate full marks.

Q.1

1. List out any two instruments used in the Environmental chemistry lab and draw its figure. (Marks: 03)
2. Write process for calibration of the pH meter. (Marks: 04)
3. Explain Henry’s law and Dalton’s law with their significance in the field of Environmental chemistry. (Marks: 07)

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Q.2

1. Categorize types of sampling techniques. (Marks: 03)
2. Determine process for the preparation of demineralized water. (Marks: 04)
3. Explain the principle of the Atomic Emission Spectroscopy. (Marks: 07)

OR

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1. Enlist Electrode used in the Environmental Chemistry and Explain any two Electrodes in detail. (Marks: 07)

Q.3

1. Classify type of errors may be present while performing the experiments. (Marks: 03)
2. Calculate the molarity of solution after 350 ml of water is added to 650 ml of 0.75 N NH4OH solution. (Marks: 04)
3. Prepare methods for making standard solution of 1M H₂SO₄. (Marks: 07)

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OR

1. Compare 2N sodium chloride solution in water and 2M sodium chloride solution, which is more salty? Why? (Marks: 03)
2. Calculate weight required for preparation of the following solutions: (a) 0.45M NaCl in 450 ml, (b) 0.55N CaSO₄ in 550 ml (Marks: 04)
3. Prepare methods for making standard solution of 1N NaOH. (Marks: 07)

Q.4

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1. What is Dispersion and scattering? (Marks: 03)
2. Explain Desiccation and Drying. (Marks: 04)
3. Calculate hydrogen ion activity and hydroxide ion activity of following solution: (a) 4 pH (b) 6 pH (c) 8 pH (Marks: 07)

OR

1. Define Chemical Precipitation and Filtration. (Marks: 03)

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2. Explain standard methods for the water and wastewater. (Marks: 04)
3. Calculate pH of following solution (a) 0.2 g of hydrogen ion per liter, (b) 3.4x10^-6 g of hydroxide ion per liter and (c) 0.05 N NaOH. (Marks: 07)

Q.5

1. Give the relation equation for calculate (a) TDS, (b) TSS, (c) TS with Gravimetric Analysis. (Marks: 03)
2. Write application of alkalinity data. (Marks: 04)

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3. Explain experimental methods for determination of Hardness present in wastewater sample. (Marks: 07)

OR

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

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Date: 28/11/2019

Total Marks: 70

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