Download GTU BE/B.Tech 2019 Winter 4th Sem New 2141302 Environmental Sciences Ii Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- IV (New) EXAMINATION - WINTER 2019

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Instructions:

1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

1. 1. Define: Sol, emulsion, tyndall effect (2)

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   2. Enlist the mechanisms by which colloids can be coagulated. (2)
   3. Explain Aliphatic and Aromatic compounds with examples. (3)
2. 1. State Schulze-Hardy rule. (2)
   2. The solubility of BaCO3 is 5.9 x 10-5 M at 25°C. Calculate the solubility product i.e. Ksp. (2)

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   3. Explain Ionization of weak acids with examples. (3)

   OR

   1. Write a short note on binary mixtures. (2)
   2. Explicate the basic differences between BOD and COD (2)
   3. Define Colloids. Explain surface charge of colloids. (3)

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3. 1. Write a short note: Classes of amino acids (7)

   OR

   1. Explain in brief TOC. (3)
   2. Explain solubility product with appropriate examples. (4)

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4. 1. Explain the biochemistry of (i) Carbohydrates (ii) Proteins (7)
5. 1. What are the factors affecting solubility of oxygen in water. (2)
   2. What is common ion effect? Give its application in waste water treatment with examples (2)

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   3. Explain modified Winkler Method with Chemical Reaction for DO determination. (3)

   OR

   1. How dilution water is prepared in laboratory for BOD? (2)
   2. Why organic matter removal is important for wastewater treatment? (2)
   3. How will you determine Oil and Grease in laboratory? (3)

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6. 1. Differentiate: physical adsorption and chemisorption (2)
   2. Write brief note biological properties of pesticides. (2)
   3. Describe in brief the methods used for the determination of volatile acids. Explain applications of volatile acids data. (3)

   OR

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   1. Explain working principle of COD determination with examples. (3)
   2. Define with suitable examples: Primary alcohol (i) Secondary alcohol (ii) tertiary alcohol (4)
7. 1. Explain the chemistry involved in Argentometric method for determination of chloride with pH consideration. (7)

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