MDCAT Chemistry Chapter 21 Environmental Chemistry Online Test With Answers

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MDCAT Chemistry Chapter 21 Environmental Chemistry Online Test

Sr. # Questions Answers Choice
1 The incineration may reduce volume of wastes upto: 1/4th 1/2nd 2/3rd 3/4th
2 For incineration temperature range is (in oC) 700-800 800-900 900-1000 1000-1100
3 Leachate contains: fatty acids Bacteria Heavy metals All of these
4 Site of land for landfill is selected based upon. topography location of ground water table All of these
5 The semi solid wastes in landfills is called: Landfill effluents Leachate Incineration
6 a hole used to dump the municipal wastes is called: landfill effluents leachate inclneration
7 Water cover earth surface more than: 50% 60% 70% 80%
8 HOCl is a compound: Polor inorganic organic Ionic covalant
9 Coagulation removes suspended particles in ran water: 60% 70% 80% 90%
10 Insoluble ferric oxide is produced in the pH range: 1 to 8 6 to 9 3 to 13 8 to 13
11 Commonly used coagulants are ions of: Ferrous Al Cr Ferric
12 alum or aluminium sulphate used as coagulant in alkaline medium change into precipitate of radicals of alumimium. sulphates oxides hydroxides chlorides
13 Pathogens in raw water are killed in step: aeration coagulation chlorination treatment
14 Water is made disinfectant during purification of water to the step: aeration coagulation chlorination treatment
15 Chemical like Al2(SO4) or alum are used in purification of water druing step: aeration coagulation chlorination treatment
16 Materials suspended in water or present as colloidal form in raw water are removed by: aeration coagulation chlorination treatment
17 Suspended matter is settled in purification of water by: aeration coagulation chlorination treatment
18 Water is purified by: Filtration aeration coagualation All of these
19 Leather tanneries use big auantities of: Cr Vi salts Cr III salts Mn-salts Pb-salts
20 Which is the most toxic among the given? heavy metals non-metals Metals Metalloids
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