InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A sample of air turns lime water milky and also turns acidified potassium dichromate green in aqueous solution has low `pH`. This is due to the presence of pollutantsA. `CO_(2)`B. `SO_(2)`C. Both (a) and (b)D. None of these |
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Answer» Correct Answer - B `SO_(2)` turns lime water milky. `SO_(2)` in aquenous solution gives `H_(2)SO_(3)` `H_(2)SO_(3) hArrH^(+)+HSO_(3)^(-)` `CO_(2)` also turns lime water milky. `CO_(2)` in aqueous solution gives `H_(2)SO_(3)` `H_(2)CO_(3)hArrH^(+)+HCO_(3)^(-)` `H_(2)SO_(3)` is stronger acid than `H_(2)CO_(3)`. Thus, ionization of `H_(2)SO_(3)` is larger than `H_(2)CO_(3)`. Thus, `pH` of `H_(2)SO_(3)` is lower than that of `H_(2)CO_(3)` `SO_(2)` also turns acidified `K_(2)Cr_(2)O_(7)` solution green . `3SO_(4)+Cr_(2)O_(7)^(2-)+2H^(+) rarr 3SO_(4)^(2-)+2underset(Green)(Cr^(3+))+H_(2)O`. Thus, air sample has `SO_(2)` as pollutants. |
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| 2. |
100 ml of a sample of water requires 1.96 mg of potassium dichromate in the presence of `50% H_(2)SO_(4)` for the oxidation of dissolved oxygen demand. |
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Answer» One gram equivalent of any oxidant can give, one equivalent weight of oxygen (8 g) `49 g K_(2) Cr_(2)O_(7) rarr 8g O_(2)` `1.96 K_(2) Cr_(2)O_(7) rarr ?` `=(8xx1.96)/(49)=0.32 mg` Chemical oxygen demand of the given 100 ml sample of water `=0.32/0.1=3.2` ppm |
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| 3. |
Assertion : Manures and biofertilizers shuld be used in place of chemical fertilizers. Reason : Chemical fertilizers cause pollution by releasing excess nutrients in water bodies.A. If both assertion and reason are true and reason is the correct explanation of assertion.B. If both assertion and reason are true but reason is not the c orrect explanation of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false. |
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Answer» Correct Answer - a Manures and biofertilizers do not produce chemical pollutants by releasing excess nutrients in water , causing eutrophication. |
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| 4. |
Chernobyl tragedy occurred inA. 9th May, 1945B. 26th April, 1986C. 6th Aug, 1947D. 26th May, 1966 |
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Answer» Correct Answer - B On 26 April , 1986 at the chernobyl power station released a huge amount of radiaactive cloud into the atmosphere in which tragedy many people were killed |
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| 5. |
Which of the following is`//`are the hazardous pollutant(s) present in automobile exhaust gases ?A. (ii) and (iii)B. (i) and (ii)C. (ii) and (iv)D. (i) and (iii) |
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Answer» Correct Answer - C `CO` and oxides of nitrogen and poisonous gases present in automoblile exhaust gases. |
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| 6. |
The automobile vehicle pollutant isA. `H_(2)O`B. `NO_(2)`C. ParticulateD. Hydrocarbons |
| Answer» Correct Answer - 2 | |
| 7. |
Which is not a pollutant from exhaust of motor vehicle?A. HydrocarbnsB. Fly ashC. `NO_(x)`D. CO |
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Answer» Correct Answer - B Fly ash is not a pollutant from exhuasts of motor vehicle |
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| 8. |
Assertion: The marble structure reacts with traces of `H_(2)SO_(4)` present in acid rain. Reason: Taj Mahal is being slowly damaged by acid rain.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true and the reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If assertion is false but reason is true. |
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Answer» Correct Answer - D Correct Reason: The marble structure reacts with traces of `H_(2)SO_(4)`, `NHO_(3)` and `HCl` present in acid rain. |
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| 9. |
In the last decades, most serious nuclear reactor accident created MIC gas tragedy inA. Russia (1990) and Bhopal (1996)B. Ucraine (1986) and Bhopal (1984)C. Bhopal (1994) and Russia (1990)D. Ucraine and USA (1984) |
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Answer» Correct Answer - B Bhopal gas tragedy occurred on 3rd Dec. 1984 due to leakage of methyl isocyanate creating air pollution and causing death of about 2500 persons. Chernobyl disastrous tragedy occurred on April 26, 1986 due to explosion at chernobyl nuclear power station resulting huge amount of radioactive clouds in the Ukraine atmosphere. |
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| 10. |
Identify the wrong statement in the followingA. Greenhouse effect is responsible for global warmingB. Ozone layer does not permit infrared radiation from the sun to reach on the earthC. Acid rain is mostly because of oxides of nitrogen and sulphurD. Chlorofluorocarbons are responsible for ozone layer depletion |
| Answer» Correct Answer - B | |
| 11. |
Identify the wrong statement in the following `:`A. Chlorofluorocarbons are responsible for ozone layer depletion.B. Gree house effect is responsible for global warming.C. Ozone layer permit UV radiation from the sum to reach the earthD. Acid rain is the mostly because of oxides of nitrogen and sulphur. |
| Answer» Correct Answer - 3 | |
| 12. |
The wrong statement in the following isA. Acid-rain takes place mostly because of presence of oxides of nitrogen and sulphur in the atmosphere.B. Chloro fluoro carbons are responsible for `O_(3)` depletion.C. Green house is responsible for global warming.D. `O_(3)` layer allows UV radiations to reach the earth. |
| Answer» Correct Answer - 4 | |
| 13. |
Which of the following statement(s) is/are wrong ?A. Ozone is not responsible for green house effectB. Ozone can oxides sulphur dioxide present in the atmosphere to sulphur trioxideC. Ozone hole is thining of ozone layer present in stratosphereD. Ozone is produced in upper stratosphere by the action of UV rays on oxygen |
| Answer» Correct Answer - 1 | |
| 14. |
What would have happened if the greenhouse gases were totally missing in the earth’s atmosphere? Discuss. |
| Answer» The solar energy which is radiated back from the earth surface is absorbed by different green house gases that we have listed. As a consequence of it, the atmosphere around the surface of the earth becomes warm. This helps in the growth of vegetation and also supports life. In the absence of this effect, there will be no life of both plant and animal on the surface of the earth. | |
| 15. |
Biochemical Oxygen Deman, (BOD) is a measure of organic material present in water. BOD value less than `5 "ppm"` indicates a water sample to beA. rich in dissolved oxygenB. poor in dissolved oxygenC. highly pollutedD. not suitable for aquatic life |
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Answer» Correct Answer - A The total amont of of oxygen consumed by microorganisms (bactoria) in decomposing organic mattr present in certain volume of a sample of water is called Biochemical Oxygen Demand `(BOD)` of the water. Water considered to be pure if it has BOD less than `5 "ppm"` whears highly polluted water has BOD more than `17"ppm"` Thus, water having BOD than `5 "ppm"` is rich in dissolved oxygen. |
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| 16. |
Which of the following statement(s) is/are wrong ?A. Ozone is not responsible for greenB. Ozone can oxidise sulphur dioxide present in the atmosphere to sulphur trioxideC. Ozone hole is thinnig ozone layer present in stratosphereD. Ozone is produced in upper stratosphere by the action of UV rays on oxygen |
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Answer» Correct Answer - A `O_(3)` is reponsible for greehouse effect. Its contribution is about `8%` |
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| 17. |
Which one of the following statements is not correct ?A. DDT and BHC are not good insecticides because they are highly soluable in water.B. DDT and BHC are not good insecticides because they are absobed by the soil and contaminate root crops .C. Aldrin is not a good insecticide because it is not biodegradable .D. All the above are incorrect . |
| Answer» Correct Answer - A | |
| 18. |
The pollutants which come directly in the air from sources are called primary pollutes. Primary polluants are sometimes converted into secondary pollutants. Which of the following belongs to secondary air pollutants ?A. `CO`B. HydrocarbonsC. Peroxyacetyl nitrateD. `NO` |
| Answer» Correct Answer - 3 | |
| 19. |
Which of the following statement is correct ?A. Ozone hole is a hole formed in stratosphere from which ozone oozes out.B. Ozone hole is a hole formed in the troposphere from which ozone oozes out.C. Ozone hole is thinning of ozone layer of stratosphere at some places.D. Ozone hole means vanishing of ozone layer around the earth completely. |
| Answer» Correct Answer - C | |
| 20. |
Which of the following statements is correctA. Ozone hole is a hole formed instratosphere from which ozone oozes outB. Ozone hole is a hole formed in troposphere from which ozone oozes outC. Ozone hole is thining of ozone layer of stratosphere at some placeD. Ozone hole means vanisphing of ozone layer around the earth completely |
| Answer» Correct Answer - 3 | |
| 21. |
Which of the following conditions shows the polluted enviorment ?A. pH of rain water is 5.6B. amount of carbondioxide in the atmosphere is `0.03%`C. biocheical oxygen demand 10 ppmD. eutrophication. |
| Answer» Correct Answer - 2, 4 | |
| 22. |
Which of the following practices will not come under green chemistrya)If possible, making use of soap made of vegetable oils instead of using synthetic detergentsb)Using `H_(2)O_(2)` for bleaching purpose instead of using chlorine based bleachinf agentsc)Using bicycle for travelling small distances instead of using petrol/diesel based vehiclesd)Using plastic cans for neatly storing substancesA. If possible, making use of soap made of vegetable oils instead of using synthetic detergents.B. Using `H_(2)O_(2)` for bleaching purpose instead of using chlorine based bleaching agentsC. Using bicycle for travelling small distances instead of using petrol/diesel based vehiclesD. Using plastic cans for neatly storing substances. |
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Answer» Correct Answer - D Plastics are non - biodegradable , hence are not environmental friendly . |
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| 23. |
Assertion : Normally rain water has a pH of 5.6 Reason : `H^(+)` ions are formed by the reaction of rain water with carbon dioxide present in the air.A. If both assertion and reason are true and reason is the correct explanation of assertion.B. If both assertion and reason are true but reason is not the c orrect explanation of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false. |
| Answer» Correct Answer - a | |
| 24. |
Which one of the following gases is responsible for global warming as well as ozone layer depletion?A. `CO_(2)`B. `O_(2)`C. `CFC(s)`D. `N_(2)` |
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Answer» Correct Answer - C `CFCs` is `IR` absorber and thus causes global warming. `CFCs` is the major source of `O_(3)` layer depletion. `C Cl_(2)F_(2) rarr Cl+C ClF_(2)` `Cl+O_(3) rarr ClO+O_(2)` `ClO+O_(3) rarr 2O_(2)+Cl`. |
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| 25. |
Global warming can be prevented byA. DeforestationB. Growing treesC. Agricultural activitiesD. Preventing use of herbicides |
| Answer» Correct Answer - 2 | |
| 26. |
The pH of normal rain water isA. 6.5B. 7.5C. 5.6D. 3.5 |
| Answer» Correct Answer - C | |
| 27. |
Pollutants are the substances which present in the environment in greater proportion than its natural abundance and resulting in harmful or deterimental effect on the quality of environment. Generally highly toxic substances are considered . Generally highly toxic even substances that are normally considered harmless can cause pollution if they are present in underirable concentration. Over exploitation of natural resourses uncontrolled mechanisation deforestation and extensive use of chemical fertilizers and pesticides have brought about many changes in different component of the environment . Which one of the air pollutant is most toxic?A. `NO_(2)`B. `SO_(2)`C. `CO_(2)`D. CO |
| Answer» Correct Answer - D | |
| 28. |
Which of the following practices will not come under green chemistryA. If possible, making use of soap made of vegetable oils instead of using synthetic detergentsB. Using `H_(2)O_(2)` for bleaching purpose instead of using chlorine based bleachinf agentsC. Using bicycle for travelling small distances instead of using petrol/diesel based vehiclesD. Using plastic cans for neatly storing substances |
| Answer» Correct Answer - 4 | |
| 29. |
Pollutants are the substances which present in the environment in greater proportion than its natural abundance and resulting in harmful or deterimental effect on the quality of environment. Generally highly toxic substances are considered . Generally highly toxic even substances that are normally considered harmless can cause pollution if they are present in underirable concentration. Over exploitation of natural resourses uncontrolled mechanisation deforestation and extensive use of chemical fertilizers and pesticides have brought about many changes in different component of the environment . Acid rain is due to the increase in the concentration of . . . . . . . in the atmospheresA. `O_(3)`B. `CH_(4)`C. `SO_(2)` and `NO_(2)`D. `O_(2)` and `CO` |
| Answer» Correct Answer - C | |
| 30. |
Which of the following practices will not come under green chemistry ?A. If possible, making use of soap made of vegetable oils instead of using synthetic detergents.B. Using `H_2O`, for bleaching purpose instead of using chlorine based bleaching agents.C. Using bicycle for travelling small distances instead of using petrol/diesel based vehiclesD. Using plastic cans for neatly storing substances. |
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Answer» Correct Answer - D Plastic cans are not materials of green chemistry |
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| 31. |
Which of the following practices will not come under green chemistrya)If possible, making use of soap made of vegetable oils instead of using synthetic detergentsb)Using `H_(2)O_(2)` for bleaching purpose instead of using chlorine based bleachinf agentsc)Using bicycle for travelling small distances instead of using petrol/diesel based vehiclesd)Using plastic cans for neatly storing substancesA. If possible, making use of soap made of vagetable oils instead of using synthetic detergents.B. Using `H_(2)O_(2)`for bleaching purpose instead of using chlorine based bleaching agents.C. Using bicycle for travelling small distances instead of using petrol/diesel based vehicles.D. Using plastic cans for neatly storing substances. |
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Answer» Correct Answer - D Use of plastic cans for storing substances does not come under green chemistry. |
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| 32. |
Pollutants are the substances which present in the environment in greater proportion than its natural abundance and resulting in harmful or deterimental effect on the quality of environment. Generally highly toxic substances are considered . Generally highly toxic even substances that are normally considered harmless can cause pollution if they are present in underirable concentration. Over exploitation of natural resourses uncontrolled mechanisation deforestation and extensive use of chemical fertilizers and pesticides have brought about many changes in different component of the environment . Eutrophication causes reduction inA. Dissovled nitrogenB. Dissolved oxygenC. Dissolved carbon dioxideD. All of these |
| Answer» Correct Answer - B | |
| 33. |
Which of the following practices will not come under green chemistry?A. If possible, making use of soap made of vegatable oils instead of using synthetic detergents.B. Using `H_(2)O_(2)` for bleaching purpose instead of using chlorine based bleaching agentsC. Using bicycle for travelling small distance instead of using petrol/diesel baseed vehicales.D. Using plastic can for neatly storing substances |
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Answer» Correct Answer - D Using plastic cans for neatly storing substance will not come under green chemistry Water in lakes and rivers have been polluted by the use of plastic materials. The plastic materials are non-biodegradable. |
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| 34. |
Green chemistry involvesA. production of chemicals of our daily use from green house gasesB. such chemical processes in which green plants are usedC. those reactions which are of biological originD. use of non- toxic reagents and solvents to produce environment friendly products . |
| Answer» Correct Answer - D | |
| 35. |
The gas mainly responsible for global warming is :A. `CO_(2)`B. `CH_(4)`C. `O_(3)`D. `CFCs` |
| Answer» Correct Answer - A | |
| 36. |
The pH of normal water is :A. `5.6`B. `6.0`C. `7.0`D. `7.6` |
| Answer» Correct Answer - A | |
| 37. |
Which of the following practices involve green chemistry ? (i) Substitute CFCs by environmental friendly HFCs and other compounds (ii) Replace halogenated solvent by liquid `CO_(2)` for drycleaning , (iii) Use of `H_(2)O_(2)` for bleaching instead of `Cl_(2)` (iv) Use of tamarind seeds to clean municipal and industrial waste water.A. (i) and (ii) onlyB. (ii) and (iv) onlyC. (iii) and (iv) onlyD. (i),(ii),(iii)and (iv) |
| Answer» Correct Answer - D | |
| 38. |
Which of the following pollutants is not harmful for lungs ?A. COB. `CO_(2)`C. `SO_(2)`D. `NO_(2)` |
| Answer» Correct Answer - B | |
| 39. |
Here paragraph is given Based upon this paragraph some mutiple choice question are given.Each question has 4 choices A,B,C and D.out of which one is correct the correct option. `Paragraph//Comprehension-I` Whick of the following is /are not the source of pollution of sea waterA. Discharge of urboan sewage,silt,plasitcsB. Flow of pesticides and dimp[ed toxic chemical from alandC. fFrom beach tourism discharging sanitary and kitchen waste into seaD. all the above three |
| Answer» Correct Answer - D | |
| 40. |
Here paragraph is given Based upon this paragraph some mutiple choice question are given.Each question has 4 choices A,B,C and D.out of which one is correct the correct option. `Paragraph//Comprehension-I` Oil spilt isA. processs of mixing soil or rock salt in to waerB. spreading of oil into sea waterC. thick layer on the surface of sea waterD. None of the above |
| Answer» Correct Answer - B | |
| 41. |
Here paragraph is given Based upon this paragraph some mutiple choice question are given.Each question has 4 choices A,B,C and D.out of which one is correct the correct option. `Paragraph//Comprehension-I` Major source of oil pollution of sea water isA. wreckage of oil tankers in open seaB. human excreta, soaps and detergentsC. Industrial effluentsD. None of the above |
| Answer» Correct Answer - A | |
| 42. |
Which of the following is mainly responsible for damaging the ozone layer ?A. `CO_(2)`B. `CH_(4)`C. `NO`D. `CFCs` |
| Answer» Correct Answer - D | |
| 43. |
Which of the following statements are True (T) or False (F)? Mark them and select the answer from the codes given below. (I) Ozone is not responsible for greenhouse effect. (II) Ozone can oxidize `SO_(2)` present in the atmosphere to `SO_(3)` (III) Ozone hole is thinning of ozone layer present in stratosphere. (IV) Ozone is produced in the upper stratosphere by the action of `UV` rays on oxygen.A. `I=F,II=T,III=T,IV=T`B. `I=T,II=F,III=T,IV=F`C. `I=F,II=F,III=T,IV=T`D. `I=T,II=T,III=F,IV=F` |
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Answer» Correct Answer - A (I) There are several gases that are even stronger `IR` absorbers than `CO_(2)`.These are `CH_(4),O_(3),N_(2)` and `CFC`. Thus, these gases are responsible for greenhouse effect. Thus, given statement is false. (II) `SO_(2)+O_(3) rarr SO_(3)+O_(2)` (true) (III) True (IV) `O_(2) overset(hv)underset(lambda lt 2420Å)(rarr)2[O]` `O_(2)+O rarr O_(3)` (true). |
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| 44. |
Match the column I with column II and mark the appropriate choice . A. `(A) to (iii) , (B ) to (iv),(C ) to (ii) , (D) to (i)`B. `(A) to (ii),(B) to (iii) , (C ) to (iii) , (D) to (iv)`C. `(A) to (i) , (B) to (ii) , ( C ) to (iii) , (D) to (iv)`D. `(A) to (iv), (B) to (i) , (C ) to (ii) , (D) to (iii)` |
| Answer» Correct Answer - D | |
| 45. |
Few pollutants and their effects are listed below . Mark the incorrect match .A. Phosphate fertilizers in water - eutrophicationB. Hydrogen released in air - Global warmingC. Sewage dispsed in water - Increase in BOD levelD. Carbon dioxide in air - Acid rain |
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Answer» Correct Answer - B `H_(2)` is not responsible for global warming. |
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| 46. |
Ozone hole is maximum overA. EuropeB. AfricaC. IndiaD. Antarctia |
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Answer» Correct Answer - D Ozone hole is maximum over Antarctica. |
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| 47. |
Ozone hole is maximum overA. EuropeB. AntarticaC. IndiaD. Africa |
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Answer» Correct Answer - B Ozone hole is maximum over Antarctica |
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| 48. |
Mark the correct statement .A. Photochemical smog occurs in day time while the classical smog occurs in early morning hours.B. Acid rain damages the buildings while it is not toxic to vegetation and aquatic life .C. Carbon monoxide is a greenhouse gas which results in global warming .D. Smoke consists of fine particcles produced during crushing and griding of solid materials |
| Answer» Correct Answer - A | |
| 49. |
"Ozone hole" refers to:A. Increased concentration of `O_(3)`B. Reduction in the thickness of ozone layer in the stratosphereC. Reduction in the thickness of ozone layer in the troposphereD. Hole in ozone layers. |
| Answer» Correct Answer - B | |
| 50. |
Months in which ozone hole appears over poles isA. June-JulyB. August-SeptemberC. October-NovemberD. December-January |
| Answer» Correct Answer - B | |