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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.
| 501. |
In haemoglobin, CO and not `O_2` links to Fe (if both CO and `O_2` are present ) because CO is a stronger ligand than `O_2`. The number of groups to which Fe is coordinated other than vacant site for CO in haemoglobin is |
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Answer» Correct Answer - 5 In haemoglobin, Fe is coordinated to five groups and sixth site is free to which CO links if present. |
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| 502. |
The acids present in acid rain are ______.a)Peroxyacetylnitrateb)`H_(2)CO_(3)`c)`HNO_(3)`d)`H_(2)DO_(4)`A. PeroxyacetylnitrateB. `H_(2)CO_(3)`C. `HNO_(3)`D. `H_(2)SO_(4)` |
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Answer» Correct Answer - B::C::D All these acids are present in acid rain. |
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| 503. |
Which of the following is a challenge for green chemists?A. Knowing when to reduce and eliminate hazardous wasteB. Developing chemicals that are recyclableC. Training of cleaning up chemical spillsD. Awareness of the benefits of the benefits of green chemistry |
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Answer» Correct Answer - A Main challenge before chemists involved in green chemistry is how and when to reduec and eliminate hazadous (as nuclear , chemical) waste. |
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| 504. |
Green chemisis reduce risk byA. inventing technologies that will clean up toxic sitesB. minimizing the use of all chemicalsC. reducing the hazard inherent in a chemical product or riskD. developing recycled products |
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Answer» Correct Answer - C Green chemists are planning to reduce risk by reducing the use of hazardous chemicals in different processes. |
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| 505. |
Incomplete combustion of petrol or diesel in automobile engine producesA. CO and `H_(2)O` vapoursB. `CO and NO_(2)`C. COD. `SO_(2)` |
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Answer» Correct Answer - C CO is produced as a result of incomplete combustion of fossil fuels . |
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| 506. |
CO is a pollutant produced due to incomplete combustion of butane . One mole of butane requires 6.5 moles of `O_2` for complete combustion. If 6 moles of oxygen are available , then number of moles of CO produced will be |
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Answer» Correct Answer - 1 `C_4H_10+6.5O_2 to 4CO_2+ 5H_2O` `C_4H_10+6O_2 to 3CO_2 + CO+ 5H_2O` |
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| 507. |
Which one is the major reason for pollution in big cities ?A. Fossil fuelB. Acid rainC. Heat dispersionD. None of the above |
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Answer» Correct Answer - A one of the majopr reason for pollution in big cities is burining of fossil fuel. |
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| 508. |
Which of the following gases is not green house gas ?A. COB. `O_(3)`C. `CH_(4)`D. `H_(2)O` vapours |
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Answer» Correct Answer - A CO is not a green house gas. |
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| 509. |
Match the activity given in Column I with the type of pollution created by it given in Column II. |
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Answer» Correct Answer - A. `rarr (5)` , B. `rarr(4)`, C. `rarr (1)` , (D) `rarr (2)` , (E ) `rarr (3)` A. Classical smog, acid rain, water pollution, induce breathing problems, damage to buildings, corrosion of metals. B. May cause nerve disease in human. C. Water pollution. D. Photochemical smog, damage to plant life. Corrosion to building material, induce breathing problems, water pollusion. E. Damaging ozone layer. |
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| 510. |
Effect of pollution is first marked onA. Micro-organismsB. Green vegetation of an areaC. Food cropD. None of these |
| Answer» Correct Answer - B | |
| 511. |
Match the pollution(s) in column I with the effect(s) in column II. |
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Answer» Correct Answer - A. `rarr (4)` , B. `rarr (5)` , C. `rarr (1)` , D. `rarr (3)` , (E) `rarr (2)` A. Low concentration of sulphur dioxide causes respiratory disease e.g., asthma, bronchitis etc. B. The irritant red haze in the traffic and congested place is due to oxides of nitrogen. C. The increased amount of `CO_(2)` in air is mainly responsible for globel warming. D. Excess nitrate in drinking water cause methemoglobinemia (blue baby syndrome). E. Lead can damage kidney,liver reprodutive system etc. |
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| 512. |
Write two causes of water pollution and soil pollution. |
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Answer» For the causes of water pollution , For the causes of soil pollution, |
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| 513. |
Match the terms given in Column I with the compound given in Column II. |
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Answer» Correct Answer - A. `rarr (3,4)` , B. `rarr (4,5)` , C. `rarr (2)` , D. `rarr (1)` A. Acid rain is due to oxides of carbon, sulphur (unsaturated hydrocarbon) and nitrogen B. Photochemical smog is formed by unburnt hydrocarbon and `SO_(2)`. C. Carbon monoxide with haemoglobin is poisonous. D. Chlorofluorocarbon `(CHCl_(2)-CHF_(2))` cause ozone depletion. |
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| 514. |
Ozone is a toxic gas and is a strong oxidising agent even then its present in the stratosphere is very important. Explain what would happen if ozone from this region is completely removed ? |
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Answer» (a) If ozone is completely removed from the stratosphere region, highly penetrating ultraviolet (U.V) radiations will have a direct assess to our planet i.e. earth. They will lead to large number of diseases and sufferings in human beings and also to the destruction of vegetation. (b)Nitric oxide converts ozone directly into oxygen. `NO_(2)+O_(3)rightarrowNO+2O_(2)` |
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| 515. |
Very toxic gas which causes headache, visual difficulty, paralysis and even death in the human beings is (A) `CO_(2)` (B) `O_(3)` (C) `CO`A. A & BB. AC. CD. B |
| Answer» Correct Answer - 3 | |
| 516. |
What is the % age of `CO_2` in the pure dry air? |
| Answer» Correct Answer - About 0.032% | |
| 517. |
Ozone destroying reaction is `O_(3)+O rarr 2O_(2)` This ozone destroying reaction can be due to (I) `NO` , (II) `CFCs` , (III) `N_(2)` Select the correct gases.A. Only IIB. I,II and IIIC. Both I and IIID. Both I and II |
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Answer» Correct Answer - D `O_(2)+UV "radiation" rarr O_(2)+O` `O_(3)+O rarr 2O_(2), Delta H=-390.0 kJ` In this process, heat is released into the atmosphere. NO also depletes `O_(3)` layere. `{:(NO+O_(3)toNO_(2)+O_(2)),(NO_(2)+Oto NO+O_(2)),(ulbar(O_(3)+Oto2O_(2)" ")):}` `NO` is produced by combustion in supersonic jets operating in the stratosphere. `CFSs` (chlorofluorocarbons as freons) are being used as refregerants and aerosols. They have very long lifetime and rise to the stratosphere in low concentrations, where they can absorb `UV` radiation and dissociate. `C Cl_(2)F_(2)+UV "radiation"to overset(● )(C) ClF_(2)+Coverset(● )(l)` `{:(overset(● )(C)Cl+O_(3)to Cloverset(● )(O)+O_(2)),(Cloverset(● )(O)+OtoCoverset(● )(l)+O_(2)+O_(2)),(O_(3)+Oto2O_(2)):}` |
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| 518. |
The dissolution of ozone layer causes ozone hole in the blanket surrounding the atmosphere . What are the till efffects of ozone hole ?A. Green house effectB. Global warmingC. Acid rainD. UV rays reaching the earth . |
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Answer» Correct Answer - D Ozone hole would allow the harmful UV rays of sum to reach the earth which cause skin cancer . |
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| 519. |
Which of the following free radicals is responsible for causing break down of ozone into oxygen due to use of CFCs ?A. OB. ClC. `CH_(3)`D. OH |
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Answer» Correct Answer - B ` CF_(2) Cl_(2) overset ("UV") to overset (.) Cl + CF_(2)overset (.)Cl overset (.)Cl + O_(3) to ClO + O_(2) , ClO + O to Cl +O_(2)` The chlorine radicals are continuosly regenerated and cause the break down of ozone . |
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| 520. |
Minamata disease is due to pollution ofA. arsenic into the atmosphereB. organic waste inot drinking waterC. oil spill in waterD. Industrial waste lead into fishing water |
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Answer» Correct Answer - D Minamata is caused by `Hg` poisoning. |
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| 521. |
Minamata disease is due to pollution ofA. organic waste in to dirinking waterB. oil spill in waterC. industrial waste ocntaining mercury into fishing waterD. Arsenic into the atmosphere |
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Answer» Correct Answer - C Minamata disease is due to pollution of industrial waste mercury into fishing water |
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| 522. |
In Minamata Bay, Japan, which of the following animals remained tree from Minamata diseaseA. DogsB. RabbitsC. CatsD. Pigs |
| Answer» Correct Answer - B | |
| 523. |
Carbon monoxide is pollutant as it:A. inactives nervesB. inhibts glycolysisC. combines with oxygenD. combines with haemoglobin |
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Answer» Correct Answer - D Carbon monocxide combines with haemoglobin to form carboxyhaemoglobin which is about 300 times more stabe than oxyhaemoglobin. This stable complex reduces the oxygen carrying capacity of blood. This oxygen deficiency causes headache,weak eysight nervousness and cardiovascular disorder. |
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| 524. |
Carbon monoxide (CO) is harmful to man becauseA. It forms carbonic acidB. It generates excess `CO_2`C. It is carcinogenicD. It competes with `O_2` for haemoglobin |
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Answer» Correct Answer - D CO is highly toxic and impairs respiration CO Combine with haemoglobin of blood and reduces its `O_2` carry capacity |
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| 525. |
Minamata disease is a pollution related disease results fromA. Accumulation of arsenic into atmosphereB. Oil spills into seaC. Release of industrial waste mercury into fishing waterD. Release human organic waste into drinking water |
| Answer» Correct Answer - C | |
| 526. |
Photochemical smog is related to the pollution ofA. NoiseB. WaterC. SoilD. Air |
| Answer» Correct Answer - D | |
| 527. |
Carbon monoxide is a pollutant becauseA. It reacts with `O_2`B. It inhibits glycolysisC. Reacts with haemoglobinD. Makes nervous system inactive |
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Answer» Correct Answer - C Carbon monoxide is the main air pollutant. It first reduces the oxygen carrying capacity of haemoglobin and then causes asphyxiation. |
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| 528. |
Which of the following is pollution related disorderA. HypertensionB. LeprosisC. SilicosisD. Pneumoconiosis |
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Answer» Correct Answer - C Silicosis is caused by inhalation of dust containing free silica or silicon dioxide especially by workers engaged in mining, pottery, ceramic industry, sand blasting, building and construction industries. |
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| 529. |
Which of the following country is responsible for releasing largest amount of greenhouse gasesA. RussiaB. BrazilC. GermanyD. America (USA) |
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Answer» Correct Answer - D Because USA is the largest consumer of fuel energy |
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| 530. |
Greenhouse gases causeA. Trap UV raysB. Increase in temperature of atmosphereC. Prevetns global warmingD. All of these |
| Answer» Correct Answer - B | |
| 531. |
Which of the following statements about photochemical smog is not correct ?A. It occurs in warm , dry and sunny climate .B. Chemically , it is a reducing mixture and is called reducing smog.C. It is formed as a result of action of sunlight on unsaturated hyfrocarbons and nitrogen oxides .D. It has high cncentration of oxidising agents and is also called oxidising smog. |
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Answer» Correct Answer - B Classical smog is a reducing smog. |
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| 532. |
Which forms the part of hazy fumes of photochemical smog?A. `SO_(2)`B. AldehydesC. PAN formationD. Nitrogen dioxide |
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Answer» Correct Answer - D `NO_(2)` forms a parts of photochemical smog. |
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| 533. |
The brown , hazy fumes of photochemical smog are due toA. nitrogen dioxideB. PAN formationC. aldehydesD. `SO_(2)` |
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Answer» Correct Answer - A Brown hazy fumes of photochemical smog are due to nitrogen dioxide . |
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| 534. |
Assertion (A) : Excessive use of chlorinated synthetic pesticides causes soil and water pollution. Reason (R) : Such pesticides are non-biodegradable.Both A and R are correct and R is the correct explanation of A.a)Both A and R are correct and R is the correct explanation of A.b).Both A and R are correct but R is not the correct explanation of A.c)Both A and R are not correct.d)A is not correct but R is correct.A. Both A and R are correct and R is the correct explanation of A.B. Both A and R are correct but R is not the correct explanation of A.C. Both A and R are not correct.D. A is not correct but R is correct. |
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Answer» Correct Answer - A Reason is the correct explanation for assertion |
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| 535. |
(a)Which chemical substances is present as enamel on the surface of the teeth ? (b)Traces of fluoride ions `(F^-)` in drinking water (about 1 ppm) greatly reduce the incidence dental cavities (tooth decay ) . What is the reason for reduction in cavities ? |
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Answer» (a)The chemical substance present as enamel on the surface of the teeth is `3 Ca_3(PO_4)_2 . Ca(OH)_2` (b)The fluoride ions `(F^-)` convert to enamel to much harder `3Ca_3(PO_4)_2. CaF_2` . Hence, the incidence cavities is greatly reduced. |
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| 536. |
Decomposition of organic matter through microbial activity is known asA. EutrophicationB. StratificationC. PutrescibilityD. BOD |
| Answer» Correct Answer - C | |
| 537. |
Tooth decay is caused by deficiency ofA. FluoridesB. LeadC. SulphatesD. Nitrates |
| Answer» Correct Answer - A | |
| 538. |
Match the upper limit concentrations of the pollutants in drinking water given in column I with pollutants in drinking water given in column I with column II mark the appropriate choice . A. `(A)to (ii) , (B) to (iii), (C ) to (i) , (D ) to (iv)`B. `(A) to (iii) , (B) to (i) , (C ) to (iv), (D) to (ii)`C. `(A) to (i),(B) to (iv) , (C ) to (iii) , (D) to (ii)`D. `(A) to (iv),(B) to (ii) , (C ) to (iii) , (D) to (i)` |
| Answer» Correct Answer - B | |
| 539. |
Assertion: The deficiency of fluoride in drinking water cause disease such as tooth decay etc. Reason: The `F^(-)` ions make the enamel on teeth much harder by converting hydroxyapatite, the enamal on the surface of the teeth, into much harder fluorapatite.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 - A `[3(Ca_(3)(PO_4)_(2) gt Ca(OH)_(2)] underset(F^(-))(rarr) [3Ca_(3)(PO_4)_(2).CaF_(2)]` |
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| 540. |
Permissible level of nitrate ions in the drinking water isA. 40 ppmB. 50ppmC. 60ppmD. 70ppm |
| Answer» Correct Answer - B | |
| 541. |
Choose the incorrect match for maximum prescribed concentration of some metals in drinking water. A. (i), (vi) onlyB. (v) onlyC. (vi) onlyD. (iii), (iv) only |
| Answer» Correct Answer - C | |
| 542. |
BOD. is connected withA. Organic matterB. MicrobesC. Both (a) and (b)D. None of these |
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Answer» Correct Answer - C Biological oxygen demand is related with organic matter and microbes.It indicates water pollution. As such as BOD increased then it indicates that water pollution is also increased. |
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| 543. |
Excess nitrate in drinking water can causeA. MethemoglobinemiaB. Kidney damageC. Liver damageD. Laxative effect |
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Answer» Correct Answer - A Excessive concentration of nitrate in drinking water is harmful and can cause methemoglobinemia (blue baby syndrome) |
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| 544. |
Frequent occurrence of water blooms in a lake indicatesA. Nutrient deficiencyB. Oxygen deficiencyC. Excessive nutrient availabilityD. Absence of herbivores in the lake |
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Answer» Correct Answer - B In polluted water nitrogen and phosphorus (from sewage) are accumulated which results in excessive growth of algae on water surface. Excessive growth of algae called water bloom. Due to death and decomposition of organic matter `O_2` not available to aquatic animals |
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| 545. |
Excessive accumulation of organic matter in water bodies leads toA. Decrease in species diversityB. Increase in species diversityC. Green house effectD. No effect on species diversity |
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Answer» Correct Answer - A Organic matter (organic wastes) contains a number of pathogen, secondary pollutant, pesticides etc. Biological oxygen demand becomes high, and therefore the dissolved oxygen reduced. Hence, planktons Mollusca and fishes will be eliminated due to reduced dissolved oxygen and presence of secondary pollutants. Some species like annelid worm Tubifex and some insect larvae (Chironomus) tolerate pollution |
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| 546. |
B.O.D. test or biochemical oxygen demand test is made for measuringA. Noise pollutionB. Water pollutionC. Air pollutionD. Soil pollution |
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Answer» Correct Answer - B Strength of sewage or degree of water pollution is measured in terms of BOD (Biochemical oxygen demand) value |
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| 547. |
Limit of BOD prescribed by Central Pollution Control Board for the discharge of industrial and municipal waste waters into natural surface waters isA. lt3.0 ppmB. lt30 ppmC. lt100 ppmD. lt10 ppm |
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Answer» Correct Answer - B Water pollution is mainly caused by industrial wastes, sewage, insecticide, herbicides , etc. |
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| 548. |
The disease caused by oxygen starvation due to presence of 750 ppm or more carbon monoxide is called_________ |
| Answer» Correct Answer - anoxia or asphyxiation | |
| 549. |
Which of the following is not a consequence of greenhouse effect?A. Climatic conditions will be changed.B. Plants in warmer climates with adequate rainfall would grow faster.C. The incidence of infectious diseases is likely to increase.D. Malaria will be controlled as the mosquitos will not survive. |
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Answer» Correct Answer - D The mosquitoes will increases their population and spread malaria. |
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| 550. |
When rain is accompained by a thunderstorm, the collected rain water will have a `pH`:A. uninfluenced by occurrence of thusnderstromB. which depends on the amount of dust in airC. slightly lower that of rain water without thunderstromD. slightly higher than that when the thunderstorm is not there |
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Answer» Correct Answer - C During thunderstorm` O_(2) and N_(2)` combine to form oxides of nitrogen .These oxides of nitrogen dissolve in rain water to form nitric acid which lowers the pH of rain water |
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