The oxygen d issoc iat ion curve for hemoglobin is shifted to the right by (A) Decreased O2 tension (B) Decreased CO2 tension (C) Increased CO2 tension (D) Increased pH

The oxygen d issoc iat ion curve for hemoglobin is shifted to the right by (A) Decreased O2 tension (B) Decreased CO2 tension (C) Increased CO2 tension (D) Increased pH
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A 45-year-old solicitor had an onset of severe, crushing, substernal chest pain while attending a football match. He collapsed on his way to the car. Bystander Cardiorespiratory Resuscitation was begun immediately and continued until arrival in Casualty where an endotracheal tube was inserted and ventilation was maintained on 100% oxygen. Investigations revealed: pH 7.13 PaO2 560 mmHg PaCO2 18 mmHg Bicarbonate 5.8 SaO2 98% Based on these laboratory values, which of the following statements best describes his current pathophysiology? 1) He is demonstrating a primary respiratory alkalosis 2) He probably developed a large right to left intracardiac shunt 3) His anion gap is probably normal 4) His oxyhemoglobin curve is shifted to the left 5) His pulmonary artery pressure is probably elevated

Description : A 45-year-old solicitor had an onset of severe, crushing, substernal chest pain while attending a football match. He collapsed on his way to the car. Bystander Cardiorespiratory Resuscitation ... His oxyhemoglobin curve is shifted to the left 5) His pulmonary artery pressure is probably elevated

Last Answer : Answers-5 This young patient with severe central chest pain has probably arrested due to myocardial infarction and arrhythmia. His gases reveal high PO2 following 100% O2 but severe acidosis ... no left to right shunting and high pulmonary pressures would be expected after this arrest scenario.

2, 3-Biphosphoglycerate in high concentrations, combines with hemoglobin, causes (A) Displacement of the oxyhemoglobin dissociation curve to the left (B) Displacement of the oxyhemoglobin dissociation curve to the right (C) No change in oxy hemoglobin dissociation curve (D) Increased affinity for oxygen

Description : 2, 3-Biphosphoglycerate in high concentrations, combines with hemoglobin, causes (A) Displacement of the oxyhemoglobin dissociation curve to the left (B) Displacement of the oxyhemoglobin dissociation curve ... (C) No change in oxy hemoglobin dissociation curve (D) Increased affinity for oxygen

Last Answer : Answer : B

Bohr effect is (A) Shifting of oxyhemoglobin dissociation curve to the right (B) Shifting of oxyhemoglobin dissociation curve to the left (C) Ability of hemoglobin to combine with O2 (D) Exchange of chloride with carbonate

Description : Bohr effect is (A) Shifting of oxyhemoglobin dissociation curve to the right (B) Shifting of oxyhemoglobin dissociation curve to the left (C) Ability of hemoglobin to combine with O2 (D) Exchange of chloride with carbonate

Last Answer : Answer : A

After re leas ing O2 at the tissues, hemoglobin transports (A) CO2 and protons to the lungs (B) O2 to the lungs (C) CO2 and protons to the tissue (D) Nutrients

Description : After re leas ing O2 at the tissues, hemoglobin transports (A) CO2 and protons to the lungs (B) O2 to the lungs (C) CO2 and protons to the tissue (D) Nutrients

Last Answer : Answer : A

The oxygen dissociation curve is shifted to the right with: a. polycythaemia b. pyrexia c. respiratory acidosis d. sickle cell anaemia

Description : The oxygen dissociation curve is shifted to the right with: a. polycythaemia b. pyrexia c. respiratory acidosis d. sickle cell anaemia

Last Answer : pyrexia

Use of hydrated lime in water treatment (A) Before filtration, reduces the bacterial load on filters (B) After filtration, combats the corrosiveness of water due to the presence of O2 & CO2 (C) Is to adjust the pH value (D) All (A), (B) and (C)

Description : Use of hydrated lime in water treatment (A) Before filtration, reduces the bacterial load on filters (B) After filtration, combats the corrosiveness of water due to the presence of O2 & CO2 (C) Is to adjust the pH value (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Compared to the resting state, vigorously contracting muscle shows (A) An increased conversion of pyruvate to lactate (B) Decreased oxidation of pyruvate of CO2 and water (C) A decreased NADH/NAD+ ratio (D) Decreased concentration of AMP CARBOHYDRATES AND CARBOHYDRATE METABOLISM 21

Description : Compared to the resting state, vigorously contracting muscle shows (A) An increased conversion of pyruvate to lactate (B) Decreased oxidation of pyruvate of CO2 and water (C) A decreased NADH/NAD+ ratio (D) Decreased concentration of AMP CARBOHYDRATES AND CARBOHYDRATE METABOLISM 21

Last Answer : A

All the following changes in blood chemistry can occur in severe diarrhoea except (A) Decreased pH (B) Decreased bicarbonate (C) Increased pCO2 (D) Increased chloride WATER AND ELECTROLYTE BALANCE 287

Description : All the following changes in blood chemistry can occur in severe diarrhoea except (A) Decreased pH (B) Decreased bicarbonate (C) Increased pCO2 (D) Increased chloride WATER AND ELECTROLYTE BALANCE 287

Last Answer : Answer : C

Rank the following laboratory tests and procedures in terms of their relative value to a 65-year-old woman who is to undergo elective resection of a sigmoid cancer. A. Carcinoembryonic antigen (CEA). B. Blood urea nitrogen (BUN). C. Electrocardiogram (ECG). D. Hemoglobin concentration (Hgb). E. Serum creatinine (Cr). F. Arterial blood oxygen tension (PaO 2) on room air. G. Serum sodium concentration (Na+).

Description : Rank the following laboratory tests and procedures in terms of their relative value to a 65-year-old woman who is to undergo elective resection of a sigmoid cancer. A. Carcinoembryonic antigen (CEA). B. ... Arterial blood oxygen tension (PaO 2) on room air. G. Serum sodium concentration (Na+).

Last Answer : Answer: CDFEBAG DISCUSSION: The most important test by far is the electrocardiogram, with its capacity to indicate signs of occult heart disease. The second most important evaluation is the hemoglobin ... for resection of the colon is always normal and would be of least value among these tests

What is true about RBCs in humans? (a) They carry about 20-25 percent of CO2. (b) They transport 99.5 percent of O2. (c) They transport about 80 percent oxygen only and the rest 20 percent of it is transported in dissolved state in blood plasma. (d) They do not carry CO2 at all.

Description : What is true about RBCs in humans? (a) They carry about 20-25 percent of CO2. (b) They transport 99.5 percent of O2. (c) They transport about 80 percent oxygen only and the rest 20 percent of it is transported in dissolved state in blood plasma. (d) They do not carry CO2 at all.

Last Answer : (a) They carry about 20-25 percent of CO2.

Identify the wrong statement with reference to transport of oxygen. (a) Binding of oxygen with haemoglobin is mainly related to partial pressure of O2. (b) Partial pressure of CO2 can interfere with O2 binding with haemoglobin. (c) Higher H+ conc. in alveoli favours the formation of oxyhaemoglobin. (d) Low pCO2 in alveoli favours the formation of oxyhaemoglobin.

Description : Identify the wrong statement with reference to transport of oxygen. (a) Binding of oxygen with haemoglobin is mainly related to partial pressure of O2. (b) Partial pressure of CO2 can interfere ... the formation of oxyhaemoglobin. (d) Low pCO2 in alveoli favours the formation of oxyhaemoglobin.

Last Answer : (c) Higher H+ conc. in alveoli favours the formation of oxyhaemoglobin.

The figure given below shows a small part of human lung where exchange of gases takes place. Select the option which represents labelled part (A, B, C or D) correctly identified along with its function. (a) C : Arterial capillary - Passes oxygen to tissues (b) A : Alveolar cavity - Main site of exchange of respiratory gases (c) D : Capillary wall - Exchange of O2 and CO2 takes place here (d) B : Red blood cells - Transport of CO2 mainly

Description : The figure given below shows a small part of human lung where exchange of gases takes place. Select the option which represents labelled part (A, B, C or D) correctly identified along with its function. ... Exchange of O2 and CO2 takes place here (d) B : Red blood cells - Transport of CO2 mainly

Last Answer : (b) A : Alveolar cavity - Main site of exchange of respiratory gases

R.Q. is ratio of (a) CO2 produced to substrate consumed (b) CO2 produced to O2 consumed (c) oxygen consumed to water produced (d) oxygen consumed to CO2 produced

Description : R.Q. is ratio of (a) CO2 produced to substrate consumed (b) CO2 produced to O2 consumed (c) oxygen consumed to water produced (d) oxygen consumed to CO2 produced

Last Answer : b) CO2 produced to O2 consumed

Volumetric composition of flue gas analysed with the Orsat apparatus is : CO2 = 12%, O2 = 8%, CO = nil, N2 = 80%. This flue gas composition indicates that (A) Pure oxygen has been used for combustion (B) Nitrogen percentage in the fuel is very high (C) Excess air has been used for combustion (D) Hydrogen is not present in the fuel

Description : Volumetric composition of flue gas analysed with the Orsat apparatus is : CO2 = 12%, O2 = 8%, CO = nil, N2 = 80%. This flue gas composition indicates that (A) Pure oxygen has been used for combustion ... very high (C) Excess air has been used for combustion (D) Hydrogen is not present in the fuel

Last Answer : (C) Excess air has been used for combustion

The point of ultra-supercritical steam generator is to save on coal to heat the water and reduce ________ emissions. a. Oxygen (O2) b. Water (H2O) c. Carbon dioxide (CO2) d. Both ‘a’ and ‘c’

Description : The point of ultra-supercritical steam generator is to save on coal to heat the water and reduce ________ emissions. a. Oxygen (O2) b. Water (H2O) c. Carbon dioxide (CO2) d. Both ‘a’ and ‘c’

Last Answer : c. Carbon dioxide (CO2)

This cause the depletion of ozone layer by decomposing ozone to oxygen . a) CFC b)UV radiations c)CO2 d)O2

Description : This cause the depletion of ozone layer by decomposing ozone to oxygen . a) CFC b)UV radiations c)CO2 d)O2

Last Answer : b)UV radiations

The percentage of CO2 carrying capacity of whole blood by hemoglobin and oxyhemoglobin is (A) 20 (B) 40 (C) 60 (D) 80

Description : The percentage of CO2 carrying capacity of whole blood by hemoglobin and oxyhemoglobin is (A) 20 (B) 40 (C) 60 (D) 80

Last Answer : Answer : C

An increase in the NH3 /CO2 ratio in urea manufacture results in (A) Increased degree of conversion of CO2 to urea (B) Decreased degree of conversion of NH3 to urea (C) Decreased yield of urea (D) Decreased specific volume of molten mass

Description : An increase in the NH3 /CO2 ratio in urea manufacture results in (A) Increased degree of conversion of CO2 to urea (B) Decreased degree of conversion of NH3 to urea (C) Decreased yield of urea (D) Decreased specific volume of molten mass

Last Answer : (A) Increased degree of conversion of CO2 to urea

Nitroglycerin, either directly or through reflexes, results in which one of the following effects (a) Decreased heart rate (b) Decreased venous capacitance (c) Increased afterload (d) Increased cardiac force (e) Increased diastolic intramyocardial fiber tension

Description : Nitroglycerin, either directly or through reflexes, results in which one of the following effects (a) Decreased heart rate (b) Decreased venous capacitance (c) Increased afterload (d) Increased cardiac force (e) Increased diastolic intramyocardial fiber tension

Last Answer : Ans: D

During accommodation: a. the distance between the lens and the ciliary body is decreased b. the tension in the suspensory ligament is increased c. the tension of the lens capsule is increased d. the refractive power of the lens is increased

Description : During accommodation: a. the distance between the lens and the ciliary body is decreased b. the tension in the suspensory ligament is increased c. the tension of the lens capsule is increased d. the refractive power of the lens is increased

Last Answer : the refractive power of the lens is increased

The average permissible stress in bond for plain bars in tension is (A) Increased by 10% for bars in compression (B) Increased by 25% for bars in compression (C) Decreased by 10% for bars in compression (D) Decreased by 25% for bars in compression

Description : The average permissible stress in bond for plain bars in tension is (A) Increased by 10% for bars in compression (B) Increased by 25% for bars in compression (C) Decreased by 10% for bars in compression (D) Decreased by 25% for bars in compression

Last Answer : Answer: Option B

What is the full form of IAT?

Description : What is the full form of IAT?

Last Answer : IAT 's full version Institute Of Air Transport.

Has the standard I Q bell curve shifted as this comment from a previous question states?

Description : Has the standard I Q bell curve shifted as this comment from a previous question states?

Last Answer : IQs seem to be steadily going up, but by how much depends on what kind of IQ test you’re looking at and the population you measure. This is called The Flynn Effect.

In multistage equilibrium conversion of SO2 to SO3 (2SO2 + O2 ⇌ 2SO3 ), the reverse reaction becomes appreciable at a temperature of 550° C. The percentage equilibrium conversion of SO2 to SO3 can be increased by (A) Increasing the oxygen concentration (B) Putting more quantity of V2O5 catalyst in the converter (C) Removing some quantity of SO3 during intermediate stage (D) Maintaining low temperature & pressure in the converter

Description : In multistage equilibrium conversion of SO2 to SO3 (2SO2 + O2 ⇌ 2SO3 ), the reverse reaction becomes appreciable at a temperature of 550° C. The percentage equilibrium conversion of SO2 to ... some quantity of SO3 during intermediate stage (D) Maintaining low temperature & pressure in the converter

Last Answer : (C) Removing some quantity of SO3 during intermediate stage

Can hemoglobin bind other gas molecules besides oxygen?

Description : Can hemoglobin bind other gas molecules besides oxygen?

Last Answer : Yes. Carbon dioxide (CO2) and carbon monoxide (CO) also bind to hemoglobin. Hemoglobin, when saturated with oxygen, is called oxyhemoglobin. It is cherry red in color. When oxyhemoglobin loses its ... has. It is this competitive exclusion of oxygen that makes carbon monoxide so dangerous a gas. 

The surface tension in intestinal lumen between fat droplets and aqueous medium is decreased by (A) Bile Salts (B) Bile acids (C) Conc. H2SO4 (D) Acetic acid

Description : The surface tension in intestinal lumen between fat droplets and aqueous medium is decreased by (A) Bile Salts (B) Bile acids (C) Conc. H2SO4 (D) Acetic acid

Last Answer : A

In a solution having a pH of 7.4, the hydrogen ion concentration is (A) 7.4 nmol/L (B) 40 nmol/L (C) 56 nmol/L (D) 80 nmol/L

Description : In a solution having a pH of 7.4, the hydrogen ion concentration is (A) 7.4 nmol/L (B) 40 nmol/L (C) 56 nmol/L (D) 80 nmol/L

Last Answer : Answer : B

The following technique makes use of the difference in net charges of proteins at a given pH: (A) Thin layer chromatography (B) Ion exchange chromatography (C) High performance liquid chromatography (D) Paper chromatography

Description : The following technique makes use of the difference in net charges of proteins at a given pH: (A) Thin layer chromatography (B) Ion exchange chromatography (C) High performance liquid chromatography (D) Paper chromatography

Last Answer : Answer : B

PH is the negative logarithm of the hydrogen Ion Concentration express4ed in moles/liter of aqueous solution. PH of buffer solution is calculated by. Henderson’s equation Name the best indicator Phenolphthalein, PH range 8.3 to 10.0 Chemical kinetics deals with study of. Rates and mechanisms of chemical and Biochemical reactions

Description : PH is the negative logarithm of the hydrogen Ion Concentration express4ed in moles/liter of aqueous solution. PH of buffer solution is calculated by. Henderson's equation Name the best ... Chemical kinetics deals with study of. Rates and mechanisms of chemical and Biochemical reactions

Last Answer : What does Thermodynamics helps in predicting ?

All the following features are found in blood chemistry in uncompensated lactic acidosis except (A) pH is decreased (B) Bicarbonate is decreased (C) pCO2 is normal (D) Anion gap is normal

Description : All the following features are found in blood chemistry in uncompensated lactic acidosis except (A) pH is decreased (B) Bicarbonate is decreased (C) pCO2 is normal (D) Anion gap is normal

Last Answer : Answer : D

All of the following statements about uric acid are true except (A) It can be formed from allantoin (B) Formation of uric acid stones in kidneys can be decreased by alkalinisation of urine (C) Uric acid begins to dissociate at pH above 5.8 (D) It is present in plasma mainly as monosodium urate

Description : All of the following statements about uric acid are true except (A) It can be formed from allantoin (B) Formation of uric acid stones in kidneys can be decreased by alkalinisation of urine (C) Uric acid begins to dissociate at pH above 5.8 (D) It is present in plasma mainly as monosodium urate

Last Answer : Answer : A

Answer: a, b, c, d Free oxygen radicals are chemical species that are intermediates in the normal process of cellular respiration. Oxidants that are free radicals have been implicated as initiators of reactions which lead to a variety of cellular injuries. Oxidants are derived from several sources, notably phagocytes. Among the effects of oxygen free radicals are membrane lipid peroxidation, DNA strand breaks, cytoskeletal disassembly and inhibition of glucose metabolism leading to decreased cellular ATP concentrations. (Figure 6-16) 187 Which of the following acute-phase protein levels are increased in human plasma following acute inflammation? a. C-reactive protein b. Serum amyloid c. a -Proteinase inhibitor d. Fibrinogen e. Albumin

Description : Answer: a, b, c, d Free oxygen radicals are chemical species that are intermediates in the normal process of cellular respiration. Oxidants that are free radicals have been implicated as initiators of ... a. C-reactive protein b. Serum amyloid c. a -Proteinase inhibitor d. Fibrinogen e. Albumin

Last Answer : Answer: a, b, c, d The acute-phase response is a series of homeostatic responses of the organism to tissue injury in infection and inflammation. After an inflammatory stimulus occurs, a number ... 30% to 50% of the level before injury. The reason for the decrease in production is poorly understood

For individuals known to be dying by virtue of age and/or diagnoses, which of the following signs indicate approaching death: a) Increased restlessness As the oxygen supply to the brain decreases, the patient may become restless. b) Increased wakefulness As the body weakens, the patient will sleep more and begin to detach from the environment. c) Increased eating For many patients, refusal of food is an indication that they are ready to die. d) Increased urinary output Based upon decreased intake, urinary output generally decreases in amount and frequency.

Description : For individuals known to be dying by virtue of age and/or diagnoses, which of the following signs indicate approaching death: a) Increased restlessness As the oxygen supply to the ... Increased urinary output Based upon decreased intake, urinary output generally decreases in amount and frequency.

Last Answer : a) Increased restlessness As the oxygen supply to the brain decreases, the patient may become restless.

What compounds can copper form with a O2 ion?

Description : What compounds can copper form with a O2 ion?

Last Answer : Copper oxides are CuO and Cu2O.

Deaeration (removal of O2 ) of water is done by (A) Rectification (B) Absorption (C) Ion-exchange (D) Adsorption

Description : Deaeration (removal of O2 ) of water is done by (A) Rectification (B) Absorption (C) Ion-exchange (D) Adsorption

Last Answer : (C) Ion-exchange

How many electrons are there in the valence shell of the O2– ion? A 2 B 8 C 10 D 16 E 18

Description : How many electrons are there in the valence shell of the O2– ion? A 2 B 8 C 10 D 16 E 18

Last Answer : B 8 

At pH 7.4, the ratio of bicarbonate : dissolved CO2 is (A) 1 : 1 (B) 10 : 1 (C) 20 : 1 (D) 40 : 1

Description : At pH 7.4, the ratio of bicarbonate : dissolved CO2 is (A) 1 : 1 (B) 10 : 1 (C) 20 : 1 (D) 40 : 1

Last Answer : Answer : C

Can humans survive breathing an 80/20 mix of CO2 and O2?

Description : Can humans survive breathing an 80/20 mix of CO2 and O2?

Last Answer : Humans breath Air which is a mixture of about 78% Nitrogen, 21% Oxygen and trace other gases including 0.03% Carbon Dioxide. Much higher levels of Oxygen would make it easy for things to catch ... can tolerate a higher level because they use the Carbon Dioxide. and water to make sugars and cells.

If 48.0 g of O2 and 4.4 g of CO2 are placed in a 10.0 L container at 21c. what is the pressure of mixture of gases?

Description : If 48.0 g of O2 and 4.4 g of CO2 are placed in a 10.0 L container at 21c. what is the pressure of mixture of gases?

Last Answer : Need answer

What of the following reactions demonstrates a synthesis reaction A) Mg plus H2SO4 and gt MgSO4 plus H2 B) 2NaCl and gt 2Na plus Cl2 C) C plus O2 and gt CO2 D) Zn plus 2HCl and gt ZnCl2 plus H2?

Description : What of the following reactions demonstrates a synthesis reaction A) Mg plus H2SO4 and gt MgSO4 plus H2 B) 2NaCl and gt 2Na plus Cl2 C) C plus O2 and gt CO2 D) Zn plus 2HCl and gt ZnCl2 plus H2?

Last Answer : C+O2 →CO2

If you start with 32 grams of CH4 and react it with O2 to form 88 grams CO2 and 72 grams H2O. How much O2 in grams was consumed?

Description : If you start with 32 grams of CH4 and react it with O2 to form 88 grams CO2 and 72 grams H2O. How much O2 in grams was consumed?

Last Answer : 128 g of oxygen are needed.

If you start with 32 grams of CH4 and react it with O2 to form 88 grams CO2 and 72 grams H2O. How much O2 in grams was consumed?

Description : If you start with 32 grams of CH4 and react it with O2 to form 88 grams CO2 and 72 grams H2O. How much O2 in grams was consumed?

Last Answer : 128 g of oxygen are needed.

Tubercular bacilli grow best in a. Absence of O2 b. Presence of CO2 c. Presence of O2 d. None of these

Description : Tubercular bacilli grow best in a. Absence of O2 b. Presence of CO2 c. Presence of O2 d. None of these

Last Answer : Ans: B

In a petrol engine, which of the following gas gets exhausted out without burning and without transformation? a. CO2 b. CO c. O2 d. N2

Description : In a petrol engine, which of the following gas gets exhausted out without burning and without transformation? a. CO2 b. CO c. O2 d. N2

Last Answer : ANSWER d. N2

Blood haemoglobin has high affinity for (a) CO2 (b) CO (c) O2 (d) H

Description : Blood haemoglobin has high affinity for (a) CO2 (b) CO (c) O2 (d) H

Last Answer : Ans:(b)

O2 released in the process of photosynthesis comes from (a) CO2 (b) Water (c) Sugar (d) Pyruvic acid

Description : O2 released in the process of photosynthesis comes from (a) CO2 (b) Water (c) Sugar (d) Pyruvic acid

Last Answer : Ans:(b)

The balance of CO2 and O2 in atmosphere is due to _____. (1) Transportation (2) Photosynthesis (3) Respiration (4) Evaporation

Description : The balance of CO2 and O2 in atmosphere is due to _____. (1) Transportation (2) Photosynthesis (3) Respiration (4) Evaporation

Last Answer : (2) Photosynthesis Explanation: Photosynthesis takes in the carbon dioxide produced by all breathing organisms and reintroduces oxygen into the atmosphere.

Photo chemical smog is a result-ant of the reaction among – (1) High concentration of NO2, O3, and CO in the evening (2) CO, CO2 and NO2 at low temperature (3) CO, O2 and peroxy acetyl nitrate in the presence of Sunlight (4) NO2, O3 and peroxy acetyl nitrate in the presence of Sunlight

Description : Photo chemical smog is a result-ant of the reaction among – (1) High concentration of NO2, O3, and CO in the evening (2) CO, CO2 and NO2 at low temperature (3) CO, O2 and peroxy acetyl nitrate in the presence of Sunlight (4) NO2, O3 and peroxy acetyl nitrate in the presence of Sunlight

Last Answer : (4) NO2, O3 and peroxy acetyl nitrate in the presence of Sunlight Explanation: Photochemical smog is a unique type of air pollution which is caused by reactions between sunlight and pollutants like hydrocarbons and nitrogen dioxide (NO and NO2).

Which of the following is not a greenhouse gas? (1) Water vapour (2) O2 (3) O3 (4) CO2

Description : Which of the following is not a greenhouse gas? (1) Water vapour (2) O2 (3) O3 (4) CO2

Last Answer : (2) O2 Explanation: Greenhouse gases are those that can absorb and emit infrared radiation, but not radiation in or near the visible spectrum. The most abundant greenhouse gases in Earth's atmosphere are: Water ... , Carbon dioxide (CO2), Methane (CH4), Nitrous oxide (N2O), Ozone (O3) and CFCs.

Supersonic jet causes pollution by thinning of - (1) O3 layer (2) O2 layer (3) SO2 layer (4) CO2 layer

Description : Supersonic jet causes pollution by thinning of - (1) O3 layer (2) O2 layer (3) SO2 layer (4) CO2 layer

Last Answer : (1) O3 layer Explanation: Three forms (or allotropes) of oxygen are involved in the ozone-oxygen cycle: oxygen atoms (O or atomic oxygen), oxygen has (O2 or diatomic oxygen), and ... oxygen radicals. The atomic oxygen radicals then combine with separate O2 molecules to create two O3 molecules.