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Air pollution: gaseous pollutants, acid rain, smog

55 questions on Air pollution: gaseous pollutants, acid rain, smog from the Environmental Chemistry chapter: 11 NEET level, 22 JEE Main, 22 JEE Advanced. Each one opens with its answer and solution.

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Which gas combines with haemoglobin of blood to form carboxyhaemoglobin? NEET level
The pH of normal (unpolluted) rain water is about 5.6. This slight acidity is due to the dissolved NEET level
Which pair of gases is mainly responsible for acid rain? NEET level
Which of the following is present in photochemical smog but not in classical smog? NEET level
Classical (London type) smog is called reducing smog mainly because it contains NEET level
In the cylinders of an automobile engine, nitric oxide is formed by the reaction of NEET level
Fine liquid droplets suspended in air, formed by condensation or by atomisation of liquids, are called NEET level
According to the standard NCERT treatment, which of the following trees can metabolise nitrogen oxide and so help reduce air pollution? NEET level
In the catalytic converter of a car, the oxides of nitrogen in the exhaust are finally converted into NEET level
Cars fitted with catalytic converters must use unleaded petrol because lead compounds NEET level
In the atmosphere, SO2 is oxidised to SO3 in the presence of particulate matter, and the SO3 then reacts with water vapour to give NEET level
The first step of the chain of reactions leading to photochemical smog is the photolysis NO2 ->[hnu] X + Y. The species X and Y are JEE Main level
In photochemical smog, ozone formed in the troposphere reacts with nitric oxide. The products are JEE Main level
Assertion (A): Classical smog is a reducing smog. Reason (R): It contains sulphur dioxide, which is a reducing agent, along with smoke from burning coal. JEE Main level
Assertion (A): Photochemical smog is formed in warm, dry and sunny weather. Reason (R): Hydrocarbons are present in vehicle exhaust. JEE Main level
Match the pollutant in Column I with its characteristic effect or property in Column II. Column I: (P) CO; (Q) SO2; (R) PAN; (S) NO2. Column II: (1) irritates e... JEE Main level
Peroxyacetyl nitrate (PAN), CH3COOONO2, is formed in photochemical smog when the peroxyacetyl radical CH3COO2. reacts with JEE Main level
Rain water of pH 4.4 is compared with normal rain of pH 5.6. Using 10^1.2 = 15.8, the hydrogen ion concentration of the polluted rain is about JEE Main level
Assume that all the SO2 emitted is oxidised to SO3 and then converted into H2SO4. Using S = 32, O = 16, H = 1, the mass of H2SO4 that can form from 1.00 kg of S... JEE Main level
In a wet scrubber, flue gas is passed through limestone slurry and no oxygen is supplied, so the oxidation state of sulphur does not change. The sulphur contain... JEE Main level
Which of the following oxides is NOT a direct contributor to the formation of acid rain? JEE Main level
In the atmosphere, nitrogen dioxide reacts with water according to 3NO2 + H2O -> 2HNO3 + X. The compound X is JEE Main level
Which of the following is a secondary pollutant? JEE Main level
Carbon monoxide is highly toxic because it JEE Main level
Which of the following is a viable particulate pollutant? JEE Main level
In a catalytic converter the reaction 2CO + 2NO -> 2CO2 + N2 occurs. The total number of electrons transferred (from the species oxidised to the species reduced... JEE Main level
Marble (calcium carbonate) is attacked by sulphuric acid present in acid rain. The products are JEE Main level
Which of the following statements about classical (London type) smog are correct? JEE Main level
Which of the following are constituents of photochemical smog? JEE Main level
Which of the following correctly describe methods of controlling vehicular or industrial pollution? JEE Main level
Which of the following statements about carbon monoxide are correct? JEE Main level
Which of the following statements about acid rain are correct? JEE Main level
Rain water contains sulphuric acid at a concentration of 2.5x10^-5 mol L^-1 and no other acid or base. Assume H2SO4 is fully dissociated in both steps and negle... JEE Main level
A colourless gas X is formed from atmospheric nitrogen and oxygen in a hot engine. In air X is oxidised to a reddish brown gas Y. In sunlight Y splits into X an... JEE Advanced level
Consider the steps (1) NO2 ->[hnu] NO + O, (2) O + O2 -> O3, (3) O3 + NO -> NO2 + O2. In an atmosphere containing only NO, NO2, O2 and sunlight (no hydrocarbons... JEE Advanced level
In urban air containing hydrocarbons, ozone accumulates to harmful levels in photochemical smog. The best explanation is that JEE Advanced level
One tonne (1000 kg) of coal contains 1.6 % sulphur by mass. All of the sulphur burns to SO2, all of which is later oxidised and converted into H2SO4 in rain. Us... JEE Advanced level
Two rain samples are mixed: 1.0 L of pH 4.0 and 9.0 L of pH 5.0. Ignoring any reaction other than mixing and using log 1.9 = 0.279, the pH of the mixture is JEE Advanced level
A gas X from a coal fired power plant turns acidified potassium dichromate paper green and decolourises acidified KMnO4. When X is oxidised and dissolved in rai... JEE Advanced level
Assertion (A): Sulphur dioxide emitted from a coal fired plant can cause acid rain at places hundreds of kilometres away. Reason (R): SO2 is oxidised to SO3 onl... JEE Advanced level
Match the pollutant or source in Column I with the control measure or fate in Column II. Column I: (P) SO2 in flue gas; (Q) fly ash; (R) CO and unburnt hydrocar... JEE Advanced level
A power plant flue gas contains 0.064 % SO2 by mass. It is treated with hydrogen peroxide: SO2 + H2O2 -> H2SO4. Using S = 32, O = 16, H = 1, the mass of H2O2 (m... JEE Advanced level
A rain sample of pH 4.00 contains nitric acid at 4.0x10^-5 mol L^-1 and sulphuric acid, with no other acid or base. Assume complete dissociation of both acids (... JEE Advanced level
An air sample analysed at noon in a sunny city shows a strong peak of ozone and peroxyacetyl nitrate, little sulphur dioxide, and high levels of nitrogen oxides... JEE Advanced level
Which statement correctly contrasts ozone in the two regions of the atmosphere? JEE Advanced level
Which of the following pairings of a particulate with its class is correct? JEE Advanced level
A 250 L sample of air measured at STP contains 1.10 mg of SO2 (assume ideal gas, molar volume 22.4 L/mol at STP, S = 32, O = 16). The concentration of SO2 in pp... JEE Advanced level
A lake of volume 1.0x10^6 L has pH 4.0 owing to acid rain. To neutralise the H+ present by adding limestone (CaCO3, molar mass 100, CaCO3 + 2H+ -> Ca^2+ + H2O +... JEE Advanced level
Which of the following steps and statements about the photochemical smog chain are correct? JEE Advanced level
A gas X is colourless with a pungent smell, turns acidified K2Cr2O7 green and is emitted on burning sulphur containing coal. Which statements about X are correc... JEE Advanced level
Which of the following statements about types of particulate pollutants are correct? JEE Advanced level
A sample of rain has pH 4.2. Take 10^1.4 = 25.1 and K_w = 1.0x10^-14 at the temperature of measurement. Which statements are correct? JEE Advanced level
Which of the following chemical equations for the formation of acid rain components and their action are correct and balanced? JEE Advanced level
Which of the following statements about control of air pollution are correct? JEE Advanced level
A building clad in marble is exposed to 3700 L of acid rain containing H2SO4 at 2.5x10^-4 mol L^-1 and HNO3 at 1.0x10^-4 mol L^-1. Assume both acids are fully d... JEE Advanced level