GATE CE 2021 Set 2 — Question 27
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Question
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(A) Increased levels of carbon monoxide in the indoor environment result in the formation of carboxyhemoglobin and the long term exposure becomes a cause of cardiovascular diseases.; (B) Volatile organic compounds act as one of the precursors to the formation of photochemical smog in the presence of sunlight.; (C) Long term exposure to the increased level of photochemical smog becomes a cause of chest constriction and irritation of the mucous membrane.
Solution
Statement (B) is correct: Photochemical smog is formed by the reaction of volatile organic compounds (VOCs) and nitrogen oxides () in the presence of sunlight.
Statement (C) is correct: Photochemical smog contains ozone and other oxidants that are respiratory irritants, causing chest constriction and irritation of mucous membranes.
Statement (D) is incorrect: Photochemical smog formation requires sunlight and , which are typically not present in sufficient concentrations indoors for VOCs to form smog. Furthermore, smog is primarily a respiratory irritant rather than a direct cause of cardiovascular disease compared to CO.
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