Q145. The term 'ozone hole' refers to:Chemistry — NUST Mock By IBAGRADS 3 — Question 145 of 200A. A literal hole in the ozone layerB. A reduction in the thickness of the ozone layer in the stratosphereC. A reduction in the thickness of the ozone layer in the troposphereD. An increase in the concentration of ozonePractice more Chemistry MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →