39. Green house effect is accelerated by A.Deforestation B.Rapid industrialization C.Increased transportation activity D.All of these
Answer: Option A Solution: In chemistry, pH is a numeric scale used to specify the acidity or basicity of an aqueous solution. Solutions with a pH less than 7 are acidic and solutions with a pH greater than 7 are basic. Pure water is neutral, being neither an acid nor basic; so it has pH value of 7.
