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(D) Normal rain water has a $pH$ of about $5.6$ due to the presence of dissolved $CO_2$ which forms weak carbonic acid $(H_2CO_3)$.When the $pH$ of ra

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$5.6$

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(D) Normal rain water has a $pH$ of about $5.6$ due to the presence of dissolved $CO_2$ which forms weak carbonic acid $(H_2CO_3)$.When the $pH$ of rain water drops below $5.6$,it is termed as acid rain.This is primarily caused by the presence of sulfur oxides $(SO_x)$ and nitrogen oxides $(NO_x)$ in the atmosphere,which react with water to form sulfuric acid $(H_2SO_4)$ and nitric acid $(HNO_3)$.

List-$I$	List-$II$
$(a)$ Carbon monoxide	$(i)$ Carcinogenic
$(b)$ Sulphur dioxide	$(ii)$ Metabolized by pyrus plants
$(c)$ Polychlorinated biphenyls	$(iii)$ Haemoglobin
$(d)$ Oxides of nitrogen	$(iv)$ Stiffness of flower buds

Rain water is considered as acid rain if its $pH$ is less than.......

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