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    				| 1. | What isacid rain ? | 
| Answer» SOLUTION :(i) IFtheatmosphericairis pollutedwith oxidegasesof sulphur and nitrogen theygetdissolvedin therainWaterand makeitspHless than 7. (II )thusif thepHofrainwateris lessthan 7.thenit iscalledacidrain? (iii )whenacidrainflows intothe rivers itlowersthe PHOF theriverwateralso . (iv) Thesurvival of aquaticlifeinsuchrivers becomesdifficult. | |