When the gases Sulphur dioxide and hydrogen sulphide mix in the presence of water the reaction is s02 + 2H2S 2H2O + 35 Here
hydrogen sulphide is acting as :-

the answer is the first option

explanation:

just googled it m8. not that hard

lol

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.

it means there are 3 atoms of oxygen

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error