Question

We  feel  fresh  while  on  a  morning  walk  in
natural  surroundings  .  Why  don’t  we  feel  the
same  after  10  a.m  and  during  rush  hours  ?
Write  a  chemical  reaction  to  support  your
statement.


MSCERT Class 10 General Science Ch2 The Magic of Chemical Reactions

Answer 1

On early in the morning we find quite less no.of vehicles around us, Such that the percentage of Carbon monoxide or dioxide or polluted air around us is less which doesnt cause any irritation. this phenomenon is viceversa during busy hours. So, We feel fresh while on a morning walk in natural surroundings which we cant find after 10 am.
 
CO + hb (haemoglobin) --------> COhb

Answer 2

Actually in this case in the early morning as there are less people who have woken up so there is less traffic which means there will be less vehicular traffic and moreover we feel fresh when we inhale less polluted air.
But,if we see the condition after 10 a.m. many people are now have to go to work or they mucst have some household works so they out by vehicles which means by burning of fuels(which contains sulphur) there will be air pollution and the air will be polluted which makes us tired and we don't feel same as it was in early morning.
A chemical reaction is S + O₂→ SO₂↑