Identify the correct statements from the following a) BOD value of clean water is less than $5 \mathrm{ppm}$…
Identify the correct statements from the following
a) BOD value of clean water is less than $5 \mathrm{ppm}$
b) Oxidation of ethene in the presence of $\mathrm{Pd}^{2+}$ catalyst in aqueous medium gives acetic acid
c) Photochemical smog causes damage to plant life
d) Reducing smog is a mixture of smoke, fog and $\mathrm{SO}_2$