The BOD values for pure water and highly polluted water are respectively
The BOD values for pure water and highly polluted water are respectively
$\gt 5 \mathrm{ppm}, \leq 17 \mathrm{ppm}$
$\gt 5 \mathrm{ppm}, \geq 17 \mathrm{ppm}$
$\lt 5 \mathrm{ppm}, \geq 17 \mathrm{ppm}$
$\lt 5 \mathrm{ppm}, \leq 17 \mathrm{ppm}$
Solution
BOD (Biological oxygen demand) is less than 5ppm in clean water, where as highly polluted water have a BOD value of 17 ppm and more.
$< 5 \mathrm{ppm} \geq 17 \mathrm{ppm}$