The concentration of the dissolved oxygen in water depends on several factors like temperature, pressure, salinity and atmospheric condition. The capacity to hold the dissolved oxygen is higher in cold water, this is because of solubility of gases. The concentration of DO in the cold water reaches upto 10 ppm.
So, the correct answer is (A): 10 ppm
20 mL of sodium iodide solution gave 4.74 g silver iodide when treated with excess of silver nitrate solution. The molarity of the sodium iodide solution is _____ M. (Nearest Integer value) (Given : Na = 23, I = 127, Ag = 108, N = 14, O = 16 g mol$^{-1}$)
The following are the major sources of Water Pollution: