8. One of followings is NOT Inorganic pollutant: a. Phenois (bHeavy metals C. cyanide d. Sulfides

1. Water is frequently disinfected with chlorine gas, forming hypochlorous acid (HOCI), which partially ionizes to hypochlorite (OCI) and hydrogen ions as follows: HOCI H+ + OCI- The concentration of HOCI, which is the desired disinfectant, depends on the water pH. a) Write the equations to express the two ionization fractions for HOCI, that is, ao and ai. b) Plot ionization fractions vs pH, clearly identifying a regions and pKa, at 25 °C. c) Plot speciation of HOCI vs pH (log[OCI] vs pH) for a Croci-= 0.05, clearly identifying regions and pKa, at 25 °C.

With the increased use of chloramines (e.g., NH2CI) as a residual disinfectant in water supply, ammonia concentrations in drinking water have increased. Nitrifying microorganisms use ammonia (NH4) as an electron donor (oxidized to NO) and oxygen (Oz) as an electron acceptor (reduced to H2O) in a process known as nitrification. The microorganisms use inorganic carbon (dissolved COz and HCO3) as their carbon sources. These microorganisms can be classified as ( )? A. photoautotroph B. chemoautotroph C. chemoheterotroph

Which of the following statement is incorrect for the effect of SO2 on the environment? a. Sulfur dioxide can result in particulate matters (PMs) formation b. Sulfur dioxide is a greenhouse gas c. Sulfur dioxide can cause acid rain which seriously affects ecosystems d. Sulfur dioxide can negatively impact air quality

Charcoal samples from Stonehenge in England wereburned in O2, and the resultant CO2 gas bubbled into asolution of Ca(OH)2 (limewater), resulting in the precipitationof CaCO3. The CaCO3 was removed by filtration anddried. A 788-mg sample of the CaCO3 had a radioactivityof 1.5x 10-2 Bq due to carbon-14. By comparison, livingorganisms undergo 15.3 disintegrations per minute pergram of carbon. Using the half-life of carbon-14, 5700 yr,calculate the age of the charcoal sample.

Explain the Main components of the vibroflot.