True or False $(20$ pts$)$

$(1)$ Chlorine demand is the difference between total chlorine and free chlorine.

$(2)$ In raw wastewater samples, most of nitrogen is in the form of nitrate.

$(3)$ If $10m\frac{g}{L}$ of $N{H}_3-N$ is converted to nitrate, the nitrate concentration is $10m\frac{g}{L}$ as N $.$

$(4)$ Free chlorine consists of hypochlorous acid and hypochlorite.

$(5)$ Chloramines is a weaker disinfectant than free chlorine.

$(6)N{a}_{2}HP{O}_4$ contributes to the orthophosphates.

$(7)$ For phosphorus analysis, the purpose of the autoclave is to kill the phosphorus bacteria which interferes colorimetric analysis.

$(8)$ Chloride is an effective disinfectant for water and wastewater treatment.

$(9)$ "Crown" corrosion is caused by the corrosive action of $H_{2}S{O}_4.$

$(10)$ Breakpoint chlorination can be used for removal of ammonia.