The concentration of bod u in a river entering the first of two
lakes connected in series is equal to 20 g/m 3 . if the first-order
bod rate coefficient k is 0.35 d -1 and each lake behaves as a
complete-mix reactor, determine the bod u concentration in the
outlet of each lake. the steady-state river flow rate is 4,000 m 3
/d, and the lake volumes are 20,000 and 12,000 m 3 ,
respectively.

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na

Green is technically every other color but green but the other wavelengths of the other colors get absorbed by the object and the wavelength of the color green gets reflected

The answers are 3.c kelvin4.b liquids only

Ibelieve the answer is d. bleachhope my answer has you : )