213) What is the approximate OH⁻ ion concentration of a 0.15M NH₃ solution? (K_a = 1.75 x 10⁻⁵)

214) The vapour density of PCl₅ is 104.25 but when heated to 230^oC, its vapour density at this temperature will be:

215) When ammonia is added to pure water, the concentration of which of the following species already present, will decrease?

216) The equilibrium constant K_p for a homogeneous gaseous reaction is 10⁻⁸. The standard Gibb′s free energy change, ΔG^o for the reaction is:

217) If pH of a saturated solution of Ba(OH)₂ is 12, the value of K_sp is: