What is the oxidation number of phosphorus in kh. po? [2] (34) reactions which cannot occur spontaneously are [1] [2] [3] [4] [5] exothermic endothermic all reactions can occur spontaneously no reactions can occur spontaneously both [1] and [2] (35) from your knowledge of solubility guidelines, which of the following compounds is soluble in water? [1] [2] [3] [4] [5] sodium phosphate calcium sulphide magnesium hydroxide silver chloride barium sulfate