Kw at 90C is \\\\(10^{-12}\\\\)Hence, Neutral point is 6So, on adding \\\\(pH = 2 (10^{-2} H^{+})\\\\) and \\\\(pH = 10 (10^{-2} OH)\\\\)Solution lead to the formation of neutral solution i.e.\\\\( pH = 6\\\\)