See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

(A) Highly pure dilute solution of sodium in liquid ammonia is blue and not red. (B)    o 3 2 2 2 800 C 4NaNO s 2Na O 2N g 5O g     (C)     2 2 2 2 Na O Na O NaO excess traces    (D) (i)   3 3 2 4 H BO H O B OH H       …(i) OH OH O H B OH O H OH ii  O B OH OH O So, in accordance with Le Chatlier’s principle, Eq. (i) shifts in forward direction due to reaction (ii) and hence pH decreases.