(a) Predict and explain whether the following reaction is spontaneous or not: The standard entropy (S) (J K.mol) values at 27C is given below. (1) Ag + 3Bg 4Cm (A: S'= 132: B. S = 202: C: S=71.1) {i:) 2D +3E. 3F1) (D: S = 126: E S= 195: F. S=68.1) (b) Explain the phenomenon, property and bandgap change occurring when Si is doped with the following elements Doped with Phosphorus (P) and Boron (B)