In Homogeneous gaseous equilibrium, M(g) + 3N(g)--> 4P(g). Initial concentration of M is equal to that of N. If equilibrium concentrations of M and P are equal then what will be the value of KC?

A certain Zero order reaction has rate constant K is 0.025 MS^-1 for disappearance of A . What will be the concentration of A after 15 sec if initial concentration is A is 0.5M.

(A) 2.5 M  (B) 0.5 M (C) 1.5 M  (D) 0.125 M