The time for half life period of a certain reaction $A \to$ products is 1 hour. When the initial concentration of the reactant ‘A’, is $2.0\; mol\; L^{–1},$ how much time does it take for its concentration to come from $0.50\; to 0.25\; mol\; L^{–1}$ if it is a zero order reaction ?

Question

( A ) 4 h
( B ) 0.5 h
( C ) 1 h
( D ) 0.25 h