Decompsition of `H_(2)O_(2)` follows a frist order reactions. In 50 min the concentrations of `H_(2)O_(2)` decreases from 0.5 to 0.125 M in one such decomposition . When the concentration of `H_(2)O_(2)` reaches 0.05 M, the rate of fromation of `O_(2)` will be

Options

A. `6.93xx10^(-2) M min ^(-1)`
B. `6.93 xx10^(-4) M min ^(-1)`
C. `2.66 L min ^(-1) at STP`
D. `1.34xx10^(-2) M min ^(-1)`

Answer

B