For a zero order reaction $\mathrm{A} \longrightarrow$ product. Conc. of $A$ decreases from $0.8 \mathrm{~mol} \mathrm{~dm}^{-3}$ to $0.2 \mathrm{~mol} \mathrm{~dm}^{-3}$ in 6 minute. What is rate constant of the reaction?

What is rate constant of a first order reaction if $60 \%$ reactant decompose in 45 minute?

Half life of a zero order reaction is directly proportional to ___________

What time is required for 100 g of reactant to reduce to 25 g in a first order reaction having half life 5760 year?