A first order reaction takes 60 minutes for 75% completion. Determine its half- life.

A first order reaction takes 40 minutes for 20% completion. Calculate its half life period.

A first order reaction takes 40minutes for 20% decomposition. Calculate its half life period,

A first order reaction takes 40 minutes for 20% decomposition. Calculate its half life period.

A first order reaction takes 40 minutes for 30% decomposition. Calculate its half life.

A first order reaction takes 40 minutes for 30% decomposition. Calculate its half life period.

If a first order reaction takes 32 minutes for 75% completion, then time required for 50% completion is :