List of top Physics Questions on Decay Rate asked in MET

The reaction involved in the oil of winter green test is salicylic acid + missing reagent $\xrightarrow{\Delta, \text{Conc. H}_{2}\text{SO}_{4}}$ product. The missing reagent in the above reaction is

A covalent molecule $AB_{3}$ has pyramidal structure. The number of lone pair and bond pair of electrons in the molecule are respectively

A radioactive substance has a half-life of 60 min. During 3 hours, the fraction of the substance that has decayed is:

The half-life of a radioactive element is 10 days. The time required for 75% of the element to decay is: