t_1/4 can be taken as the time taken for the concentration of a reactant to drop to $$3 \over 4$$ of its initial value. If the rate constant for a first order reaction is K, the t_1/4 can be written as

During the process of electrolytic refining of copper, some metals present as impurity settle as ‘anode mud’ These are

The correct order of the thermal stability of hydrogen halides (H – X) is :

The number of hydrogen atom(s) attached to phosphorus atom in hypophosphorous acid is :