For which of the following reactions, $$\Delta $$H is equal to $$\Delta $$U?

Ejection of the photoelectron from metal in the photoelectric experiment can be stopped by applying 0.5 V when the radiation of 250 nm is used. The work function of the metal is :

N₂O₅ decomposes to NO₂ and O₂ and follows first order kinetics. After 50 minutes, the pressure inside the vessel increases from 50 mmHg to 87.5 mmHg. The pressure of the gaseous mixture after 100 minute at constant temperature will be :

In which of the following reactions, an increase in the volume of the container will favour the formation of products?