Statement - I : Helium is preferred than hydrogen in filling ballons for meterological observations
Statement - II : Helium is lighter than hydrogen and it is non-combustible in nature

Helium is preferred over hydrogen for filling balloons used in meteorological observations because of its non-flammability and non-reactivity. Hydrogen is also commonly used for these purposes because it is readily available and less expensive than helium, but it is highly flammable and can pose a significant safety risk if not handled properly.

In addition to being non-flammable, helium is also chemically inert, meaning it is less likely to react with other elements or compounds in the atmosphere. This makes it ideal for scientific measurements and experiments that require a stable environment.

Furthermore, helium is a lighter gas than hydrogen, which means it provides a better lift for balloons with the same volume. This allows meteorologists to launch larger and heavier instruments into the atmosphere for data collection.

Overall, while hydrogen is a viable option for balloon filling, helium is the preferred choice for meteorological observations due to its safety, stability, and lifting capacity.