Two balloon are filled with equal moles of hydrogen and helium. Which balloon will contract first if holes of same size are made in them?

A helium filled balloon will float in air because

The primary reason balloons are filled with helium instead of hydrogen is

A balloon is filled with hydrogen. For sound waves, this balloon behaves like

A rubber balloon filled with hydrogen gas is left free in air. Then the balloon

Two balloons of equal weight and volume are filled with hydrogen gas. One of the balloons is made of rubber while the other is made of incompressible polythene. If hydrogen gas does not leak from either balloon, then which balloon will rise higher?

A balloon is filled with one mole of helium at 0^@C and 1 bar pressure. It will burst if pressure is decreased to 0.2 bar. What is the maximum volume of balloon?

When a balloon filled with air released so that the air escapes, the balloon shoots off into the air. Explain would the same happen if the balloon were released in a vacuum?