A balloon contains 25 g of helium gas. If 5 grams of helium gas is released from this balloon then the balloon will have a smaller volume.?

Correct.

For a gas :
P : pressure
V : volume
n : number of moles
R : gas constant (constant)
T : temperature
m : mass
M : molar mass (constant)


Gas law :
PV = nRT
PV = (m/M)RT
V = (RT/PM) m

Under constant T and P :
V = constant × m
Therefore, the volume (V) is directly proportional to the mass (m) of the gas.

Hence, if some helium is released, the balloon will have a smaller volume.

Correct

Ok.

Yes. Gas pressure increases Volume. It depends on the texture of ballon and the mols (quantity of gas) of the element of gas.