Hydrogen bond is maximum in

The value of PV for 5.6 litres of an ideal gas is ________ RT, at NTP.

A spherical balloon of 21 cm diameter is to be filled up with hydrogen at N.T.P from a cylinder containing the gas at 20 atmospheres at 27^oC. If the cylinder can hold 2.82 litres of water, calculate the number of balloons that can be filled up.

Sodium when burnt in excess of oxygen gives sodium oxide.