Question

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 atm at 27°C. If the cylinder can hold 2.82 litre of water, the number of balloon/s that can be filled up are: 

(A) 5 

(B) 10 

(C) 20 

(D) None of these

Answer 1

Correct Option (B) 10

Explanation:

 For a balloon,