A = \(\frac{pV^{2} T^{2}}{n}\) 

The SI unit for the quantity A is -

1. \(N   m^{2}   K^{2}   mol^{- 1}\)

2. \(N   m^{4}   K   mol^{- 1}\)

3. \(N   m^{2}   K^{3}   mol^{- 1}\) 

4. \(N   m^{4}   K^{2} mol^{- 1}\)

A mixture of dihydrogen and dioxygen at one bar pressure contains 20% by weight of dihydrogen. The partial pressure of dihydrogen is -

1. 0.2 bar

2. 0.7 bar

3. 0.8 bar

4. 0.6 bar