Give that the equilibrium constant for the reaction,

2SO₂ (g) + O₂ (g)  ⇌ 2SO₃ (g)

has a value of 278 at a particular temperature. What is the value of the equilibrium constant for the following reaction t the same temperature?

SO₃ (g)  ⇌ SO₂ (g) +1/2 O₂ (g)

• 1.8 x 10^-3

• 3.6 x 10^-3

• 6.0 x 10^-2

• 1.3 x 10^-5

Given the reaction between two gases represented by A₂ and B₂ to give the compound AB (g).
A₂(g) +B₂ (g)  ⇌ 2AB (g)
At equilibrium the concentration
of A₂ = 3.0 x 10^-3 M
of B₂ = 4.2 x 10^-3 M
of AB = 2.8 x 10^-3 M

If the reaction takes place in a sealed vessel at 527^oC, then the value of K_c will be

• 2.0

• 1.9

• 0.62

• 4.5

During the change of O₂ to O₂^- ion, the electron adds on which one of the following orbitals?

• π* orbital

• π orbital

• σ* orbital

• σ orbital

A  certain gas takes three times as long to effuse out as helium. Its molecular mass will be 

• 27 u

• 36 u 

• 64 u

• 9 u

The orbital angular momentum of p-electron is given as

• 
• 
• 
• 

A.

Orbital angular momentum =