Which one of the following species is diamagnetic in nature?

• He₂⁺

• H₂

• H₂⁺

• H₂^-

For a spontaneous reaction the ∆G, equilibrium constant (K) and E^o_cell will be respectively 

• -ve, >1, +ve

• +ve, >1, -ve

• -ve, <1, -ve

• -ve, >1, -ve

Consider the reaction: N₂ +3H₂ → 2NH₃ carried out at constant temperature and pressure. If ∆H and ∆U are the enthalpy and internal energy changes for the reaction, which of the following expressions is true? 

• ∆H = 0

• ∆H = ∆U

• ∆H < ∆U

• ∆H >∆U

Which one of the following statements is NOT true about the effect of an increase in temperature on the distribution of molecular speeds in a gas?

• The most probable speed increases

• The fraction of the molecules with the most probable speed increases

• The distribution becomes broader

• The area under the distribution curve remains the same as under the lower temperature

The exothermic formation of ClF₃ is represented by the equation


Which of the following will increase the quantity of ClF₃ in an equilibrium mixture of Cl₂, F₂ and ClF₃?

• Increasing the temperature

• Removing Cl₂

• Increasing the volume of the container

• Adding F₂

D.

Adding F₂