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a) NO₂ (Nitrogen dioxide).

b) By collision theory on increasing the temperature, the energy, as well as speed of molecules increases and the number of effective collisions, also increases. Due to these effective collisions, the molecules react and form product more easily. So, when we will increase the temperature then the molecules will react more easily and will attain equilibrium state more easily. So, increase in temperature influence the state of equilibrium.

c) The yield of the product NO₂ can be increased

(i) By increase the temperature- By collision theory On increasing the temperature, the energy as well as the speed of molecules increases and the number of effective collisions also increases. Due to these effective collisions, the molecules react and form product more easily. So when we increase the temperature then reactant molecules will react more easily and the formation of NO₂ will increase.

(ii) By increasing the concentration of N₂O₄- According to collision theory on increasing the concentration, the number of reactant molecules per unit volume increases and so the number of effective collisions also increases. And the reactant molecules react more easily. So on increasing the concentration, the reactant molecules will react more easily and the rate of reaction will increase.