Data Given: Molarity = 0.085 M
Ka = 4.5 × 10⁻⁴
To Find: pH = ?
Solution: First find out the concentration of [H⁺] Ions using following formula,
[H⁺] = 
Puting values,
[H⁺] =

[H⁺] =

[H⁺] = <span>0.00618465843
</span>Or,
[H⁺] = 6.18 × 10⁻³Calculate pH as,
pH = -log [H⁺]
pH = -log (6.18 × 10⁻³)
pH = 2.20
A bimolecular reaction can be kinetically first order in behaviour provided one of the reactants is taken in such a large excess that its concentration may hardly change. Such a reactant will not contribute to the order. Thus, a bimolecular reaction will be of first order. These reactions are known as pseudo chemical reactions.
The answer is false because its a physical change