2.5 mL 0.4 M weak monoacidic base (K_b = 1 $$\times$$ 10^$$-$$12 at 25$$^\circ$$C) is titrated with 2/15 M HCl in water at 25$$^\circ$$C. The concentration of H⁺ at equivalence point is (K_w = 1 $$\times$$ 10^$$-$$14, at 25$$^\circ$$C)

For a reaction 2A + B $$ \to $$ P, when concentration of B alone is doubled, t_1/2 does not change and when concentrations of both A and B is doubled, rate increases by a factor of 4. The unit of rate constant is,

Consider the following two first order reactions occurring at 298 K with same initial concentration of A :

(1) A $$\to$$ B; rate constant, k = 0.693 min^$$-$$1

(2) A $$\to$$ C; half-life, t_1/2 = 0.693 min

Choose the correct option.

The kinetic study of a reaction like vA $$\to$$ P at 300 K provides the following curve, where concentration is taken in mol dm^$$-$$3 and time in min.


Identify the correct order (n) and rate constant (k)