For a given chemical reaction

$$\gamma$$₁A + $$\gamma$$₂B $$\to$$ $$\gamma$$₃C + $$\gamma$$₄D

Concentration of C changes from 10 mmol dm^$$-$$3 to 20 mmol dm^$$-$$3 in 10 seconds. Rate of appearance of D is 1.5 times the rate of disappearance of B which is twice the rate of disappearance A. The rate of appearance of D has been experimentally determined to be 9 mmol dm^$$-$$3 s^$$-$$1. Therefore, the rate of reaction is _____________ mmol dm^$$-$$3 s^$$-$$1. (Nearest Integer)

The rate constants for decomposition of acetaldehyde have been measured over the temperature range 700 - 1000 K. The data has been analysed by plotting ln k vs $${{{{10}^3}} \over T}$$ graph. The value of activation energy for the reaction is ___________ kJ mol^$$-$$1. (Nearest integer)

(Given : R = 8.31 J K^$$-$$1 mol^$$-$$1)

For the reaction A $$\to$$ B, the rate constant k(in s^$$-$$1) is given by

$${\log _{10}}k = 20.35 - {{(2.47 \times {{10}^3})} \over T}$$

The energy of activation in kJ mol^$$-$$1 is ____________. (Nearest integer) [Given : R = 8.314 J K^$$-$$1 mol^$$-$$1]

For a first order reaction, the ratio of the time for 75% completion of a reaction to the time for 50% completion is ____________. (Integer answer)