When the concentration of a reactant, $A$, in a reaction : $A \to$ Products is doubled, the  rate of reaction increases seven times, the order of the reaction is between -

The rate law for reaction $A + 2B = C + 2D$ will be

The rates of a certain reaction $(dc/dt)$ at different times are as follows

Time                                 Rate (mole $litre^{-1}\,sec^{ -1}$ )

$0$                                        $2.8 \times {10^{ - 2}}$

$10$                                      $2.78 \times {10^{ - 2}}$

$20 $                                     $2.81 \times {10^{ - 2}}$

$30$                                       $2.79 \times {10^{ - 2}}$

The reaction is

The one which is unimolecular reaction is

In a reaction if the concentration of reactant A is tripled, the rate of reaction becomes twenty seven times. What is the order of the reaction ?

Half-life period of a first order reaction is $1386$ seconds. The specific rate constant of the reaction is