For reaction products, the active mass of B is kept constant and that of A is doubled. The rate of reaction wills then ____.
Increase 2 times
Increase 4 times
Decrease 2 times
Decrease 4 times
For the reaction
if the value of would be ____.
The rate of a chemical reaction depends upon ____.
Time
Pressure
Concentration
All of the above
When the concentration of A in the reaction is doubled, the rate of reaction is ____.
Doubled
Decreased by half
Unchanged
Increased by four times
The rate of a reaction is doubled for every rise in temperature. The increase in reaction rate as a result of temperature rise from to is ____.
112
512
400
614
A catalyst increases the rate of a chemical reaction by ____.
Increasing the activation energy
Decreasing the activation energy
Reacting with reactants
Reacting with products
The main function of a catalyst in speeding up a reaction is ____.
To increase the rate of the forward reaction
To change the reaction path so as to decrease the energy of activation for the reaction
To reduce the temperature at which the reaction can occur
To increase the energy of the molecules of the reactants
Which of the following statements is false in relation to enzyme?
pH affects their functioning
Temperature affects their functioning
They always increase activation energy
Their reactions are specific
A reaction is catalysed by ‘X ’. Here ‘X’ ____.
Decreases the rate constant of reaction
Does not affect the equilibrium constant of reaction
Decreases the enthalpy of reaction
Decreases the activation energy
Which reaction characteristics are changing by the addition of a catalyst to a reaction at constant temperature :
(i) Activation energy (ii) Equilibrium constant
(iii) Reaction entropy (iv)Reaction enthalpy
(i) Only
(iii) only
(i) and I(ii) only
All of the above