Rate constant of a reaction (k) is 175 litre² mol^-2 sec^-1. What is the order of reaction?

75% of the first order reaction was completed in 32 min. 50% of the reaction was completed in

The half-life period of a radioactive element is 20 days. What will be the remaining mass of 100 g of it after 60 days?

For a complex reaction ............. .

Which of the following statements are in accordance with the Arhenius equation ?

With the help of diagram explain the role of activated complex in a reaction.

Why are reactions of higher order less in number ?

For a reaction, the graph of the rate reaction against molar concentration of the reactant is as shown. What is the order of the reaction ?

Why molecularity is applicable only for elementary reactions and order is applicable for elementary as well as complex reactions?

A first order reaction takes 100 minutes for completion of 60% of the reaction.  Find the time when 90% of the reaction will be completed.

In general it is observed that the rate of chemical reaction doubles with every 10^o rise in temperature.  If the generalization holds good for the reaction in the temperature range 295 K to 305 K, what would be the value of activation energy for the this reaction?
(R = 8.314 J mol^-1  K^-1)

At 300 ^oC the thermal dissociation of HI is found to be 20%.  What will be the equilibrium concentrations of H₂ and I₂ in the system
H₂ + I₂ \(\rightleftharpoons \) 2HI at this temperature if the equilibrium concentration of HI in it be 0.96 mol L^-1?

For the reaction, the energy of activation is 75KJ / mol. When a catalyst is added the reaction its energy of activation is lowered to 20KJ / mol. What is the effect of catalyst on the rate of reaction at 20⁰C.

(a) Explain the following terms:
(i) Rate of a reaction
(ii) Activation energy of a reaction
(b) The decomposition of phosphine (PH₃) proceeds according to the following equation:
4PH₃(g) \(\to\)P₄ (g) + 6H₂ (g)
It is found that the reaction follows the following rate equation:
Rate = k [PH₃]
The half-life of PH₃ is 37.9 s at 120 ^oC.
(i) How much time is required for 3/4^th of PH₃ to decompose?
(ii) What fraction of the original sample of PH₃ remains behind after 1 minutes?

For the hydrolysis of methyl acetate in aqueous solution, the following results were obtained:

(i) Show that It follows pseudo first order reaction, as the concentration of water remains constant.
(ii) Calculate the average rate of reaction between the time interval 30 to 60 seconds. [Given log 2 = 0.3010, log 4 = 0.6021]

In a given graph, if ‘E’ is the activation energy for a given reaction, explain how temperature influences the rate of reaction.

The time required for 10% completion of a first order reaction at 298 K is equal to that required for its 25% completion at 318 K. If the pre-exponential factor for the reaction is 3.56 \(\times 10 ^{9} s^{-1}\), calculate its rate constant at 318 K and also the energy of activation.