Related InterviewSolutions

• When the initial concentration of the reactant is doubled, the half-life period of the reaction is also doubled. Hence the order of the reaction is :(a) one (b) two (c) fraction (d) zero
• The rate of the first order reaction A → products is 0.01 M/s, when reactant concentration is 0.2 M. The rate constant for the reaction will be :(a) 0.05 s-1(b) 0.05 min-1 (c) 0.1 s-1 (d) 0.01 s-1
• The rate constant of a first order reaction is given by :(a) k = 2.303 \(\times\) t \(\times\) \(log_{10}\frac{a}{(a-x)}\) (b) \(\frac{k}{t}\) = 2.303 \(log_{10}\frac{a}{(a-x)}\) (c) k = \(\frac{2.303}{t}\)\(log_{10}\frac{1}{(a-x)}\) (d) k = \(\frac{2.303}{t}\)\(log_{10}\frac{a}{(a-x)}\) 
• The order of nuclear disintegration reaction is : (a) zero (b) one (c) two (d) fraction
• The unit of rate constant for zero order reaction is :(a) mol L-2 s-1 (b) mol-1 Ls-1 (c) mol2L-2s-1 (d) mol L-1s-1
• On increasing temperature, activation energy of a reaction decreases, why ?
• Which of the following statements is incorrect about the collison theory of chemical reaction?(i) It considers reacting molecules or atoms to be hard spheres and ignores their structural features.(ii) Number of effective collisions determines the rate of reaction.(iii) Collision of atoms or molecules possessing sufficient threshold energy results into the product formation.(iv) Molecules should collide with sufficient threshold energy and proper orientation for the collision to be effective.
• A reaction is of first order in reactant A and of second order in reactant B. How is the rate of this reaction affected when (i) the concentration of B alone is increased to three times (ii) the concentrations of A as well as B are doubled?
• Note: In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.(i) Both assertion and reason are correct and the reason is correct explanation of assertion.(ii) Both assertion and reason are correct but reason does not explain assertion.(iii) Assertion is correct but reason is incorrect.(iv) Both assertion and reason are incorrect.(v) Assertion is incorrect but reason is correct.Assertion : The enthalpy of reaction remains constant in the presence of a catalyst. Reason : A catalyst participating in the reaction, forms different activated complex and lowers down the activation energy but the difference in energy of reactant and product remains the same.
• In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices. (i) Both assertion and reason are correct and the reason is correct explanation of assertion. (ii) Both assertion and reason are correct but reason does not explain assertion. (iii) Assertion is correct but reason is incorrect. (iv) Both assertion and reason are incorrect. (v) Assertion is incorrect but reason is correct.Assertion: The enthalpy of reaction remains constant in the presence of a catalyst.Reason: A catalyst participating in the reaction, forms different activated complex and lowers down the activation energy but the difference in energy of reactant and product remains the same.