Q.1. Which of the following is incorrect about the order of a reaction ?
(A) It is Calculated Experimentally
(B) It is Sum of Powers of Powers
(C) The Order of reaction cannot be fractional
(D) There is not necessairaly a connection between order and stoichiometry of a reaction
Ans:- (C)
Q.2. A catalyst is a substance which
(A) Increase the equilibrium concentration of the product
(B) changes the equilibrium constant of reaction
(C) Shortness the time of reach equilibrium
(D) Supplies energy to the reaction
Ans:- (C)
Q.3. Which of the following is not a surface phenomenon ?
(A) Heterogeneous catalysis
(B) Fusion of solids
(C) Corrosion
(D) Electrolysis process
Ans:- (D)
Q.4. The rate constant of a reaction depends upon
(a) temperature of the reaction
(b) extent of the reaction
(c) initial concentration of the reaction
(d) the time of completion of reaction
Ans:- (C)
Q.5. Rate constant in case of first order reaction is
(a) inversely proportional to the concentration units
(b) independent of concentration units
(c) directly proportional to concentration units
(d) inversely proportional to the square of concentration units
Ans:- (B)
Q.6. The rate constant for the reaction, 2N2O2→ 4NO2 + O2 is 2 x 10–5s-1. If rate of reaction is 1.4 x 10-5 mol L-1 s-1, what will be the concentration of N2O5 in mol L-1?
(a) 8
(b) 0.7
(c) 1.2
(d) 1
Ans:- (B)
Q.7. The order of reaction is decided by…………..
(a) temperature
(b) mechanism of reaction as well as relative concentration of reactants
(c) molecularity
(d) pressure
Ans:- (B)
Q.8. Which of the following is an example of a fraction order reaction ?
(a) NH4NO2 → N2 +2H2O
(b) NO + O3 → NO2+O2
(c) 2NO + Br2 → 2NOBr
(d) CH3CHO → CH4 + CO
Ans:- (D)
Q.9. What will be the rate equation for the reaction 2X + Y→ Z, if the order of the reaction is zero ?
(a) Rate = k[X] [Y]
(b) Rate = k
(c) Rate = A[X]0[Y]
(d) Rate = k[X][Y]0
Ans:- (B)
Q.10. The unit of rate constant for the reaction, 2H2+ 2NO → 2H2O + N2which has rate – k[H2][NO]2, is …………..
(a) molL–1s-1
(b) s-1
(c) mol–1L2s-1
(d) mol L-1
Ans:- (C)
Q.11. The unit of rate and rate constant are same for a…………….
(a) zero order reaction
(b) first order reaction
(c) second order reaction
(d) third order reaction
Ans:- (A)
Q.12. The number of molecules of the reactants taking part in a single step of the reaction is indicative of
(a) order of a reaction
(b) molecularity of a reaction
(c) fast step of the mechanism of a reaction
(d) half-life of the reaction
Ans:- (B)
Q.13. The overall rate of a reaction is governed by
(a) the rate of fastest intermediate step
(b) the sum of the rates of all intermediate steps
(c) the average of the rates of all the intermediate steps
(d) the rate of slowest intermediate step.
Ans:-(D)
Q.14. Radioactive disintegration is an example of ……………
(a) zero order reaction
(b) first order reaction
(c) second order reaction
(d) third order reaction
Ans:- (B)
Q.15. A first order reaction has a rate constant 1.15 x 10-3s-1. How long will 5 g of this reaction take to reduce to 3 g ?
(a) 444 s
(b) 400 s
(c) 528 s
(d) 669 s
Ans:- (A)
Q.16. Half-life period of a first order reaction is 10 min. What percentage of the reaction will be completed in 100 min ?
(a) 25%
(b) 50%
(c) 99.9%
(d) 75%
Ans:- (C)
Q.17. The rate constant for a first order reaction is 2 x 10-2min-1. The half-life period of reaction is
(a) 69.3 min
(b) 34.65 min
(c) 17.37 min
(d) 3.46 min
Ans:- (B)
Q.18. The value of rate of a pseudo first order reaction depends upon
(a) the concentration of both the reactants present in the reaction
(b) the concentration of the reactant present in small amount
(c) the concentration of the reactant present in excess
(d) the value of ΔH of the reaction
Ans:- (B)
Q.19. Under what conditions a bi-molecular reaction may be kinetically of first order ?
(a) When both reactants have same concentration
(b) When one of the reacting species is in large excess
(c) When the reaction is at equilibrium
(d) When the activation energy of reaction is less
Ans:- (B)
Q.20. For an endothermic reaction, AH represents the enthalpy of the reaction in kj mol-1. The minimum amount of activation energy will be
(a) less than zero
(b) equal to ΔH
(c) less than ΔH
(d) more than ΔH
Ans:- (D)
Q.21. The decomposition of a hydrocarbon follows the equation k = (4.5 x 1011 s-1) e-28000K/T. What will be the value of activation energy ?
(a) 669 kJ mol-1
(b) 232.79 kJ mol-1
(c) 4.5 x 10-1 kJ mol-1
(d) 28000 kJ mol-1
Ans:- (B)
Q.22. The rate constant is given by the equation k = P.Ze-Ea/RT Which factor should register a decrease for the reaction to proceed more rapidly ?
(a) T
(b) Z
(c) E
(d) P
Ans:- (C)
Q.23. Threshold energy is equal to ……………
(a) activation energy
(b) activation energy – energy of molecules
(c) activation energy + energy of molecules
(d) None of these
Ans:- (C)
Q.24. The role of a catalyst is to change………………..
(a) Gibbs energy of reaction
(b) enthalpy of reaction
(c) activation energy of reaction
(d) equilibrium constant
Ans:- (C)
Q.25. In the presence of a catalyst, the heat evolved or absorbed during the reaction…………..
(a) increases
(b) decreases
(c) remains unchanged
(d) may increase or decrease
Ans:- (C)
Q.26. A first order reaction is 50% completed in 1.26 x 1014How much time would it take for 100% completion ?
(a) 1.26 x 1015 s
(b) 2.52 x 1014 s
(c) 2.52 x 1028 s
(d) Infinite
Ans:- (D)
Q.27. The half life period of first order reaction is 1386 seconds. The specific rate constant of the reaction is
(a) 0.5 × 10-2 s-1
(b) 0.5 × 10-3 s-1
(c) 5.0 × 10-2 s-1
(d) 5.0 × 10-3 s-1
Ans:- (B)
Q.28. The rate constant of a reaction A → B is 0.6 × 103 mole per second. If the concentration of [A] is 5 M, then what will be concentration of [B] after 20 months?
(a) 0.36 M
(b) 0.72 M
(c) 1.08 M
(d) 3.60 M
Ans:- (B)
Q.29. Which of the following is affected by catalyst?
(a) ∆H
(b) ∆S
(c) ∆G
(d) Ea
Ans:- (D)
Q.30. A first order reaction has specific reaction rate 10-2s-1. How much time it will take for 20g of reactant to reduce to 5g?
(a) 138.6 s
(b) 346.5 s
(c) 693.0 s
(d) 238.6 s
Ans:- (A)
Q.31. For a chemical reaction A→B, it is found that the rate of reaction doubles when the concentration of A is increased four times. The order of reaction is
(a) Two
(b) One
(c) Half
(d) Zero
Ans:- (C)
Q.32. The half life of the first order reaction having rate constant K = 1.7 x 10-5s-1is
(a) 12.1 h
(b) 9.7 h
(c) 11.3 h
(d) 1.8 h
Ans:- (C)
Q.33. The rate constant of a reaction depends upon :
(a) temperature of the reaction
(b) extent of the reaction
(c) initial concentration of the reactants
(d) the time of completion of reaction
Ans:- (D)
Q.34. The unit of rate and rate constant are same for a :
(a) zero order reaction
(b) first order reaction
(c) second order reaction
(d) third order reaction
Ans:- (A)
Q.35. For a unimolecular reaction :
(a) the order and molecularity of the slowest step are equal to one
(b) molecularity of the reaction can be zero, one or two
(c) more than one reacting species are involved in one step
(d) molecularity of the reaction can be determined only experimentally
Ans:- (A)
Q.36. The overall rate of a reaction is governed by
(a) the rate of fastest intermediate step
(b) the sum total of the rates of all intermediate steps.
(c) the average of the rates of all the intermediate steps
(d) the rate of slowest intermediate step
Ans:- (D)