# Factors Affecting Rate of Reaction

## Trending Questions

**Q.**When 20g of CaCo3 were put into 10 litre flask and heated to 800°C, 30% of CaCo3 remained unreacted at equilibrium K

_{p }for decomposition of CaCo3 will be -------

1)1.145atm 2)1.231 atm

2)2.146 atm 4)3.145 atm

**Q.**The rate of gaseous reaction is given by the expression k[A][B]. If the volume of the reaction vessel is suddenly reduced to 1/4th of the initial volume, the reaction rate relating to original rate will be:

- 1/10
- 1/8
- 8
- 16

**Q.**

The activation energy for the reaction

2HI_{(}_{g}_{)}
→
H_{2} +
I_{2(}_{g}_{)}

is
209.5 kJ mol^{−1}
at 581K. Calculate the fraction of molecules of reactants having
energy equal to or greater than activation energy?

**Q.**

Which of the following statements is incorrect for the order of reaction:

Order of reaction is not affected with the stoichiometric coefficients of the reactants.

Order of reaction is equal to the sum of the power of concentration terms in differential rate law.

Order of a reaction cannot be fractional.

Order of reaction can be determined experimentally.

**Q.**For first order homogeneous gaseous reaction A → 2B + C, the initial pressure was P0 while total pressure at time 't' was Pt. The expression for the rate constant k in terms of P0, Pt & t is:

- k=2.303tlog(2P03P0−Pt)
- k=2.303tlog(2P02Pt−Pt)
- k=2.303tlog(P0P0−Pt)
- None of these

**Q.**

If 0.5 moles of BaCl2 is mixed with 0.2 moles ofNa3PO4 the maximum number of moles ofBa3(PO4)2 that can be formed

**Q.**

In ionic equilibrium when dilution increases why degree of dissociation increases?

**Q.**

The rate of a reaction quadruples when the temperature changes from

293 K to 313 K. Calculate the energy of activation of the reaction assuming

that it does not change with temperature.

**Q.**

If α is the degree of dissociation of Na_{2}SO_{4}, the van't Hoff factor , i , used for calculating the molecular mass is

1 - Î±

1 - 2Î±

1 + Î±

1 + 2Î±

**Q.**For reaction,

aA+bB→Product

Rate of reaction =K[A]a[B]b.

If concentration of 'A' is doubled, rate is increased to four times. If concentration of B is made four times, rate is doubled. What is relation between rate of disappearance of A and that of B?

- −{d[A]dt}=−{d[B]dt}
- −{d[A]dt}=−{4d[B]dt}
- −{4d[A]dt}=−{d[B]dt}

- None of these

**Q.**

Calculate the n factor of Fe2O3 in the reaction

Fe2O3 ----: Fe + O2

**Q.**

Why does the rate of a reaction increase with rising in temperature?

**Q.**

If 9g of H_{2}O is electrolysed completely with 50% current efficiency, then how much O2 will be formed at STP?

**Q.**Decomposition of both A2(g) and B3(g) follows first order kinetics as:

A2(g) k1 −−→2A(g); k1 (per hr−1)=e14000(/J)RT+5B3(g) k2 −−→3B(g); k2 (per hr−1)=e20000(/J)RT+10

Where k1 and k2 are the rate constants with respect to disappearance of A2 and B3, respectively.

One mole of each of A2 (g) and B3 (g) are taken in a 100 L evacuated flask and at some temperature at which they start decomposing at the same rate. Select incorrect statement(s):

(Here A2 and B3 gases are nor reacting ideal gases)

- The temperature at which the rections are performed is 1200R
- At any instant, (PA2PB3) will be constant and equal to 1 where PA2= Partial pressure of A2 and PB3= Partial pressure of B3
- At some instant, the total pressure of all the gases may be less than 0.2 atm
- At any instant, (PAPB) will be constant and equal to 1 where PA= Partial pressure of A and PB= Partial pressure of B

**Q.**The gaseous decomposition reaction:A(g)→2B(g)+C(g), is observed to be first order over the excess of liquid water at 25oC at constant volume. It is found that after 10 minutes, the total pressure of the system is 188 torr and at completion of reaction the pressure is 388 torr. Calculate the rate constant of the reaction in hr−1. The vapour pressure of H2O at 25oC is 28 torr.

Take

ln 1.2≈0.18

- 0.018
- 1.08
- 0.24
- 0.12

**Q.**Decomposition of 3A(g)→2B(g)+2C(g) follows first-order kinetic. Initially, only A is present in the container. The pressure developed after 20 min and infinite time are 3.5 and 4 atm, respectively. Which of the following is true?

- t50%=20 min
- t75%=40 min
- t99%=64/3 min
- t87.5%=60 min

**Q.**Peptization is a :

- Process of converting soluble particles to form coloidal solution
- Process of converting a colloidal solution into precipitate
- Process of converting precipitate into colloidal solution
- Process of bringing colloidal molecule into solution

**Q.**For a reaction A+2B→C+D, the following data were obtained

The correct rate law expression will be

- Rate=k[A][B]2
- Rate=k[A]2[B]2
- Rate = k [A] [B]
- Rate=k[A]2[B]

**Q.**The Half Life period of zero order reaction was found to be 10 minutes when initial concentration was 1 mole per litre what will be the half life period if initial concentration is made to mole per litre

**Q.**The concentration of a reactant X decreases from 0.1 M to 0.025 M in 40 minutes. If the reaction follows I order kinetics, the rate of the reaction when the concentration of X is 0.01 M will be

- 3.47×10−4M min−1
- 1.73×10−4M min−1
- 1.73×10−5M min−1
- 3.47×10−5M min−1

**Q.**The gas phase decomposition of dimethyl ether follows first order kinetics.

CH3OCH3(g)→CH4(g)+H2(g)+CO(g)

The reaction is carried out in a constant volume container at 500∘C and has a half life of 30.1 minutes. Initially, only dimethyl ether is present at a presure of 0.396 atm. What is the total pressure (in atm after 12 minutes? Assume ideal gas behavior. (Give your answer upto two decimal)

(Given: 100.12=1.32)

**Q.**

Sn2 reaction depend on the what all factors

**Q.**33. If the initial concentration of reactants is reduced to half in a reaction, then the half life of a reaction becomes two times. The order of the reaction is 0 1 2 3

**Q.**41. In Arrhenius equation for certain reaction, the value of A and E (activation energy) are 4\ast10^{13}S^{-1} and 98.6 kJ mol^{-1} respectively. If the reaction is of first order, then at what temperature will its half life period be 10 minutes? log 2.88=0.4594 1.350.5 K 2.270.2 K 3.453.6K 4.311.5K

**Q.**What is the rate of reaction for a bimolecular elementary reaction?

- ZABe(−EaRT)
- ZABe(EaRT)
- −ZABe(−EaRT)
- −ZABe(EaRT)

**Q.**67. At 27^° C in presence of catalyst activation energy of a reaction is lowered by 2 kcal, then the rate of reaction increases by (1) 7 times (2) 14 times (3) 21 times (4) 28 times

**Q.**At 227^oC, the presence of a catalyst lowers the activation energy by 4606 cal. The rate of reaction will be increased by? a. 10 b. 2 c. 100 d. 100

**Q.**For the given gaseous reaction A⟶2B+C pressure after sufficient time was found to be 300 mm Hg and after time 2.303 sec, it was found to be 200 mm Hg, the half-life is (Given log 2 = 0.3010)

**Q.**

Observation no. | Time (in min) | Px (in mm Hg) |

1 | 0 | 800 |

2 | 100 | 400 |

3 | 200 | 200 |

At constant temperature and volume, X decomposes according to first order kinetics as follows:

2X(g)→3Y(g)+2Z(g)

where Px is the partial pressure of X.

Which of the following statements is true for the given reaction?

- Rate constant of reaction is 6.93×10−3 min−1
- At 200 min, 75% of the reaction completes
- When Px=700 mm Hg, the total pressure of the system is 950 mm Hg
- All of the above

**Q.**

Freshly prepared precipitate sometimes gets converted to colloidal solution by

- peptisation
- coagulation
- electrolysis
- diffusion