Select Board & Class
Sulphur in vapour state exhibits paramagnetic behaviour, why?
show that time required for first order reaction to go 99.9%completion is 10 times the half life period.
copper(I) ion is not stable in an aqueous solution.
For the reaction, BrO3+5Br-+6H+→3Br2+3H2O, . Find the value of
.
Rate of reaction can be expressed as:
-15d[Br-]dt=13dBr2dt
=(1.5×10-4) mol L-1 s-1.
HOW THIS 1/3 CAME ?
-dBr-dt=53×1.5×10-4molL-1s-1
= 2.5×10-4 mol L-1 s-1
PLZ ANSWER TO MY QUESTION .
a first order reaction is 15% complete in 20 min.how long will it take to b 60% complete????
a gaseous reaction, A2(g)-----B(g)+1/2C(g) shows increase in pressure from 100mm to 120mm in 5 minutes.The rate of disappearance of A2 is-
What are the difference between Order and Molecularity?
a first order reaction is 20% complete in 10 minutes. calculate the time required for the completion of 75% of the reaction.
what is the effect of using catalyst in a reaction on
(i) activation energy
(ii) gibbs energy of a reaction
1. Why do we get abnormal molecular masses from colligative properties? What is Van’t Hoff factor? How will you explain cases of association and dissociation of solute in such cases?
the rate constants of a reaction at 500K and 700K are 0.02s^-1 and 0.07s^-1 respectively. calculate the values of Ea and A
For the elementary reaction 2A + B= 3C,if the rate of appearance of C at time ' t ' is 1.3*10-4 mol L-1 s-1 ,calculate at this time (1) rate of reaction (2) rate of disappearance of A.
1. A reaction is 50% complete in 2 hours and 75% complete in 4 hours. What is the order of reaction?
2. What is meant by elementary step in a reaction?
3. Is there any reaction for which reaction rate does not decrease with time?
4. Express the relation between the half- life period of a reactant and it’s initial concentration, if the reaction involved is of second order?
5. Express the relation between the half life period of a reactant and it’s initial concentration for a reaction of nth order.
6. How does the value of rate constant vary with reactant concentration?
7. A substance with initial concentration ‘a’ follows zero order kinetics with the rate constant ‘k’ mol L-1s-1. In how much time will the reaction go to completion?
8. The rate law for the decomposition of N2O5 is : rate=k[N2O5]. What is the significance of `k` in this equation?
9. The reaction of 2H2(g)+O2(g) à2H2O(l) is thermodynamically feasible. How is it that a mixture of Hydrogen and Oxygen kept at room temperature shows no tendency to form water?
10. Why is it that instantaneous rate of reaction does not change when a part of reacting solution is taken out?
11. For a reaction A+H2O àB { rate α [A]}.
What is it`s (1) molecularity
(2) order of reaction
12. Following graph is a plot of the rate of reaction vs. concentration of the treactant.
What is the order of the reaction?
13. What is the usefulness of initial rate method?
14. What is the difference between average rate and instantaneous rate of a chemical reaction?
15. The half life of reaction is 50 minutes. What will be the order of reaction if reaction goes to completion in 100minutes?
16. In the reaction A à B, if the concentration of A is plotted against time, the nature of the curve obtained will be as shown in the figure. What is the order of reaction?
17. For a hypothetical reaction A + 2B à C, it is found that the rate = k [A][B].
What is the most likely rate determining step?
18. 87.5% of the substance disintegrated in 45 minutes ( first order reaction). What is its
half life?
19. What is the shape of graph between log k vs. 1/T ?
What is the relation between its slope and activation energy (Ea)?
What r examples of fractional order reaction.
What is effect of catalyst on activation energy . Explain it briefly ?
time taken for first order rxn, 2 reduce initial conc. by factor of 1/4 is 10min.if the conc. is reduced to 1/16 then the time required is?
differences between a photochemical reaction and a thermochemical reaction?
A first order reaction is 50% complete in 30 minutes at 27° C and in 10 minutes at 47° C.calculate the activation energy.
For a first order reaction (A) -----> Products the concentration of A changes from 0.1M to 0.025M in 40minutes. The rate of reaction when the concentration of A is 0.01A is :
(A) 1.73 x 10-5M/min
(B) 3.47 x 10-4M/min
(C) 3.47 x 10-5M/min
(D) 1.73 x 10-4M/min
At 300K a certain reaction is 50% complete is 20 minutes . At 350 K , the same reaction is 50% complete in 5 minutes . Calculate the activation energy
What is the difference between Activation Energy and Threshold Energy ?
find d two third life(t2/3)of a first order reaction in which k=5.48*10 to d power -14 sec.......plsss tell me.....
The rate of reaction A --- B becomes 27 times when the concentration of A is increased 3 times.What is the order of the reaction?
Why rate of reaction does not remain constant throughout?
Give two examples each of instantaneous reactions,slow reactions and moderate speed reactions????
can a reaction have zero activation energy? nd why?
which is best reducing agent at 673K, C or CO?
for reaction 2A + B2------2AB . following data was obtained
S.No [A] [B2] rate
1 0.015 0.15 1.8 x 10-3
2 0.09 0.15 1.08 x 10-2
3 0.015 0.45 5.4 x 10-3
calculate the rate constant and rate of formation of AB when [A] is 0.02 and [B2] is 0.04 mol lt-1 at 300K
calculate the pH of a solution obtained by mixing 250 ml of 0.5 M HCL and 750 ml of 0.1 M NAOH
The decomposition of PH3 proceeds according to the following equation
4PH3(g)-----------------> P4(g) + 6H2(g)
rate=k[PH3] , t1/2=37.9 s at 120 degrees
how much time is required for 3/4th of PH3 to decompose?
What is the concentration of PH3 after 1 min?
which has the higher boiling point - 0.1M of NaCl or 0.1M glucose
a first order reaction has rate constant 0.0051 min-1. if we begin with 0.10M cconcentration of the reactant, what concentration of reactant will remain in solution after 3 hours?
THE ANSWER OF THIS QUESTION IS 4.097 *10-3.
KINDLY MATCH THIS ANSWER AND PLEASE WRITE EACH STEP AS I AM NOT GETTING THE STEPS.
please solve the following question:- A reaction SO2Cl2 ---->SO2 + Cl2 is a first order reaction with half life time period 3.5*104s at 320C . What percentage of SO2Cl2 would be decomposed on heating at 320 C FOR 90 mins.
What is reinforced concrete cement (RCC) ? State its uses.
the half life period of a first order rxn. is 60 minutes.what percentage will be left after 240 mnts????????????pls solve this
The conductivity of 0.001028 mol l-1 acetic acid is 4.94*10-5 S cm-1 .can you calculate its dissociation constant if Λ0m foe acetic acid is 390.5 S cm2 mol-1.
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Syllabus
Sulphur in vapour state exhibits paramagnetic behaviour, why?
show that time required for first order reaction to go 99.9%completion is 10 times the half life period.
copper(I) ion is not stable in an aqueous solution.
For the reaction, BrO3+5Br-+6H+→3Br2+3H2O,
. Find the value of
.
SolutionRate of reaction can be expressed as:
-15d[Br-]dt=13dBr2dt
=
(1.5×10-4) mol L-1 s-1.
HOW THIS 1/3 CAME ?
-dBr-dt=53×1.5×10-4molL-1s-1
= 2.5×10-4 mol L-1 s-1
PLZ ANSWER TO MY QUESTION .
a first order reaction is 15% complete in 20 min.how long will it take to b 60% complete????
a gaseous reaction, A2(g)-----B(g)+1/2C(g) shows increase in pressure from 100mm to 120mm in 5 minutes.The rate of disappearance of A2 is-
What are the difference between Order and Molecularity?
a first order reaction is 20% complete in 10 minutes. calculate the time required for the completion of 75% of the reaction.
what is the effect of using catalyst in a reaction on
(i) activation energy
(ii) gibbs energy of a reaction
1. Why do we get abnormal molecular masses from colligative properties? What is Van’t Hoff factor? How will you explain cases of association and dissociation of solute in such cases?
the rate constants of a reaction at 500K and 700K are 0.02s^-1 and 0.07s^-1 respectively. calculate the values of Ea and A
Equilibrium constant for the reaction is
CH3COOC2H5 + H2O ⇌ CH3COOH + C2H5OH
For the elementary reaction 2A + B= 3C,if the rate of appearance of C at time ' t ' is 1.3*10-4 mol L-1 s-1 ,calculate at this time (1) rate of reaction (2) rate of disappearance of A.
1. A reaction is 50% complete in 2 hours and 75% complete in 4 hours. What is the order of reaction?
3. Is there any reaction for which reaction rate does not decrease with time?
4. Express the relation between the half- life period of a reactant and it’s initial concentration, if the reaction involved is of second order?
8. The rate law for the decomposition of N2O5 is : rate=k[N2O5]. What is the significance of `k` in this equation?
9. The reaction of 2H2(g)+O2(g) à2H2O(l) is thermodynamically feasible. How is it that a mixture of Hydrogen and Oxygen kept at room temperature shows no tendency to form water?
10. Why is it that instantaneous rate of reaction does not change when a part of reacting solution is taken out?
11. For a reaction A+H2O àB { rate α [A]}.
What is it`s (1) molecularity
(2) order of reaction
12. Following graph is a plot of the rate of reaction vs. concentration of the treactant.
What is the order of the reaction?
13. What is the usefulness of initial rate method?
14. What is the difference between average rate and instantaneous rate of a chemical reaction?
15. The half life of reaction is 50 minutes. What will be the order of reaction if reaction goes to completion in 100minutes?
16. In the reaction A à B, if the concentration of A is plotted against time, the nature of the curve obtained will be as shown in the figure. What is the order of reaction?
17. For a hypothetical reaction A + 2B à C, it is found that the rate = k [A][B].
What is the most likely rate determining step?
18. 87.5% of the substance disintegrated in 45 minutes ( first order reaction). What is its
half life?
19. What is the shape of graph between log k vs. 1/T ?
What is the relation between its slope and activation energy (Ea)?
What r examples of fractional order reaction.
What is effect of catalyst on activation energy . Explain it briefly ?
time taken for first order rxn, 2 reduce initial conc. by factor of 1/4 is 10min.if the conc. is reduced to 1/16 then the time required is?
differences between a photochemical reaction and a thermochemical reaction?
A first order reaction is 50% complete in 30 minutes at 27° C and in 10 minutes at 47° C.calculate the activation energy.
For a first order reaction (A) -----> Products the concentration of A changes from 0.1M to 0.025M in 40minutes. The rate of reaction when the concentration of A is 0.01A is :
(A) 1.73 x 10-5M/min
(B) 3.47 x 10-4M/min
(C) 3.47 x 10-5M/min
(D) 1.73 x 10-4M/min
At 300K a certain reaction is 50% complete is 20 minutes . At 350 K , the same reaction is 50% complete in 5 minutes . Calculate the activation energy
What is the difference between Activation Energy and Threshold Energy ?
a. 1/10
b. 1/8
c. 8
d. 16
find d two third life(t2/3)of a first order reaction in which k=5.48*10 to d power -14 sec.......plsss tell me.....
(1) 1.25 g (2) 0.63 g (3) 1.77 g (4) 0.5 g
The rate of reaction A --- B becomes 27 times when the concentration of A is increased 3 times.What is the order of the reaction?
Why rate of reaction does not remain constant throughout?
Give two examples each of instantaneous reactions,slow reactions and moderate speed reactions????
can a reaction have zero activation energy? nd why?
which is best reducing agent at 673K, C or CO?
For a reaction
Initial concentration of is 7.2 mol L-1 after
20 minute = 2.4 mol L-1. then what will be
rate of decomposition of in mol L-1 min-1
(1) 0.06 (2) 0.03 (3) 1.3 (4) 2.4
for reaction 2A + B2------2AB . following data was obtained
S.No [A] [B2] rate
1 0.015 0.15 1.8 x 10-3
2 0.09 0.15 1.08 x 10-2
3 0.015 0.45 5.4 x 10-3
calculate the rate constant and rate of formation of AB when [A] is 0.02 and [B2] is 0.04 mol lt-1 at 300K
calculate the pH of a solution obtained by mixing 250 ml of 0.5 M HCL and 750 ml of 0.1 M NAOH
The decomposition of PH3 proceeds according to the following equation
4PH3(g)-----------------> P4(g) + 6H2(g)
rate=k[PH3] , t1/2=37.9 s at 120 degrees
how much time is required for 3/4th of PH3 to decompose?
What is the concentration of PH3 after 1 min?
which has the higher boiling point - 0.1M of NaCl or 0.1M glucose
a first order reaction has rate constant 0.0051 min-1. if we begin with 0.10M cconcentration of the reactant, what concentration of reactant will remain in solution after 3 hours?
THE ANSWER OF THIS QUESTION IS 4.097 *10-3.
KINDLY MATCH THIS ANSWER AND PLEASE WRITE EACH STEP AS I AM NOT GETTING THE STEPS.
please solve the following question:- A reaction SO2Cl2 ---->SO2 + Cl2 is a first order reaction with half life time period 3.5*104s at 320C . What percentage of SO2Cl2 would be decomposed on heating at 320 C FOR 90 mins.
What is reinforced concrete cement (RCC) ? State its uses.
the half life period of a first order rxn. is 60 minutes.what percentage will be left after 240 mnts????????????pls solve this
The conductivity of 0.001028 mol l-1 acetic acid is 4.94*10-5 S cm-1 .can you calculate its dissociation constant if Λ0m foe acetic acid is 390.5 S cm2 mol-1.