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CBSE - XII Science - Chemistry - Chemical Kinetics
Please ans both part
Asked by amitkumar.cis
14th January 2021,
12:40 PM
CBSE - XII Science - Chemistry - Chemical Kinetics
The experimental data for the reaction: 2A + B2 → 2AB is: Write the rate equation for the reaction?
Asked by Topperlearning User
22nd June 2016,
9:20 AM
CBSE - XII Science - Chemistry - Chemical Kinetics
(a) A reaction is second order in A and first order in B. (i)Write the differential rate equation. (ii)How is the rate affected on increasing the concentration of A three times? (iii) How is the rate affected when the concentrations of both A and B are doubled? (b)A first order reaction takes 40 minutes for 30% decomposition. Calculate t1/2 for this reaction. (Given log 1.428 = 0.1548) OR (a)For a first order reaction, show that time required for 99% completion is twice the time required for the completion of 90% of reaction. (b)Rate constant 'k' of a reaction varies with temperature 'T' according to the equation: Where Ea is the activation energy. When a graph is plotted for log k Vs straight line with a slope of -4250 K is obtained. Calculate 'Ea' for the reaction. (R = 8.314 JK-1 mol-1)
Asked by Topperlearning User
22nd June 2016,
9:19 AM
CBSE - XII Science - Chemistry - Chemical Kinetics
The rate constant for a reaction of zero order in A is 0.0030 mol L-1 s-1. How long will it take for the initial concentration of A to fall from 0.10 M to 0.075 M?
Asked by Topperlearning User
22nd June 2016,
9:18 AM
CBSE - XII Science - Chemistry - Chemical Kinetics
Derive an equation for calculating the half life of a first order reaction
Asked by Topperlearning User
22nd June 2016,
9:18 AM
CBSE - XII Science - Chemistry - Chemical Kinetics
Calculate the rate of reaction from the rate law: = k[A] [B]2, when the concentration of A and B are 0.01 M and 0.02 M respectively and k = 5.1 x 10-3 L2 mol-2 s-1.
Asked by Topperlearning User
22nd June 2016,
9:17 AM
CBSE - XII Science - Chemistry - Chemical Kinetics
In second order reaction why the graph btwn concentration and rate will be parabola and why it will be starting from origin and will open upwards?
Asked by ayushi
12th June 2016,
9:03 PM
CBSE - XII Science - Chemistry - Chemical Kinetics
IN A RADIOACTIVE EQUILIBRIUM 
, THE RATIO OF NUMBER OF ATOMS OF A TO B IS 
IF HALF LIFE OF A IS 1620 YEARS, WHAT IS THE HALF LIFE OF B?
IN A RADIOACTIVE EQUILIBRIUM , THE RATIO OF NUMBER OF ATOMS OF A TO B IS
, THE RATIO OF NUMBER OF ATOMS OF A TO B IS IF HALF LIFE OF A IS 1620 YEARS, WHAT IS THE HALF LIFE OF B?
Asked by Isha
18th January 2016,
6:43 PM
CBSE - XII Science - Chemistry - Chemical Kinetics
Half life of reaction : H2O2(aq)= H2O(l) + 1/2 O2 (g) is independent of initial concentration of H2O2 volume of O2 gas after 20 minute is 5L at 1 atm and 27degreeC and after completion of reaction is 50L. The rate constant is :
(1) 1/20 log 10 min ^-1
(2) 2.303/20 log 10 min ^-1
(3) 2.303/20 log 50/45 min ^-1
(4) 2.303/20 log 45/50 min ^-1
Asked by thakurpratyush5
14th August 2015,
7:57 PM
CBSE - XII Science - Chemistry - Chemical Kinetics
An optically active compound 'A' upon acid catalysed hydrolysis yield two optically active compounds 'B' and 'C' by pseudo first order kinetics. The observed rotation of the mixture after 20 minutes was 5 degrees and after completion of reaction was -20 degrees. If optical rotation per mole of A, B and C are 60, 40 and -80 degrees. Calculate half life of the reaction.
Asked by rohit
22nd July 2015,
2:28 AM
CBSE - XII Science - Chemistry - Chemical Kinetics
how to find log
Asked by Farooq Ahmad Shah
9th June 2015,
9:41 PM
CBSE - XII Science - Chemistry - Chemical Kinetics
The decomposition of Cl2O7 at 400K in gas phase to Cl2 and O2 is a first order reaction.
(i) After 55s at 400K, the pressure of Cl2O7 falls from 0.062 to 0.044 atm. Calculate the
rate constant.
(ii) Calculate the pressure of Cl2O7 after 100s of decomposition at this temperature.
(i) After 55s at 400K, the pressure of Cl2O7 falls from 0.062 to 0.044 atm. Calculate the
rate constant.
(ii) Calculate the pressure of Cl2O7 after 100s of decomposition at this temperature.
Asked by Bholanath Beura
11th September 2014,
9:40 PM
CBSE - XII Science - Chemistry - Chemical Kinetics
What is a first order reaction ?
Asked by NAKSHATRA
16th August 2014,
5:07 PM
CBSE - XII Science - Chemistry - Chemical Kinetics
the hydrolysis of ester was carriecout separately with0.05M HCl and 0.05M H2SO4.which one of the following is true and why?
a)K(HCl)>K(H2SO4)
b)K(HCl)>K(H2SO4)
C)K(HCl)=K(H2SO4)
d)K(HCl)=0.5K(H2SO4)
Asked by Malavika Umesh
21st June 2014,
8:08 PM
CBSE - XII Science - Chemistry - Chemical Kinetics
A first order reaction has a rate constant of 0.0051 min-1. If we begin with 0.10 M concentration of the reactant, what concentration of the reactant will be left after 3 hours?
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Chemistry - Chemical Kinetics
What is meant by the 'rate constant, k' of a reaction? If the concentration be expressed in mol L-1 units and time in seconds, what would be the units for k (i) for a zero order reaction and (ii) for a first order reaction?
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Chemistry - Chemical Kinetics
A first order decomposition reaction takes 40 minutes for 30% decomposition. Calculate its t1/2 value.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Chemistry - Chemical Kinetics
The rate of reaction between A and B increases by a factor of 100. Calculate the order of the reaction when the concentration of A is increased 10 times.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Chemistry - Chemical Kinetics
The half-life of a first order decomposition of nitramide is 2.1 hour at 25o C. Determine the time taken for the compound to decompose 99% of its original amount, rate constant = 0.2303 per hour.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Chemistry - Chemical Kinetics
The reaction A + 3B 2C obeys the rate equation: Rate = k[A]1/3 [B]3/2. Find out the order of this reaction?
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Chemistry - Chemical Kinetics
A gas phase decomposition of xy follows the rate law r = k[xy]n. what are the units of its rate constant?
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Chemistry - Chemical Kinetics
Explain why the rate of a chemical reaction does not remain uniform throughout the reaction?
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Chemistry - Chemical Kinetics
sir ...........consider the reaction A->B+C
A(g) -> B(g)+C(g)
AT TIME T=0 p1 atm -> 0atm 0atm
AT TIME T (P1-x)atm xatm xatm
where x is the decrease in partial pressure of A and increase in partial pressure of B&C.
my question is---why is there a decrease in partial pressure in A and why is there a increase in partial pressure of B and C.it is very confusing...............thank you
Asked by kaamil ahmed
15th May 2014,
7:47 AM
CBSE - XII Science - Chemistry - Chemical Kinetics
Draw schematic graphs showing the following details of the first order reactions.i) Variation of the rate of reaction with change in the concentration of the reactant. ii) Variation of In [R] Vs t and Log [Ro]/[R] vs t.
Asked by Topperlearning User
28th March 2014,
10:48 AM
CBSE - XII Science - Chemistry - Chemical Kinetics
For a chemical reaction X Y, The rate increases by the factor 2.25 when concentration of X is increased by 1.5. Derive or suggest the rate law equation and find the order of reaction.
Asked by Topperlearning User
28th March 2014,
10:16 AM
