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Recent questions and answers in Chemical Kinetics
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CBSE XII
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Chemistry
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Chemical Kinetics
What is the Role of Catalyst in a Chemical Reaction
cbse
class 12
chemistry
chemical kinetics theory question
answered
Nov 4, 2020
by
shresthasushma628
2
answers
Explain Half Life of a reaction.
cbse
class 12
chemistry
chemical kinetics theory question
answered
Sep 28, 2018
by
sahilms43khan
2
answers
What is rate constant and give the Characteristics of rate constant
cbse
class 12
chemistry
chemical kinetics theory question
answered
Jun 20, 2017
by
pady_1
1
answer
What is rate constant and give the Characteristics of rate constant
cbse
class 12
chemistry
chemical kinetics theory question
answered
Jun 20, 2017
by
pady_1
1
answer
What is Photochemical Reactions? And the factors affecting the Photochemical Reaction
cbse
class 12
chemistry
chemical kinetics theory question
answered
Jun 20, 2017
by
pady_1
1
answer
What is Photochemical Reactions? And the factors affecting the Photochemical Reactions.
cbse
class 12
chemistry
chemical kinetics theory question
answered
Jun 20, 2017
by
pady_1
1
answer
Explain collision Theory of Reaction Rate
cbse
class 12
chemistry
chemical kinetics theory question
answered
Jun 16, 2017
by
pady_1
1
answer
Give the Arrhenius equation of reaction rate
cbse
class 12
chemistry
chemical kinetics theory question
answered
Jun 16, 2017
by
pady_1
1
answer
Give the Pseudo first order reaction
cbse
class 12
chemistry
chemical kinetics theory question
answered
Jun 16, 2017
by
pady_1
1
answer
Explain Half Life of a reaction.
cbse
class 12
chemistry
chemical kinetics theory question
answered
Jun 16, 2017
by
pady_1
1
answer
What is (i) Molecularity of a reaction ,(ii) Order of a reaction
cbse
class 12
chemistry
chemical kinetics theory question
answered
Jun 16, 2017
by
pady_1
1
answer
Define Rate law and Rate constant?<o:p></o:p></p>
cbse
class 12
chemistry
chemical kinetics theory question
answered
Jun 16, 2017
by
pady_1
1
answer
Define Rate law and Rate constant?<o:p></o:p><p></p>
cbse
class 12
chemistry
chemical kinetics theory question
answered
Jun 16, 2017
by
pady_1
1
answer
Define Rate of reaction and Average rate?
cbse
class 12
chemistry
chemical kinetics theory question
answered
Jun 16, 2017
by
pady_1
1
answer
The specific rate constant of a first order reaction depends on
cbse
class12
chemistry
ch-4
chemical-kinetics
answered
Jun 7, 2017
by
bharatbadu123
3
answers
The rate of which a substance reacts depends upon its
cbse
class12
chemistry
ch-4
chemical-kinetics
answered
Feb 20, 2017
by
rupeshkumar4045
2
answers
(i) A chemical reaction $2A \to 4B + C$ in gas phase occurs in a closed vessel. The concentration of $B$ is found to increase by $5 \times 10^{-3}\; mol L^{-1}$ in $10$ seconds, Calculate (a) the rate of appearance of B (b) the rate of disappearance of A. (ii)The activation energy of first order reaction at $300\;K$ is $60 kJ/mol$ . In the presence of a catalyst, the activation energy gets lowered to $50 kJ/mol$ at $300K$. How many times the reaction rate changes in presence of a catalyst at the same temperature?(iii) Define Threshold energy and activation energy. How they are related?
cbse
class12
chemistry
sec-e
ch-4
chemical-kinetics
answered
Nov 29, 2016
by
meena.p
1
answer
Explain giving reasons: (i) Transition metals and many of their compounds show paramagnetic behaviour. (ii) The enthalpies of atomisation of the transition metals are high. (iii) The transition metals generally form coloured compounds. (iv) Transition metals and their many compounds act as good catalyst.
cbse
class12
chemistry
sec-e
ch-4
chemical-kinetics
answered
Nov 29, 2016
by
meena.p
1
answer
Distinguish between rate expression and rate constant of a reaction. (ii) Can a reaction have zero activation energy ? explain (iii) Is the enthalpy of a reaction altered by a catalyst
cbse
class12
chemistry
sec-e
ch-4
chemical-kinetics
answered
Nov 29, 2016
by
meena.p
1
answer
Decomposition of phosphine $(PH_3)$ at $120^{\circ}C$ proceeds according to the equation: $4PH_3(g) \to P_4(g) + 6H_2(g)$ It is found that this reaction follows the following rate equation: Rate $= k[PH_3]$ The half-life of $PH_3$ is $37.9\;s$ at $120^{\circ}C.$ (i) How much time will be required for $\large\frac{3}{4}$ of $PH_3$ to decompose? (ii) What fraction of the original amount of $PH_3$ will remain undecomposed after 1 minute?
cbse
class12
chemistry
sec-e
ch-5
chemical-kinetics
answered
Nov 22, 2016
by
meena.p
1
answer
15.0 g of unknown molecular material was dissolved in 450 g of water. The resulting solution was found freezes at $−0.34^{\large\circ}$C. What is the molar mass of this material? ($K_f$ for water = $1.86 \;K\; kg \;mol^{−1}$)
cbse
class12
chemistry
sec-c
ch-4
chemical-kinetics
answered
Nov 16, 2016
by
meena.p
1
answer
In a hydrolysis reaction, $5\;g$ ethyl acetate is hydrolysed in presence of dilute HCl in $300\; minutes$. If the reaction is of first order and the initial concentration of ethyl acetate is $22\;g/L$, calculate the rate constant of the reaction.
cbse
class12
chemistry
sec-c
ch-4
chemical-kinetics
answered
Nov 16, 2016
by
meena.p
1
answer
Consider the decomposition of hydrogen peroxide in alkaline medium which is catalyzed by iodide cons . $2H_2O_2 \qquad \underrightarrow{-OH} \qquad 2H_2O+O_3$ This reaction takes place in two steps as given below Step I:$H_2O_2+I^{-} \to H_2O+I_0^{-}$ (slow) Step II:$H_2O_2+IO^{-} \to H_2O+I^{-}+O_2$ (fast) a) Write the rate law expression and determine the order of reaction w.r.t $H_2O_2$ b) What is the molecularity of each individual step ?
cbse
class12
chemistry
sec-b
ch-4
chemical-kinetics
answered
Nov 15, 2016
by
meena.p
1
answer
Distinguish between rate expression and rate constant of a reaction
cbse
class12
chemistry
sec-c
ch-4
chemical-kinetics
answered
Nov 10, 2016
by
meena.p
1
answer
a)i)The resistance of a conductivity cell containing $0.001\;M\; KCl$ solution at $298\;K$ is $1500 \Omega$. What is the cell constant, if the conductivity of $0.001\;M\; KCl$ solution at $298\;K$ is $0.146 \times 10^{-3}\;S\;cm^{-1}$? ii)Explain with one example each the terms weak and strong electolytes iii)The standard reduction potential values of three metallic cations $X,Y, Z$ are $+0.52, − 3.03, − 1.18 V$ respectively. What will be the order of reducing power of the corresponding metals? b) Distinguish between rate expression and rate constant of a reaction
cbse
class12
chemistry
sec-e
ch-11
chemical-kinetics
answered
Nov 10, 2016
by
meena.p
1
answer
(I)(a) Calculate the boiling point of a solution containing $0.61\;g$ of benzoic acid in $5\; g$ of $CS_2$ .Assuming $84\%$ dimerisation of acid. The boiling point and $K_b$ of $CS_2$ are $46.2^{\circ}0C$ and $2.3\; K\; Kg \;mol^{-1}$ respectively. (b) State Raoult's law for the solution containing non-volatile solute. Give its mathematical expression also. (II) A solution of $KMnO_4$ on reducing yields either a colourless solution or a brown precipitate or a green solution depending on $PH$ of the solution . What different stages of the reduction do these represent and how are they carried out ?
cbse
class12
chemistry
sec-e
ch-4
chemical-kinetics
answered
Nov 10, 2016
by
meena.p
1
answer
(a)Define the following terms : (i) Mole fraction (ii) Ideal solution (b) For the reaction $A \to B$ ,the rate of reaction becomes twenty seven times when the concentration of A is increased three times . What is the order of the reaction ?
cbse
class12
chemistry
sec-e
ch-4
chemical-kinetics
answered
Nov 9, 2016
by
meena.p
1
answer
A solution of $KMnO_4$ on reducing yields either a colourless solution or a brown precipitate or a green solution depending on $PH$ of the solution . What different stages of the reduction do these represent and how are they carried out ?
cbse
class12
chemistry
sec-c
ch-4
chemical-kinetics
answered
Nov 7, 2016
by
meena.p
1
answer
For the reaction $A \to B$ ,the rate of reaction becomes twenty seven times when the concentration of A is increased three times . What is the order of the reaction ?
cbse
class12
chemistry
sec-c
ch-4
chemical-kinetics
answered
Nov 3, 2016
by
meena.p
1
answer
Nitric oxide $NO,$ reacts with oxygen to produce nitrogen dioxide $2 NO(g)+O_2(g) \to 2NO_2(g)$ The rate law for this reaction is : $Rate = k[NO]^2 [O_2]$ Propose a mechanism for the reaction.
cbse
class12
chemistry
sec-c
ch-4
chemical-kinetics
answered
Oct 27, 2016
by
meena.p
1
answer
(a)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 $0.075\;M$ ? (b)What type of colloidal sols are formed in the following : (i) Sulphur vapours are passed through colled water (ii) White of an egg is mixed with water . (iii) Soap solution
cbse
class12
chemistry
sec-e
ch-4
chemical-kinetics
answered
Oct 25, 2016
by
meena.p
1
answer
What type of colloidal sols are formed in the following : (i) Sulphur vapours are passed through colled water (ii) White of an egg is mixed with water . (iii) Soap solution
cbse
class12
chemistry
sec-c
ch-4
chemical-kinetics
answered
Oct 24, 2016
by
meena.p
1
answer
(i)What is the freezing point of $0.4 $ molal solution of acetic acid in benzene in which it dimerises to the extent of $85\%$ Freezing point of benzene is $278.4 \;k$ and its molar heat of fusion is $10.042\;kj\; mol^{-1}$ (ii) Write balanced chemical equation for the following reactions : (a) Thermal decomposition of ammonium dichromate. (b) Reaction of $Cl_2$ with cold and deleted NaOH (c) When phosphine is passed through mercuric chloride solution .
cbse
class12
chemistry
sec-e
ch-4
chemical-kinetics
answered
Oct 24, 2016
by
meena.p
1
answer
Write balanced chemical equation for the following reactions : (a) Thermal decomposition of ammonium dichromate. (b) Reaction of $Cl_2$ with cold and deleted NaOH (c) When phosphine is passed through mercuric chloride solution .
cbse
class12
chemistry
sec-c
ch-4
chemical-kinetics
answered
Oct 19, 2016
by
meena.p
1
answer
Account for the following : (i) Transition elements show highest oxidation state in their oxides thanfluorides. (ii) Cu has positive electrode potential in the first transition series. (iii) Ionisation enthalpy of lanthanides is higher than actinides. (iv) Potassium dichromate is a good oxidising agent in acidic medium. (v) Actinides show more number of oxidation states than lanthanides.
cbse
class12
chemistry
sec-e
ch-4
chemical-kinetics
answered
Oct 18, 2016
by
meena.p
1
answer
For a complex reaction ___________
cbse
class12
chemistry
ch-4
chemical-kinetics
answered
Sep 24, 2015
by
meena.p
1
answer
Mark the incorrect statement :
cbse
class12
chemistry
ch-4
chemical-kinetics
answered
Sep 24, 2015
by
meena.p
1
answer
Which of the following statement is not correct for the catalyst ?
cbse
class12
chemistry
ch-4
chemical-kinetics
answered
Sep 24, 2015
by
meena.p
1
answer
During decomposition of an activated complex
cbse
class12
chemistry
ch-4
chemical-kinetics
answered
Sep 24, 2015
by
meena.p
1
answer
The value of rate constant of a pseudo first order reaction _____________
cbse
class12
chemistry
ch-4
chemical-kinetics
answered
Sep 24, 2015
by
meena.p
1
answer
A first order reaction is $50\%$ completed in $1.26 \times 10^{14}\;s$ . how much time would it take for $100 \%$ completion ?
cbse
class12
chemistry
ch-4
chemical-kinetics
answered
Sep 24, 2015
by
meena.p
1
answer
Activation energy of a chemical reaction can be determined by __________
cbse
class12
chemistry
ch-4
sec-a
chemical-kinetics
answered
Sep 24, 2015
by
meena.p
1
answer
In the presence of a catalyst, the heat evolved or absorbed during the reaction
cbse
class12
chemistry
ch-4
chemical-kinetics
answered
Sep 24, 2015
by
meena.p
1
answer
The role of a catalyst is to change ______________
cbse
class12
chemistry
ch-4
chemical-kinetics
answered
Sep 24, 2015
by
meena.p
1
answer
$T_{50} $ of first order reaction is 10 min storing with $10\; mol^{-1}$ rate after 20 min is
cbse
class12
chemistry
ch-4
chemical-kinetics
answered
Sep 24, 2015
by
meena.p
1
answer
According to the law of mass action, rate of a chemical reaction is proportional to
cbse
class12
chemistry
ch-4
chemical-kinetics
answered
Sep 24, 2015
by
meena.p
1
answer
Units of rate constants for first and zero order reactions in term of morality M unit are respectively
cbse
class12
chemistry
ch-4
chemical-kinetics
answered
Sep 24, 2015
by
meena.p
1
answer
The decomposition of HI on the surface of gold is
cbse
class12
chemistry
ch-4
chemical-kinetics
answered
Sep 24, 2015
by
meena.p
1
answer
In Arrhenius equation $k= Ae^{- \in a /RT}$, factor $e^{-\in a/RT}$ is known as
cbse
class12
chemistry
ch-4
sec-a
chemical-kinetics
asked
Sep 24, 2015
by
meena.p
1
answer
If concentration of reactant is increased by 'm'. then k becomes
cbse
class12
chemistry
ch-4
chemical-kinetics
asked
Sep 24, 2015
by
meena.p
1
answer
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