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Syllabus

Sulphur in vapour state exhibits paramagnetic behaviour, why?

1) order can be determined by experiment only

2) order is not influenced by stoichiometric coefficient of the reactants

3) order of reaction is the sum of power to the concentration terms of reactants to express the rate of reaction

4) order of reaction is always a whole number

show that time required for first order reaction to go 99.9%completion is 10 times the half life period.

1. Why do we get abnormal molecular masses from colligative properties? What is Vanâ€™t Hoff factor? How will you explain cases of association and dissociation of solute in such cases?

copper(I) ion is not stable in an aqueous solution.

1) specific rate constant

2) average rate constant

3) instantaneous rate constant

4) none of the above

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 .

how to get the value of antilog(-0.1071)?

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?

this doubt is with reference to ...chemistry(part 1)-page no 269-appendix-illustration 2....

please explain me how we arrive the following step..

log x = 0.13485 - 1.0492 - 1.3711 = -3.71455

( i dont know how we get the final value as -3.7145 ....i get as -2.28545 on simplification)

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

pls send le chatelier's principle tableHow to find the order of a reaction when rate constant is not given?

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

19. The depletion of ozone involves the following steps:

$\mathrm{Step}1:{\mathrm{O}}_{3}\underset{{\mathrm{K}}_{2}}{\overset{{\mathrm{K}}_{1}}{\rightleftharpoons}}{\mathrm{O}}_{2}+\mathrm{O}\left(\mathrm{fast}\right)\phantom{\rule{0ex}{0ex}}\mathrm{Step}2:{\mathrm{O}}_{3}+\mathrm{O}\underset{\mathrm{K}}{\to}2{\mathrm{O}}_{2}\left(\mathrm{slow}\right)$

The predicted order of the reaction will be.

(1) First (2) 1.5

(3) -1.5 (4) Zero.

Equilibrium constant for the reaction is

CH3COOC2H5 + H2O ⇌ CH3COOH + C2H5OH

The rate data obtained for a hypothetical reaction,

A + B→2C, is-Expt

[A] (mol L

^{-1})[B] (mol L

^{-1})Rate(mol L

^{-1 }s^{-1})1

1.0

1.0

3.0 x 10

^{-2}2

1.5

1.0

4.5 x 10

^{-2}3

1.5

0.816

3.0 x 10

^{-2}Derive

Rate Law Expressionand calculate the value ofRate Constant (k)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.IN A CERTAIN FIRST ORDER REACTION , HALF THE RTEACTION WAS DECOMPOSED IN 500 SECONDS HOW LONG IT WILL BE UNTIL 1/10IS LEFT

ANS. 1661

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?

^{th}order.^{-1}s^{-1. }In how much time will the reaction go to completion?8. The rate law for the decomposition of N

_{2}O_{5}is : rate=k[N_{2}O_{5}]. 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 (E

_{a})?Molar conductivity of calcium ion is 119Scm

^{2}mol^{-1}and of chloride ion is 76.3S cm^{2}mol^{-1}. Calculate the limiting molar conductivity of Calcium Chloride.What r examples of fractional order reaction.

_{2}Y, the X disappears at?A) twice the rate that of appearance of X

_{2}YB) half the rate as that of disappearance of Y

please solve it!!!

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?

During the decomposition of N2O5 dissolved in carbon tetrachloride at 303K ,the following results were obtained

time in sec0 40 80 120 infinityvol. of O20 15.6 28.6 38.6 84.6collected(cc)show that the reaction is of first order....

Help.... .... ... .... .....

differences between a photochemical reaction and a thermochemical reaction?

Q1=Hydrolysis of ethyl acetate is pseudo first order reaction but that of methyl acetate it is first order reaction,why?The reaction 2N

_{2}O_{5}→ 4NO_{2 }+ O_{2}takes place in closed container. If the concentration of NO_{2 }increases by 1.6 x 10^{-2}mol/lt in 4 sec,calculate the rate of the reaction and the rate of change of concentration of N_{2}O_{5.}A first order reaction is 50% complete in 30 minutes at 27° C and in 10 minutes at 47° C.calculate the activation energy.

how do we solve the logs in numericals? like 2.303/60xlog 6.2?? wat is log 6.2???

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

^{-5}M/min(B) 3.47 x 10

^{-4}M/min(C) 3.47 x 10

^{-5}M/min(D) 1.73 x 10

^{-4}M/mint_{1}_{/2}and conc. forn^{th}order reaction is a straight line. Reaction of this nature is completed 50% in 10 minutes when conc. is 2 mol L^{–1}. This is decomposed 50% intminutes at 4 mol L^{–1},nandtare respectively(1) 0, 20 min. (2) 1, 10 min. (3) 1, 20 min. (4) 0, 5 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 ?

. The decomposition of ${N}_{2}{O}_{5}$ in $CC{I}_{4}$

Calculate its rate constant at t= 410 s and t = 1130 s. What do these results show?

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.....

_{2}O_{5}→ 2NO_{2}+ 1/2O_{2}is 24 hrs. at 30°C. Starting with 10g of N_{2}O_{5}how many grams of N_{2}O_{5}will remain after a period of 96 hours?(1) 1.25 g (2) 0.63 g (3) 1.77 g (4) 0.5 g

Please answer .

^{-4} and equilibrium constant is 1.5. So the rate constant of the forward reaction israte = k[ NO2]^2- what mechanism can be proposed to the abovereacn?

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?

_{2}is subjected to O_{2}seilent electric discharge, so that after a time 10 min. volume of ozonized oxygen is found to be 870 ml. Now, average rate of reaction in this interval is (in ml/min)(1) 3 (2) 9 (3) 90 (4) 60

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?

The kinetics of the reaction: A + 2B → Products; obeys the rate equation Rate = k [A]

^{X }[B]^{Y.}which is best reducing agent at 673K, C or CO?

2N2O5 Gives(in eqlibrium) 4NO2+O2

WAS STUDIED IN A CLOSED VESSEL IT WAS FOUND THAT CONCENTRATION OF NO2 IS INCREASES 2*1/100MOL/LS IN 5s.Calculate rate of reaction and rate of change of concentration of N2O5.

For a reaction $2{N}_{2}{O}_{5}\to 4N{O}_{2}+{O}_{2}$

Initial concentration of ${N}_{2}{O}_{5}$ is 7.2 mol L

^{-1}after20 minute $\left[N{O}_{2}\right]$ = 2.4 mol L

^{-1}. then what will berate of decomposition of ${N}_{2}{O}_{5}$ in mol L

^{-1 }min^{-1}(1) 0.06 (2) 0.03 (3) 1.3 (4) 2.4

for reaction 2A + B

_{2}------2AB . following data was obtainedS.No [A] [B

_{2}] rate1 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 [B

_{2}] is 0.04 mol lt^{-1}at 300Kcalculate the pH of a solution obtained by mixing 250 ml of 0.5 M HCL and 750 ml of 0.1 M NAOH

Which salt has a solubility that is different from the other four?

A. AgCl

B. PbBr

_{2}C. Ca

_{3}(PO_{4})_{2}D. Na

_{2}CO_{3}E. Al(OH)

_{3}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

Q. For the reaction : 2NO(g) +Cl(g) $\to $2NOCl (g)

The following data were collected. All the measurements were taken at 263 K.

(ii) Calculate the value of rate constant and specify its units.

(iii) What is the initial rate.of disappearance of $C{l}_{2}$ in exp. 4?

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.

in d haber process,N2+3H2 gives 2NH3.,,the rate of formation of ammonia is 4.8*10 to d power -3 mol/l/sec.,,,,calculate the rate of consumption of hydrogen.......????

please solve the following question:- A reaction SO_{2}Cl_{2 }---->SO_{2 }+ Cl_{2 }is a first order reaction with half life time period 3.5*10^{4}s at 320C . What percentage of SO_{2}Cl_{2}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 Λ^{0}_{m}foe acetic acid is 390.5 S cm^{2}mol^{-1}.