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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) specific rate constant

2) average rate constant

3) instantaneous rate constant

4) none of the above

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

_{2}O_{2}(aq) decomposes to H_{2}O (l)_{ }and O_{2}(g) in a reaction that is first order in H_{2}O_{2}and has a rate constant k= 1.06 X 10

^{-3}min^{-1}.(i) How long it will take 15 % of a sample of H

_{2}O_{2}_{ }to decompose ?(ii) How long it will take 85 % of a sample to decompose ?

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.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 increasing the temperature

B increasing the surface area of reactants

C increasing the pressure

D increasing the concentration of reactants

a first order reaction is 15% complete in 20 min.how long will it take to b 60% complete????

An organic compound A with molecular formula C8H8O gives positive DNP and iodoform tests. It does not reduce tollen's reagent or Fehling's reagent and does not decolourise bromine water also. On oxidation with Chromatic acid it gives a carboxylic acid B with molecular formula C7H6O2. Deduce the structures of A and B.

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?

what is the effect of using catalyst in a reaction on

(i) activation energy

(ii) gibbs energy of a reaction

a first order reaction is 20% complete in 10 minutes. calculate the time required for the completion of 75% of the reaction.

Give two examples each of instantaneous reactions,slow reactions and moderate speed reactions????

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?

${N}_{2}{O}_{5}\rightleftharpoons 2N{O}_{2}+\frac{1}{2}{O}_{2}$

If D is the vapour density of equilibrium mixture and ${P}_{0}$ is the initial pressure of ${N}_{2}{O}_{5}$ , then its equilibrium pressure must not be (M is the molecular mass of ${N}_{2}{O}_{5}$)

$a)\frac{{P}_{0}\left(M-2D\right)}{3D}\phantom{\rule{0ex}{0ex}}b)\frac{{P}_{0}M}{3D-M}\phantom{\rule{0ex}{0ex}}c)\frac{{P}_{0}M}{2D}\phantom{\rule{0ex}{0ex}}d)\frac{2{P}_{0}D}{M}$

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.For the reaction

4NH_{3 }+ 5O_{2}--->4NO + 6H_{2}0The rate of formation of

NOis3.6 x 10^{-3}^{ }mol L. Calculate the rate of disappearance of^{-1}s-1NHand the rate of formation of_{3}H_{2}0.1. 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})?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?

. 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?

differences between a photochemical reaction and a thermochemical reaction?

_{2}O_{5}according to the equation 2 N_{2}O_{5}(g) $\to $ 4 NO_{2}(g) +O_{2}(g)_{}is a first order reaction . After 30 min from start of decomposition in a closed vessel the total pressure developed is found to be 284.5 mm hg on complete decomposition the total pressure is 584.5 mm hg . Calculate the rate constant of the reaction (1) 2.6 05 $\times $ 10^{-3}min^{-1}(2) 26.05$\times $10^{-3}min^{-1}(3) 2.605$\times $ 10^{-2}min^{-1}(4) 2.605$\times $10^{-4}min^{-1}_{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

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

^{-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/min20. In a reaction mixture containing H

_{2}, N_{2}and NH_{3}at partial pressure of 2 atm, 1 atm and 3 atm respectively, the value of K_{p}at 4.28 x10^{-5}atm^{-2}. In which direction the net reaction will go ?N

_{2}_{(g)}+ 3H_{2}_{(g)}$\iff $ 2NH_{3}_{(g)}A) Forward B) Backward

C) No net reaction D) Direction can not be predicted

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 ?

_{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

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.....

Q.72. Among the oxides of nitrogen, ${N}_{2}O$, NO and $N{O}_{2}$, molecules with unpaired electrons are :

1. ${N}_{2}O$ and NO

2. NO and $N{O}_{2}$

3. ${N}_{2}O$ and $N{O}_{2}$

4. $N{O}_{2}$ and its dimer

Write the unit of first order rate constant of a gaseous reaction if the partial

pressure of gaseous reactant is given in bar.^{-4} and equilibrium constant is 1.5. So the rate constant of the forward reaction isThe rate of reaction A --- B becomes 27 times when the concentration of A is increased 3 times.What is the order of the reaction?

The inversion of cane sugar proceeds with half life of 50 minutes at pH = 5 for any concentration of sugar. However, if pH=6 , the half life changes to 500 minutes for any concentration of sugar. The rate law expression for the inversion of cane sugar is written as :- r = K [ sugar ] [H+]^y . Determine the value of y.

(A) r = K [sugar][H+]

(B) r = K [sugar][H+]^-1

(C) r = K [sugar][H+]^+2

(D) r = K [sugar][H+]^0

Why rate of reaction does not remain constant throughout?

_{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!!!

can a reaction have zero activation energy? nd why?

Q81. Out of 300g substance [ decomposes as per 1st order ], how much will remain after 18 hr ? (t

_{0.5}= 3 hr )1) 4.6 gm 2) 5.6 gm 3) 9.2 gm 4) 6.4 gm

Q82. 75% of a first order process is completed in 30 min. The time required for 93.75% completion of same process (in hr) ?

which is best reducing agent at 673K, C or CO?

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.... .... ... .... .....

2N2O5 (g) ➡ 4NO2 (g) + O2 (g) ; rate = k[N2O5]

N2O5(g) ➡ 2NO2 (g) +1/2 O2 (g) ; rate = k'[N2O5]

Find the relation between k and k'.

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

_{1}= 0.693 min^{–1}& another first order process C → D, K_{2}=xmin^{–1}. If 99.9% of C → D requires time same as 50% of reaction A → B, value ofx? (in min^{–1})(1) 0.0693 (2) 6.93 (3) 23.03 (4) 13.96

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 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

half life period of a substance is 50 min at certain initial concentration, when concentration is reduced to half of its initial concentration , the half life is reduced to 25 min. calculate the order

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}.