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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.

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

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

The activation energy of a first order reaction is 30 kJ/mol at 298K. The activation energy for

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 .

1) specific rate constant

2) average rate constant

3) instantaneous rate constant

4) none of the above

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.

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

For the assumed reaction X

_{2 }+ 2Y_{2}--------> 2XY_{2}, write the rate equation in terms of rate of disappearanc e of Y_{2}. (1 mark)Question) (i) If slope is equal to $-2\times {10}^{-6}se{c}^{-1}$, what will be the value of rate constant?

(ii) How does the half - life of zero order reaction relate to its rate constant?

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.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?

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

Please answer .

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.pls send le chatelier's principle table1. 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})?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.}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?

Why rate of reaction does not remain constant throughout?

differences between a photochemical reaction and a thermochemical reaction?

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

Q35. At 298 K the standard enthalpies of formation H

_{2}O (l) and H_{2}O_{2}(l) are – 286.0 kJ mol^{–1}and –188.0 kJ mol^{–1}. The enthalpy change for reaction 2H_{2}O_{2}(l) $\to $2H_{2}O(l) + O_{2}(g) will be(1) – 948 kJ mol

^{–1}(2) – 196 kJ mol

^{–1}(3) + 196 kJ mol

^{–1}(4) + 948 kJ mol

^{–1}A first order reaction is 50% complete in 30 minutes at 27° C and in 10 minutes at 47° C.calculate the activation energy.

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

^{X }[B]^{Y.}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/min_{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 ?

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

NH4NO2 =N2+2H2O

rnhow can we know dat molecularity of this is 1

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.....

. 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?

_{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

How to find the order of a reaction when rate constant is not given?

^{-4} and equilibrium constant is 1.5. So the rate constant of the forward reaction isA ——> P

the graph is b/w log[R0/ R] v/s time and the slope is a straight line passing through the origin

What is the relation between slope of this line and rate constant?

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?

Two moles of an equimolar mixture of two alcohols R1-OH and R2-OH are esterified with 1 mole of acetic acid .If 80% of the acid is comsumed and the quantities of ester formed under eqilibrium are in the ratio of3:2,what is the value of the equlibrium constant for the esterification of R1-OH ?

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

Starting with 2.5 moles of N2O5(g), in a 5 lt container how many moles/ltof N2O5 will remain after 75 seconds if the rate const for the reacn is 16.8 * 10 ^-3 s^-1

can a reaction have zero activation energy? nd why?

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

HCl formation is a zero order reaction that is carried on the surface of water.The rate of reaction is measured as the rate of increase of water level.But how does the water level increase?

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

_{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!!!

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 300K68.20 gm of CaCO_{3}is allowed to dissociate in a 5.6 litre container at 819$\xb0$C. If 50% of CaCO_{3}is dissocitated at equilibrium, the 'K_{p}' value is1) 5 atm 2) 1.6 atm

3) 4.8 atm 4) 10 atm

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 half life of actinium is 3.92 sec . starting with 0.1 g of Ac , how much would be left at the end of one minute?

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.

For the assumed reaction X

_{2 }+ 2Y_{2}--------> 2XY_{2}, write the rate equation in terms of rate of disappearance of Y_{2}. (1 mark)the half life period of a first order rxn. is 60 minutes.what percentage will be left after 240 mnts????????????pls solve this

Q. The reaction ${N}_{2}+3{H}_{2}\iff 2N{H}_{3}$ takes place at 450$\xb0$C. 1 mole of ${N}_{2}$ and 2 mole of ${H}_{2}$ are mixed in a 1 litre vessel and 1 mole of $N{H}_{3}$ is formed at equilibrium. Then what is the Kc for the above reaction?

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}.