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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.

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 .

Q.210. In a reaction, the initial concentration of the reactants increase four fold and the rate becomes eight times its initial value. The order of the reaction is

(1) 2.0

(2) 3.5

(3) 2.5

(4) 1.5

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

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?

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.

NH4NO2 =N2+2H2O

rnhow can we know dat molecularity of this is 1

what is the effect of using catalyst in a reaction on

(i) activation energy

(ii) gibbs energy of a reaction

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

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?

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

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

^{3}[B]. if B is taken in excess with respect to A, the order of the reaction would beFor 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.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})?how do we solve the logs in numericals? like 2.303/60xlog 6.2?? wat is log 6.2???

What r examples of fractional order reaction.

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

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 ${N}_{2}{O}_{5}$)

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

What is effect of catalyst on activation energy . Explain it briefly ?

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

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?

differences between a photochemical reaction and a thermochemical reaction?

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

t_{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.

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/minAt 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

WHY DIFFERENT REACTIONS PROCEED WITH DIFFERENT RATES??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.....

_{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

the reaction SO2Cl2 gives SO2 +Cl2 with k1 is a first order reaction with half life 3.15*10 to d power 4 sec. at 575K.what % of SO2Cl2 would be decomposed on heating at 575 K for 90 min.?

^{-4} and equilibrium constant is 1.5. So the rate constant of the forward reaction is_{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

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.}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?

Reason: The –I effect of Cl further stabilizes the carboxylate anion formed by the loss of the proton.

Why rate of reaction does not remain constant throughout?

H2 + I2 =2HI

rate of reaction alpha [H2 ] [I2 ]

What is the (i) molecularity and (ii) order of the reaction.

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

can a reaction have zero activation energy? nd why?

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

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 300KIn a 1st order reaction the ratio of t1/2 and t99.9% (1) 10 (2) 0.1 (3) 100 (4) 0.01

Can you also tell me different relations between t1/2 and t99% , t99% and t99.9%............and so on ....

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 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

^{+}when kept near a magnet , acts as diamagnetic substance . Q.155 Not considering the electron spin , the degeneracy of first, excited state (n=2) of H atom is (a) 2 (b) 3 (c) 4 (d) 8 Q.156 Not considering the electron spin , The degeneracy of second excited state is 9 , while the degeneracy of the first excited of the first excited state of H^{-}is (a) 1 (b) 2 (3) 4 (D) 4a 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.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 is reinforced concrete cement (RCC) ? State its uses.

Q121. A substance undergoes first order decomposition. This decomposition follows two parallel first order reactions as

The percentage distribution of B and C are :

(a) 75 % B and 25% C (b) 80% B and 20% C

(c) 60% B and 40% C (d) 90% B and 10% C

(e) 76.83% B and 23.17% C

the half life period of a first order rxn. is 60 minutes.what percentage will be left after 240 mnts????????????pls solve this

Q1=Hydrolysis of ethyl acetate is pseudo first order reaction but that of methyl acetate it is first order reaction,why?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}.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