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Syllabus

Sulphur in vapour state exhibits paramagnetic behaviour, why?

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'.

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

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

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

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 .

Half life of a radioactive element is 160 days.After 800 days, 1g of element will reduce to(radioactive decay follow first order kinetics)?

1) specific rate constant

2) average rate constant

3) instantaneous rate constant

4) none of the above

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

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?

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-

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.What are the difference between Order and Molecularity?

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

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

_{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!!!

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 assumed reaction X

_{2 }+ 2Y_{2}--------> 2XY_{2}, write the rate equation in terms of rate of disappearanc e of Y_{2}. (1 mark)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.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.

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.

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

In 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 ....

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?

1) 60 2) 64 3) 81 4) 80

differences between a photochemical reaction and a thermochemical reaction?

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

Q13. For X $\to $ Y, $\frac{{\mathrm{k}}_{\mathrm{t}}+10}{{\mathrm{k}}_{\mathrm{t}}}=3$. If the rate constant at 300 k is 'Q' min

^{–1}, at what temperature rate constant becomes '9Q' min^{ –1}?1) 47$\xb0$C 2) 320$\xb0$ C

3) 280 K 4) $\sqrt{9\times 300}\mathrm{K}$

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

What is the difference between Activation Energy and Threshold Energy ?

Why catalyst does not catalyse non spontaneous reaction ??

a. 1/10

b. 1/8

c. 8

d. 16

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.

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.29. For $S{O}_{2}C{l}_{2\left(g\right)}\to S{O}_{2\left(g\right)}C{l}_{2\left(g\right)}$, pressure of $S{O}_{2}C{l}_{2}$ changed from 5 atm to 4 atm in 10 min. Then, pressure of $S{O}_{2}C{l}_{2}$ at the end of 30 minutes will be (in atm)

1) 2.56

2) 3.56

3) 4.56

4) 5.56

_{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

^{-4} and equilibrium constant is 1.5. So the rate constant of the forward reaction isThe reaction A(g)--> 2B(g) + C(g) is a first order . The pressure after 20 minutes and after very long time are 150 mm Hg and 225 mm Hg. The value of rate constant and pressure after 40 minutes are :-

(A) 0.05 ln 1.5 min

^{-1}, 200 mm(B) 0.5 ln 2 min

^{-1}, 300 mm(C) 0.05 ln 3 min

^{-1}, 300 mm(D) 0.05 ln 2 min

^{-1}, 200 mmThe rate of reaction A --- B becomes 27 times when the concentration of A is increased 3 times.What is the order of the reaction?

Why rate of reaction does not remain constant throughout?

14. Thermal decomposition for N

_{2}O_{5}_{(g)}follows 1^{st}order kinetics as per N_{2}O_{5(g) }+$\frac{1}{1}{O}_{2\left(g\right)}$. Initial presure of N_{2}O_{5}is 100 mm. After 10 minutes, the pressure developed is 130mm, what is rate constant?1) 0.693 min

^{-1}2) 0.025 min^{-1}3) 2.303 x 10

^{-4}min^{-1}4) 0.03 min^{-1}Give two examples each of instantaneous reactions,slow reactions and moderate speed reactions????

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?

can a reaction have zero activation energy? nd why?

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

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

Q. For ${N}_{2}$ + ${O}_{2}$$\to $2NO, initially ${N}_{2}$& ${O}_{2}$are at pressures 500 mm & 700 mm at t = 0. If the

pressure of ${N}_{2}$ is 480 mm at t = 20 min average rate of reaction is (in mm - $mi{n}^{-1}$)

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

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

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 300KNH4NO2 =N2+2H2O

rnhow can we know dat molecularity of this is 1

calculate the pH of a solution obtained by mixing 250 ml of 0.5 M HCL and 750 ml of 0.1 M NAOH

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 has the higher boiling point - 0.1M of NaCl or 0.1M glucose

H2 + I2 =2HI

rate of reaction alpha [H2 ] [I2 ]

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

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 A CERTAIN FIRST ORDER REACTION , HALF THE RTEACTION WAS DECOMPOSED IN 500 SECONDS HOW LONG IT WILL BE UNTIL 1/10IS LEFT

ANS. 1661

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}.