Call me

Have a Query? We will call you right away.

+91

E.g: 9876543210, 01112345678

We will give you a call shortly, Thank You

Office hours: 9:00 am to 9:00 pm IST (7 days a week)

What are you looking for?

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.

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

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 .

The heat of combustion of benzene at 27 0C (found by bomb calorimeter) for the

following reaction is 780 kcal mol-1.

15

C6H6(l) +

O2(g) → 6 CO2(g) + 3 H2O (l)

2

The heat evolved on burning 39 g of benzene in an open vessel will be

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

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

What are the difference between Order and Molecularity?

_{2}O_{4}is 25% dissociated at 37°C and 1 atm, calculate the percentage dissociation at 0.1 atm and 37° C.(A) 63.2% (B) 36.6% (C) 65.1% (D) 46.6%

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

_{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

what is the effect of using catalyst in a reaction on

(i) activation energy

(ii) gibbs energy of a reaction

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-

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. 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?

H2 + I2 -------- 2HI (an elementary reaction)

Initial rate=R

if the volume of the container containing the gaseous mixture is increased 2 times, then find the rate of reaction ?

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

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/minEquilibrium constant for the reaction is

CH3COOC2H5 + H2O ⇌ CH3COOH + C2H5OH

The time taken for 0.80 mole of A to produce 0.60 mole of B is 1 hour. What is the time taken for conversion of 0.90 mole of A to produce 0.675 mole of B?

(1) 1 hour (2) 30 minute (3) 15 minute (4) 5 minute

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})?2H20(aq.)→2H2O(l) + O2(g)

rate of formation of O2 is 36 g/min.

(a) What's the rate of formation of H2O?

(b) What's the rate of disappearance of H2O2?

What r examples of fractional order reaction.

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

_{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}differences between a photochemical reaction and a thermochemical reaction?

^{-4} and equilibrium constant is 1.5. So the rate constant of the forward reaction isA first order reaction is 50% complete in 30 minutes at 27° C and in 10 minutes at 47° C.calculate the activation energy.

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 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?

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

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 300KQ. 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?

(1)7.0(2)1.0(3)2.0(4)12.0

Correct Answer:?1

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.....

An endothermic reaction A------B has an activation energy of 15kcal/mol and the energy of the reaction is 5kcal/mol.what is the activation energy of the reaction B------ A?

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?

a. 1/10

b. 1/8

c. 8

d. 16

Why rate of reaction does not remain constant throughout?

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

can a reaction have zero activation energy? nd why?

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

On increasing temperature from 200 K to 220 K rate of reaction A increases by 3 times and rate of reaction B increases by 9 times then correct relationship between activation energy of A and B is :

(1) E

_{A}= 3E_{B }(2) 3E_{A}= E_{B}_{ }(3) E_{B}= 2E_{A }(4) E_{A}= 2E_{B}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?

Q.5. In an elementary reaction $A+2B\to 2C+D$. If the concentration of A is increased four times and B is decreased to half of its initial concentration then the rate becomes

(1) Twice

(2) Half

(3) Unchanged

(4) One fourth of the rate

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

20. 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

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.

The reaction A(g) + 2B(g) ---> C(g) is an elementary reaction. In an experiment involving this reaction, the initial partial pressures of A & B are Pa = 0.4 atm & Pb = 1 atm. When pressure of C becomes 0.3 atm in the reaction the rate of reaction relative to the initial rate is :-

(A) 1/12 (B) 1/50 (C) 1/25 (D) None of these

What is reinforced concrete cement (RCC) ? State its uses.

_{2}molecule at 1000$\xb0C$ and under 1.0 atm is 40 % by volume. If the dissociation is reduced to 20 % at the same temperature, the total equilibrium pressure on the gas will be?$A)1.57atm\phantom{\rule{0ex}{0ex}}B)2.57atm\phantom{\rule{0ex}{0ex}}C)3.57atm\phantom{\rule{0ex}{0ex}}D)4.57atm$

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.state the role of silica in metallurgy of copper ?

H

_{3}PO_{3 }basicity is 2 even though the acid has 3 H's. 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}.the half life period of a first order rxn. is 60 minutes.what percentage will be left after 240 mnts????????????pls solve this

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

State the role of activated complex in a reaction and state its relation with activation energy