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Subject: Chemistry, asked on 21/4/18

The half-life of first order decomposition of NH4NO3 is 2.1 hr at 15C temperature.
NH4NO2(aq) --> N2O(g) + 2H2O(l).

if 6.2 g of NH4NO2 is allowed to decompose calculate
1)The time required for NH4NO3 to decompose 99%
2)the volume of dry N2O produced at this point measured at STP

Subject: Chemistry, asked on 21/4/18

for a homogeneous gas phase reaction 2a--> 3b +c initial pressure of reactant was p0 while pressure at time t was p. find pressure after time 2t. assume first order reaction

Subject: Chemistry, asked on 21/4/18

Q. Nitrogen pentoxide decomposes according to equation:
2N2O5g→4NO2(g) +O2g; the first order reaction was allowed to proceed at 40°C and the data below were collected : 
[N2O5]/M Time/min
0.400 0.00
0.289 20.00
0.209 40.00
0.151 60.00
0.109 80.00

Calculate the initial rate of reaction. 
 

Subject: Chemistry, asked on 20/4/18

Solve this:

28. For a first order reaction A→P, the temperature (T) dependant rate constant (k) was found the follow the 
logk=20001T+6.0
The pre-exponential factor is.
(a) 6s-1
(b) 2 x 106 S-1
(c) 3 x 106 S-1
(d) 1 x 106 S-1

Subject: Chemistry, asked on 18/4/18

Equilibrium online mains 2018
Q.17. At a certain temperature in a 5 L vessel, 2 moles of carbon monoxide and 3 moles of chlorine were allowed to reach equilibrium according to the reaction,
CO+Cl2⇌COCl2
At equilibrium, if one mole of CO is present then equilibrium constant (KC) for the reaction is :
1. 3
2. 2.5
3. 2
4. 4

Subject: Chemistry, asked on 18/4/18

CHEM kinetics Online 2018
Q.9. For a first order reaction, A→P, t12 (half- life) is 10 days. The time required for 1th4 conversion of A (in days) is :
(ln 2 = 0.693, ln 3 = 1.1)
1. 2.5
2. 4.1
3. 5
4. 3.2

Subject: Chemistry, asked on 18/4/18

Answer this Mains 2018
Q.7. A body takes 10 minutes to cool from 60°C to 50°C. The temperature of surroundings is constant at 25°C. Then, the temperature of the body after next 10 minutes will be approximately :
1. 43°C
2. 45°C
3. 41°C
4. 47°C

Subject: Chemistry, asked on 16/4/18

Please solve
Q. An α-active radioisotope of He is kept in a sealed container. The mass of the radioisotope in the container is 5 g. The volume of He gas collected in 2 hours is 22.4 mL after disintegration of the radioisotope. What is the half-life of the radioisotope?
A. 3120.3 years
B. 3123.3 years
C. 3460.3 years
D. 3463.3 years

Subject: Chemistry, asked on 16/4/18

Please solve... i took this from laptop the interference pattern is disturbing... kindly co operate..

Subject: Chemistry, asked on 16/4/18

Please solve...

Subject: Chemistry, asked on 16/4/18

Solve this:
Q.26. Temperature coefficient of a reaction is '2'. When temperature is increased from 30°C to 90°C, the rate of reaction is increased by
(1) 60 times
(2) 64 times
(3) 150 times
(4) 400 times

Subject: Chemistry, asked on 16/4/18

Solve this:
Q.20. If 50 % of the reactant is converted into a product in a first order reaction in 25 minutes, how much of it would react in 100 minutes ?
(1) 93.75 %
(2) 87.5 %
(3) 75 %
(4) 100 %

Subject: Chemistry, asked on 16/4/18

Hoe will you show that for a zero order reaction the substance reacted is dependent on time ?

Subject: Chemistry, asked on 14/4/18

Q7

Subject: Chemistry, asked on 14/4/18

2c)

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