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Subject: Chemistry, asked on 24/5/18

Pls solve no.8 with detailed steps and explain the question .....pls dont give any link as the answer ...
Q.8. 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 20/5/18

Don't send link please give full solution.
Q.23. A radioactive isotope has a half life of 10 days. If today 125 mg is left over, what was its original weight 40 days earlier?
1) 2 g
2) 600 mg
3) 1 g
4) 1.5 g

Subject: Chemistry, asked on 20/5/18

Solve this:
Q.23. A radioactive isotope has a half life of 10 days. If today 125 mg is left over, what was its original weight 40 days earlier?
1) 2 g
2) 600 mg
3) 1 g
4) 1.5 g

Subject: Chemistry, asked on 20/5/18

Solve this:
Q.9. For the reaction A + B → C , it is found that doubling the concentration of A increases the rate by 4 times, and doubling the concentration of B doubles the reaction rate. What is the overall order of the reaction ?
1) 4
2) 32
3) 3
4) 1
 

Subject: Chemistry, asked on 16/5/18

Please explain how to solve e raised to something?

Subject: Chemistry, asked on 15/5/18

Please explain the circled part.

Subject: Chemistry, asked on 4/5/18

Plz explain the circled part

Subject: Chemistry, asked on 3/5/18

Solve this :  How to solve this question related to chemical kinetics?

18. For a certain reaction the rate law is rate=kC32. If the rate of the reaction is 0.020 mol L-1s-1 when C=1.0 M, what is the rate when C=0.60 M ?a. 0.0093mol L-1 s-1                          b. 0.012 mol L-1 s-1  c. 0.033mol L-1 s-1                            d. 0.040mol L-1 s-1


 

Subject: Chemistry, asked on 2/5/18

what is first and second ionisation constant

Subject: Chemistry, asked on 2/5/18

Q2. Not able to understand the question , pls anyone explain in easy language

Subject: Chemistry, asked on 23/4/18

Q2.(c) 92238U is radioactive and it emits a and b particles to form 82206Pb. Calculate the number of a and b particles emitted in this conversion. An ore of  92238U  is found to contain 92238U and 82206Pb in the weight ratio of 1:0.1. The half-life period of  92238U  is 4.5 x 109 years. Calculate the age of the ore.

Subject: Chemistry, asked on 22/4/18

Solve this :

70. The half life of radioactive radon is 3.8 days. The time at the end of which  1/20th of the radon sample will remain undecayed is : 
(A) 3.8 days                                 (B) 165 days 
(C) 33 days                                  (D) 76 days
 

Subject: Chemistry, asked on 22/4/18

Q. The velocity constant of a reaction at 290 K was found to be 3.2 × 10-3 S-1. When the temperature is raised to 310 K, it will be about
(A) 9.6 × 10-3                          (B)    1.28 × 10-2                   (C) 6.4 × 10-3          (D) none

Subject: Chemistry, asked on 21/4/18

Solve this:

24. If the wavelength of photon is 4.4 × 10-14 m, h = 13.2 × 10-34 Js, then momentum of photon is(a) 3 × 10-20 Kgms-1(b) 3 × 1020 Kgms-1(c) 0.33 × 1020 Kgms-1(d) 0.33 × 10-20 Kgms-1

Subject: Chemistry, asked on 21/4/18

Solve this:

11. If two molecules of A and B having mass 121 Kg and 81 Kg and rate of diffusion of A is 16 × 10-3, then what will be the rate of diffusion of B?

a 20.75 × 10-3b 20.75 × 10-4c 19.75 × 10-3d 20.75 × 10-4

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