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 $\alpha$-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 $\to$ 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) $3}{2}$ 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?

Subject: Chemistry, asked on 2/5/18

## what is first and second ionisation constant

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 10${}^{9}$ 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:

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 , then what will be the rate of diffusion of B?

Subject: Chemistry, asked on 21/4/18

## Solve this: Q70. $∆\mathrm{H}°$ values for complete combustion of C(s)n H(z)g and CHz(g) are –96, – 71 and – 218 Kcal per mole respectively. The $∆\mathrm{H}°$ value for the reaction : C(s) + 2H2(g) $\to$CHz(g) is        (a) – 17 Kcal                                  (b) – 81 Kcal        (c) – 20 Kcal                                  (b) – 31 Kcal

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