WB JEE 2023 | Radioactivity and Nuclear Chemistry Question 1 | Chemistry

WB JEE 2023

MCQ (Single Correct Answer)

-0.25

If in case of a radio isotope the value of half-life (T$$_{1/2}$$) and decay constant ($$\lambda$$) are identical in magnitude, then their value should be

0.693/2

(0.693)$$^{1/2}$$

(0.693)$$^2$$

0.693

WB JEE 2021

MCQ (Single Correct Answer)

-0.25

For the reaction $$_7^{14}N(\alpha ,p)\,{}^{17}O$$, 1.16 MeV (Mass equivalent = 0.00124 amu) of energy is absorbed. Mass on the reactant side is 18.00567 amu and proton mass = 1.00782 amu. The atomic mass of $${}^{17}O$$ will be

17.0044 amu

16.9991 amu

17.0114 amu

16.9966 amu

WB JEE 2019

MCQ (Single Correct Answer)

-0.33

The half-life period of $${}_{53}{I^{125}}$$ is 60 days. The radioactivity after 180 days will be

25%

12.5%

33.3%

3.0%

WB JEE 2019

MCQ (Single Correct Answer)

-0.33

Consider, the radioactive disintegration

$${}_{82}{A^{210}}\buildrel {} \over \longrightarrow B\buildrel {} \over \longrightarrow C\buildrel {} \over \longrightarrow {}_{82}{A^{206}}$$

The sequence of emission can be

$$\beta$$, $$\beta$$, $$\beta$$

$$\alpha$$, $$\alpha$$, $$\beta$$

$$\beta$$, $$\beta$$, $$\gamma$$

$$\beta$$, $$\beta$$, $$\alpha$$

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