WB JEE 2024 | Radioactivity and Nuclear Chemistry Question 1 | Chemistry

WB JEE 2024

MCQ (Single Correct Answer)

-0.25

After the emission of a $$\beta$$-particle followed by an $$\alpha$$-particle from $${ }_{83}^{214} \mathrm{Bi}$$, the number of neutrons in the atom is -

210

128

129

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 Subjects