NEET UG CHEMISTRY MCQ: SOME BASIC CONCEPTS OF CHEMISTRY

Option D ($1.66 \times 10^{-27} \mathrm{~kg}$) is correct because one atomic mass unit (amu) is defined as 1/12th the mass of a carbon-12 atom, which is approximately $1.66 \times 10^{-27} \mathrm{~kg}$.