Chemistry · PYQ NEET UG 2019(2)

The density of \( 2 \) \( \mathrm{M} \) aqueous solution of \( \mathrm{NaOH} \) is \( 1.28 \) \( \mathrm{g/cm^3} \). The molality of the solution is [Given that molecular mass of \( \mathrm{NaOH} = 40 \) \( \mathrm{g\,mol^{-1}} \)]

1. A
   \( 1.32 \) \( \mathrm{m} \)
2. B
   \( 1.20 \) \( \mathrm{m} \)
3. C
   \( 1.56 \) \( \mathrm{m} \)
4. D
   \( 1.67 \) \( \mathrm{m} \)