Q. Arrange the following solutions in order of their increasing boiling points. (i) 10⁻⁴ M NaCl (ii) 10⁻⁴ M Urea (iii) 10⁻³ M NaCl (iv) 10⁻² M NaCl
A) (i) < (ii) < (iii) < (iv)
B) (iv) < (iii) < (i) < (ii)
C) (ii) < (i) ≡ (iii) < (iv)
D) (ii) < (i) < (iii) < (iv)
Explanation
[Solution by Dr. Abubacker] The elevation of boiling point depends on $i\times$ molarity: urea $1\times10^{-4}$; 10⁻⁴ M NaCl $2\times10^{-4}$; 10⁻³ M NaCl $2\times10^{-3}$; 10⁻² M NaCl $2\times10^{-2}$. So (ii) < (i) < (iii) < (iv). Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.