JEE Mains · Chemistry · STD 12 -1. Solution and colligative properties
\(8\,g\) of \(NaOH\) is dissolved in \(18\,g\) of \(H_2O.\) Mole fraction of \(NaOH\) in solution and molality (in \(mol\,kg^{-1}\) ) of the solution respectively are
- A \(0.2,\,22.20\)
- B \(0.2,\,11.11\)
- C \(0.167,\,11.11\)
- D \(0.167,\,22.20\)
Answer & Solution
Correct Answer
(C) \(0.167,\,11.11\)
Step-by-step Solution
Detailed explanation
Moles of \(NaOH\) \(=\,\frac {8}{40}\,=\,0.2\) Moles of \(H_2O\) \(=\,\frac {18}{18}\,=\,1\) Mole fraction of \(NaOH\) \(=\,\frac {0.2}{1.2}\,=\,0.167\) Molality \(=\,\frac {8}{40}\times \frac {1000}{18}=\,11.11\)
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Chemistry
- The vapour pressure of \(30 \% ( w / v )\) aqueous solution of glucose is \(......\,mm\,Hg\) at \(25^{\circ}\,C\).[Given : The density of \(30 \%\) (w/v), aqueous solution of glucose is \(1.2\,g\,cm ^{-3}\) and vapour pressure of pure water is \(24\,mm\,Hg\).](Molar mass of glucose is \(\left.180\,g\,mol ^{-1}.\right)\)JEE Mains 2023 Medium
- Consider the coordination compound, \([Co(NH_3)_6]Cl_3\). In the fonnation of this complex, the species which acts as the Lewis acid isJEE Mains 2014 Hard
- What is the correct order of the following elements with respect to their density ?JEE Mains 2021 Easy
- Identify from the following species in which \(\mathrm{d}^2 \mathrm{sp}^3\) hybridization is shown by central atom:JEE Mains 2024 Hard
- 200 cc of \( x \times 10^{-3} M \) potassium dichromate is required to oxidise 750 cc of 0.6 M Mohr's salt solution in acidic medium. Here x =JEE Mains 2026 Medium
- \(20\,mL\) of \(0.02\,M\,K _{2} Cr _{2} O _{7}\) solution is used for the titration of \(10 \,mL\) of \(Fe ^{2+}\) solution in the acidic medium.The molarity of \(Fe ^{2+}\) solution is ........... \(\times 10^{-2}\,M\) (Nearest Integer)JEE Mains 2022 Medium
More PYQs from JEE Mains
- Consider a mixture of gas molecule of types \(A, B\) and \(C\) having masses \(m_{A}\,<\,m_{B}\,<\,m_{C}\) ratio of their root mean square speeds at normal temperature and pressure is :JEE Mains 2021 Medium
- The least positive integer \(n\) such that \(1 - \frac{2}{3} - \frac{2}{{{3^2}}} - .... - \frac{2}{{{3^{n - 1}}}} < \frac{1}{{100}},\) isJEE Mains 2014 Hard
- If the three distinct lines \(x + 2ay + a = 0, x + 3by+ b = 0\) and \(x + 4ay + a = 0\) are concurrent, then the point \((a, b)\) lies on aJEE Mains 2014 Hard
- If the function \(f(x)=2 x^3-9 \mathrm{ax}^2+12 \mathrm{a}^2 \mathrm{x}+1\), where \(\mathrm{a} \gt 0\), attains its local maximum and local minimum values at \(p\) and \(q\), respectively, such that \(\mathrm{p}^2=\mathrm{q}\), then \(f(3)\) is equal to:JEE Mains 2025 Easy
- In a measurement, it is asked to find modulus of elasticity per unit torque applied on the system. The measured quantity has dimension of \(\left[M^a L^b T^c\right]\). If \(b=-3\), the value of \(c\) is ________JEE Mains 2025 Medium
- Two stars of masses \(3\times10^{31}\, kg\) each, and at distance \(2\times10^{11}\, m\) rotate in a plane about their common centre of mass \(O. A\) meteorite passes through \(O\) moving perpendicular to the star’s rotation plane. In order to escape from the gravitational field of this double star, the minimum speed that meteorite should have at \(O\) is : (Take Gravitational constant \(G = 6.67\times10^{-11}\, Nm^2\, kg^{-2}\))JEE Mains 2019 Medium