JEE Mains · Chemistry · STD 11 - 1. Some basic concept of chemistry
The mole fraction of a solute in a \(100\) molal aqueous solution .......... \(\times 10^{-2}\) (Round off to the Nearest Integer). [Given : Atomic masses : \(H : 1.0 \,u , O : 16.0\, u ]\)
- A \(64\)
- B \(52\)
- C \(44\)
- D \(62\)
Answer & Solution
Correct Answer
(A) \(64\)
Step-by-step Solution
Detailed explanation
\(100\) molal aqueous solution means there is \(100\) mole solute in \(1 kg =1000 gm\) water. Now, mole-fraction of solute \(=\frac{ n _{\text {solute }}}{ n _{\text {solute }}+ n _{\text {solvent }}}\) \(=\frac{100}{100+\frac{1000}{18}}=\frac{1800}{2800}=0.6428\)…
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
- Among, \(\mathrm{Sc}, \mathrm{Mn}, \mathrm{Co}\) and Cu , identify the element with highest enthalpy of atomisation. The spin only magnetic moment value of that element in its +2 oxidation state is _____ BM (in nearest integer).JEE Mains 2025 Medium
- Methods used for purification of organic compounds are based on _______.JEE Mains 2024 Medium
- The electronegativity of a group 13 element 'E' is same as that of Ge (on Pauling scale and upto one decimal point). The CORRECT statements about \(E^{3+}\) are
A. It can act as a reducing agent.
B. It can act as an oxidizing agent.
C. \(E^{3+}\) is more stable than \(E^+\).
D. The standard electrode potential value for \(E^{3+}/E\) is positive.
Choose the correct answer from the options given below:JEE Mains 2026 Hard - An organic compound is estimated through Dumus method and was found to evolve \(6\,mole\) of \(CO_2\,\,4\,moles\) of \(H_2O\) and \(1\,mole\) of nitrogen gas. The formula of the compound isJEE Mains 2019 Medium
- The coordination environment of \(\mathrm{Ca}^{2+}\) ion in its complex with \(EDTA\) \(^{4-}\) is _______.JEE Mains 2024 Medium
- \([Co_2(CO)_8]\) displaysJEE Mains 2017 Hard
More PYQs from JEE Mains
- Which among the following molecules is (a) involved in \(\mathrm{sp}^3 \mathrm{~d}\) hybridization, (b) has different bond lengths and (c) has lone pair of electrons on the central atom?JEE Mains 2025 Easy
- A point charge \(q_1=4 q_0\) is placed at origin. Another point charge \(q_2=-q_0\) is placed at \(x =12\,cm\). Charge of proton is \(q_0\). The proton is placed on \(x\)-axis so that the electrostatic force on the proton in zero. In this situation, the position of the proton from the origin is \(..........cm\).JEE Mains 2023 Medium
- Match List \(-I\) with List \(- II\)
Choose the most appropriate answer from the options given belowList \(- I\) Electronic configuration of elements List \(- II\) \(\Delta_{ i }\) in \(kJ\, mol-1\) \((a)\) \(1 s ^{2} 2 s ^{2}\) \((i)\) \(801\) \((b)\) \(1 s ^{2} 2 s ^{2} 2 p ^{4}\) \((ii)\) \(899\) \((c)\) \(1 s^{2} 2 s^{2} 2 p^{3}\) \((iii)\) \(1314\) \((d)\) \(1 s ^{2} 2 s ^{2} 2 p ^{1}\) \((iv)\) \(1402\) JEE Mains 2021 Easy - If the magnetic field in a plane electromagnetic wave is given by \(\overrightarrow{\mathrm{B}}=3 \times 10^{-8} \sin \left(1.6 \times 10^{3} \mathrm{x}+48 \times 10^{10} \mathrm{t}\right) \hat{\mathrm{j}}\; \mathrm{T}\) then what will be expression for electric field?JEE Mains 2020 Easy
- Let \(\alpha, \beta \in \mathbb{R}\) be such that the system of linear equations
\(x + 2y + z = 5\)
\(2x + y + \alpha z = 5\)
\(8x + 4y + \beta z = 18\)
has no solution. Then \(\dfrac{\beta}{\alpha}\) is equal to :JEE Mains 2026 Medium - Let \(A B C D\) be a tetrahedron such that the edges \(\mathrm{AB}, \mathrm{AC}\) and AD are mutually perpendicular. Let the areas of the triangles \(\mathrm{ABC}, \mathrm{ACD}\) and ADB be 5,6 and 7 square units respectively. Then the area (in square units) of the \(\triangle \mathrm{BCD}\) is equal to :JEE Mains 2025 Easy