Skip to main content

A solution of two components containing n_1 moles of the 1^ st component and n_2moles of the 2^ nd component is prepared. M_1 and M_2 are the…

JEE Main 2020 — Chemistry Physical Chemistry

2020mcqhard

A solution of two components containing n1{n}_{1}n1​ moles of the 1st {1}^{\text{st }}1st  component and n2{n}_{2}n2​moles of the 2nd {2}^{\text{nd }}2nd  component is prepared. M1{M}_{1}M1​ and M2{M}_{2}M2​ are the molecular weights of component 1 and 2 respectively. If ddd is the density of the solution in gmI−1,C2{\mathrm{gmI}}^{-1},{C}_{2}gmI−1,C2​ is the molarity and x2{x}_{2}x2​ is the mole fraction of the 2nd {2}^{\text{nd }}2nd  component, then C2{C}_{2}C2​ can be expressed as :

Official previous-year question

Held on 6 Sept 2020 · Verified 6 Jul 2026.

Options

  1. A

    C2=1000x2M1+x2(M2−M1){C}_{2}=\frac{1000{x}_{2}}{{M}_{1}+{x}_{2}({M}_{2}-{M}_{1})}C2​=M1​+x2​(M2​−M1​)1000x2​​

  2. B

    C2=dx2M1+x2(M2−M1){C}_{2}=\frac{{\mathrm{dx}}_{2}}{{M}_{1}+{x}_{2}({M}_{2}-{M}_{1})}C2​=M1​+x2​(M2​−M1​)dx2​​

  3. C

    C2=1000dx2M1+x2(M2−M1){C}_{2}=\frac{1000{\mathrm{dx}}_{2}}{{M}_{1}+{x}_{2}({M}_{2}-{M}_{1})}C2​=M1​+x2​(M2​−M1​)1000dx2​​

  4. D

    C2=dx1M2+x2(M2−M1){C}_{2}=\frac{{\mathrm{dx}}_{1}}{{M}_{2}+{x}_{2}({M}_{2}-{M}_{1})}C2​=M2​+x2​(M2​−M1​)dx1​​

Did you get this right?

Sign in to track your attempts and accuracy.

Your note

Sign in to keep a private note on this question. Nothing you write is ever public.

JEE Main Physical Chemistry in other years

Physical Chemistry 2026Physical Chemistry 2025Physical Chemistry 2024Physical Chemistry 2023Physical Chemistry 2022Physical Chemistry 2021Physical Chemistry 2019Physical Chemistry 2018Physical Chemistry 2017Physical Chemistry 2016Physical Chemistry 2015Physical Chemistry 2014

More JEE Main Physical Chemistry questions

What is the ratio of wave number of first line (lowest energy line) of Balmer series of H atomic spectrum to first line of its Brackett series?

2026medium

![JEE Main 2026 Chemistry, Structure of Atom — question figure 1](https://prepforbharat.s3.ap-south-1.amazonaws.com/exam/615f0e999476412f48314daf/Chemistry/images/Structure_of_Atom/6983c1ae8bfdbb24356397c7/question_1__q_6983c1ae8bfdbb24356397c7__cdn-question-pool.getmarks.app__28S1_q_64_1__80fd8624a7_final_ppt_sync.png) ![JEE Main 2026 Chemistry, Structure of Atom — question figure 2](https://prepforbharat.s3.ap-south-1.amazonaws.com/exam/615f0e999476412f48314daf/Chemistry/images/Structure_of_Atom/6983c1ae8bfdbb24356397c7/question_2__q_6983c1ae8bfdbb24356397c7__cdn-question-pool.getmarks.app__28S1_q_64_2__04a1587871_final_ppt_sync.png) Which of the following point in Figure 2 most accurately represents the nodal surface as shown in Figure 1?

2026medium

At 298 K, the mole percentage of $\mathrm{N}_{2}(\mathrm{~g})$ in air is $80 \%$. Water is in equilibrium with air at a pressure of 10 atm. What is the mole fraction of $\mathrm{N}_{2}(\mathrm{~g})$ in water at 298 K ? ($\mathrm{K}_{\mathrm{H}}$ for $\mathrm{N}_{2}$ is $6.5 \times 10^{7} \mathrm{~mm} \mathrm{Hg}$)

2026medium

Electricity is passed through an acidic solution of $\mathrm{Cu}^{2+}$ till all the $\mathrm{Cu}^{2+}$ was exhausted, leading to the deposition of 300 mg of Cu metal. However, a current of 600 mA was continued to pass through the same solution for another 28 minutes by keeping the total volume of the solution fixed at 200 mL. The total volume of oxygen evolved at STP during the entire process is $\_\_\_\_$ mL. (Nearest integer) [Given: $\mathrm{Cu}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightarrow \mathrm{Cu}(\mathrm{s}) \mathrm{E}_{\text {red }}^{\mathrm{o}}=+0.34 \mathrm{~V}$ $\mathrm{O}_{2}(\mathrm{~g})+4 \mathrm{H}^{+}+4 \mathrm{e}^{-} \rightarrow 2 \mathrm{H}_{2} \mathrm{O} \mathrm{E}_{\text {red }}^{\mathrm{o}}=+1.23 \mathrm{~V}$ Molar mass of $\mathrm{Cu}=63.54 \mathrm{~g} \mathrm{~mol}^{-1}$ Molar mass of $\mathrm{O}_{2}=32 \mathrm{~g} \mathrm{~mol}^{-1}$ Faraday Constant $=96500 \mathrm{C} \mathrm{mol}^{-1}$ Molar volume at $\mathrm{STP}=22.4 \mathrm{~L}$]

2026hard

Arrange the following resultant mixtures in increasing order of their pH values A. $10$ mL $0.2$ M Ca(OH)$_2$ + $25$ mL $0.1$ M HCl B. $10$ mL $0.01$ M H$_2$SO$_4$ + $10$ mL $0.01$ M Ca(OH)$_2$ C. $10$ mL $0.1$ M H$_2$SO$_4$ + $10$ mL $0.1$ M KOH Choose the correct answer from the options given below:

2026medium
View all Physical Chemistry questions

Other Chemistry topics for JEE Main

Organic Chemistry

1783 questions

Inorganic Chemistry

1476 questions

Keep practicing Physical Chemistry

Work through every JEE Main Physical Chemistry PYQ, year by year.

Browse all Chemistry topics