NCERT Solutions for Class 12 Chemistry Chemistry I Chapter 2 Solutions

Solutions Here is the CBSE Chemistry Chapter 2 for Class 12 students. Summary and detailed explanation of the lesson, including the definitions of difficult words. All of the exercises and questions and answers from the lesson's back end have been completed. NCERT Solutions for Class 12 Chemistry Solutions Chapter 2 NCERT Solutions for Class 12 Chemistry Solutions Chapter 2 The following is a summary in Hindi and English for the academic year 2025-26. You can save these solutions to your computer or use the Class 12 Chemistry.

Question 1

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Calculate the mass percentage of benzene (C₆H₆) and carbon tetrachloride (CCl₄) if 22 g of benzene is dissolved in 122 g of carbon tetrachloride.

Solution

Mass % of benzene

= \frac{mass of benzene}{mass of solution} \times 100 = \frac{22}{22 + 122} \times 100 = \frac{22}{144} \times 100 = 15.28 %

Mass% of carbon tetrachloride = 100 - 15.28
= 84.72%

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NCERT Solutions for Class 12 Chemistry Chemistry I Chapter 2 Solutions

Calculate the mass percentage of benzene (C₆H₆) and carbon tetrachloride (CCl₄) if 22 g of benzene is dissolved in 122 g of carbon tetrachloride.

Calculate the mole fraction of benzene in solution containing 30% by mass in carbon tetrachloride.

Calculate the molarity of each of the following solution (a) 30 g of Co(NO₃)₂.6H₂O in 4.3 L solution (b) 30 mL of 0.5 MH₂SO₄ diluted to 500 mL.

Calculate the mass of urea (NH₂CONH₂) required in making 2.5 kg 0.25 of molal aqueous solution.

Calculate (a) molality (b) molarity and (c) mole fraction of KI if the density of 20% (mass/mass) aqueous KI is 1.202 g mL-1.

H₂S, a toxic gas with rotten egg like smell, is used for the qualitative analysis. If the solubility of H₂S in water at S.T.P. is 0.195 m, calculate Henry's law constant.

Henry’s law constant for CO₂ in water is 1.67 x 10⁸ P_a at 298 K. Calculate the quantity of CO₂ in 500 mL of soda water when packed under 2.5 atm CO₂ pressure at 298 K.

The vapour pressure of pure liquids A and B are 450 and 700 mm Hg at 350 K respectively. Find out the composition of the liquid mixture if total vapour pressure is 600 mm Hg. Also find the composition of the vapour phase.

Vapour pressure of pure water at 298 K is 23.8 mm. 50 g of urea (NH₂CONH₂) is dissolved in 850 g of water. Calculate the vapour pressure of water for this solution and its relative lowering.

Boiling point of water at 750 mm Hg 99.63⁰C. How much sucrose is to be added to 500g of water such that it boils at 100⁰C.

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NCERT Solutions for Class 12 Chemistry Chemistry I Chapter 2 Solutions

Calculate the mass percentage of benzene (C6H6) and carbon tetrachloride (CCl4) if 22 g of benzene is dissolved in 122 g of carbon tetrachloride.

Calculate the mole fraction of benzene in solution containing 30% by mass in carbon tetrachloride.

Calculate the molarity of each of the following solution (a) 30 g of Co(NO3)2.6H2O in 4.3 L solution (b) 30 mL of 0.5 MH2SO4 diluted to 500 mL.

Calculate the mass of urea (NH2CONH2) required in making 2.5 kg 0.25 of molal aqueous solution.

Calculate (a) molality (b) molarity and (c) mole fraction of KI if the density of 20% (mass/mass) aqueous KI is 1.202 g mL-1.

H2S, a toxic gas with rotten egg like smell, is used for the qualitative analysis. If the solubility of H2S in water at S.T.P. is 0.195 m, calculate Henry's law constant.

Henry’s law constant for CO2 in water is 1.67 x 108 Pa at 298 K. Calculate the quantity of CO2 in 500 mL of soda water when packed under 2.5 atm CO2 pressure at 298 K.

The vapour pressure of pure liquids A and B are 450 and 700 mm Hg at 350 K respectively. Find out the composition of the liquid mixture if total vapour pressure is 600 mm Hg. Also find the composition of the vapour phase.

Vapour pressure of pure water at 298 K is 23.8 mm. 50 g of urea (NH2CONH2) is dissolved in 850 g of water. Calculate the vapour pressure of water for this solution and its relative lowering.

Boiling point of water at 750 mm Hg 99.630C. How much sucrose is to be added to 500g of water such that it boils at 1000C.

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

Calculate the mass percentage of benzene (C₆H₆) and carbon tetrachloride (CCl₄) if 22 g of benzene is dissolved in 122 g of carbon tetrachloride.

Calculate the molarity of each of the following solution (a) 30 g of Co(NO₃)₂.6H₂O in 4.3 L solution (b) 30 mL of 0.5 MH₂SO₄ diluted to 500 mL.

Calculate the mass of urea (NH₂CONH₂) required in making 2.5 kg 0.25 of molal aqueous solution.

H₂S, a toxic gas with rotten egg like smell, is used for the qualitative analysis. If the solubility of H₂S in water at S.T.P. is 0.195 m, calculate Henry's law constant.

Henry’s law constant for CO₂ in water is 1.67 x 10⁸ P_a at 298 K. Calculate the quantity of CO₂ in 500 mL of soda water when packed under 2.5 atm CO₂ pressure at 298 K.

Vapour pressure of pure water at 298 K is 23.8 mm. 50 g of urea (NH₂CONH₂) is dissolved in 850 g of water. Calculate the vapour pressure of water for this solution and its relative lowering.

Boiling point of water at 750 mm Hg 99.63⁰C. How much sucrose is to be added to 500g of water such that it boils at 100⁰C.