Students preparing for the CBSE Class 12 Board Examination in 2026 must focus on the Chemistry exam scheduled for February 28, 2026 . The 'Solutions' chapter in Chemistry is very important. It carries 7 marks in the board exam. This makes 'Solutions' one of the chapters with high marks, after 'Electrochemistry' which has 9 marks.
The CBSE Class 12 Board Exams for the 2025–26 school year will happen from February 17 to April 9, 2026 . Knowing the important questions from key chapters like 'Solutions' can help students prepare better.
About the 'Solutions' Chapter
The 'Solutions' chapter is the first chapter in the CBSE Class 12 Chemistry syllabus for the 2025-26 academic year. It teaches about the Physical Chemistry of homogeneous mixtures. Understanding this chapter well is crucial for scoring good marks in the upcoming board exam.
Important Questions for 'Solutions' Chapter
To help students prepare, here are important questions from the 'Solutions' chapter for the CBSE Class 12 Chemistry Exam 2026. Practicing these questions can help students understand the concepts better and prepare for the types of problems they might face.
| Important Questions |
| Calculate the molarity of the solution containing 5 g of NaOH in 450 ML solution. |
| If N2 gas is bubbled through water at 293K, how many millimoles of N2 gas would dissolve in 1L of water? Assume that N2 exerts a partial pressure of 0.987 bar. Given that Henry's law constant for N2 at 293K is 76.48 kbar. |
| The vapour pressure of pure benzene at a certain temperature is 0.850 bar. A non-volatile, non-electrolyte solid weighing 0.5g is added to 39.0g of benzene (molar mass 78g/mol). The vapour pressure of the solution then is 0.845 bar. What is the molecular mass of the solid substance? |
| 18 g of glucose C6H12O6 is dissolved in 1 kg of water in a saucepan. At what temperature will water boil at 1.013 bar? Kb for water is 0.52 K kg mol-1. |
| 2g of benzoic acid (C6H5COOH) dissolved in 25g of benzene shows a depression in freezing point equal to 1.62K. Molal depression constant for benzene is 4.9kg m−1. What is the percentage association of acid if it forms a dimer in solution? |
| Concentrated nitric acid used in laboratory work is 68% nitric acid by mass in aqueous solution. What should be the molarity of such a sample of the acid if the density of the solution is 1.504 g mL–1? |
| An antifreeze solution is prepared from 222.6 g of ethylene glycol (C2H6O2) and 200 g of water. Calculate the molality of the solution. If the density of the solution is 1.072 g mL–1, then what shall be the molarity of the solution? |
| What is meant by positive and negative deviations from Raoult's law, and how is the sign of DmixH related to positive and negative deviations from Raoult's law? |
| Calculate the mass of a non-volatile solute (molar mass 40 g mol–1), which should be dissolved in 114 g octane to reduce its vapour pressure to 80%. |
| Calculate the amount of benzoic acid (C6H5COOH) required for preparing 250 mL of 0.15 M solution in methanol. |
| Vapour pressure of water at 293 K is 17.535 mm Hg. Calculate the vapour pressure of water at 293 K when 25 g of glucose is dissolved in 450 g of water. |
| Benzene and toluene form an ideal solution over the entire range of composition. The vapour pressure of pure benzene and toluene at 300 K is 50.71 mm Hg and 32.06 mm Hg respectively. Calculate the mole fraction of benzene in the vapour phase if 80 g of benzene is mixed with 100 g of toluene. |
| Determine the amount of CaCl2 (i = 2.47) dissolved in 2.5 litres of water such that its osmotic pressure is 0.75 atm at 27° C. |
| Determine the osmotic pressure of a solution prepared by dissolving 25mg of K2SO4 in 2 litres of water at 25 degrees c. Assuming that it is completely dissociated. |
Tips for Exam Preparation
Students should read the official CBSE Class 12 Chemistry Textbook thoroughly. Make sure to cover all topics in the 'Solutions' chapter. Practicing these types of questions will build confidence for the exam.
