CBSE Class 12 Chemistry 2025 Important Question from Chapter 1 Solutions: The CBSE Class 12th Chemistry Board Exam 2025 is scheduled for February 27, 2025. Students preparing for the exam can go through the CBSE Class 12 Chemistry 2025 Important Question from Chapter 1 Solutions, which provides a set of important questions to guide their study efforts.
Mastering Chapter 1 - Solutions can significantly boost their CBSE Class 12 Chemistry score. This chapter lays the foundation for understanding numerous chemical phenomena. This article focuses on CBSE Class 12 Chemistry 2025 Important Question from Chapter 1 Solutions. By mastering these questions, students can strengthen their conceptual understanding and enhance their problem-solving skills by improving the foundation for several other key concepts within the syllabus.
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CBSE Class 12 Chemistry 2025 Important Question from Chapter 1 Solutions
Chapter 1 of CBSE Class 12 Chemistry is Solutions. This chapter covers the formation of different solution types, various methods of expressing solution concentration, Henry's Law, Raoult's Law, ideal and non-ideal solutions, deviations from Raoult's Law, colligative properties, and their correlation with molar masses of solutes, including abnormal colligative properties exhibited by some solutes. Candidates can check the Important Question from Chapter 1 Solutions below.
| Question Number |
Questions |
| Ques 1 |
Calculate the molarity of the solution containing 5 g of NaOH in 450 ML solution. |
| Ques 2 |
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. |
| Ques 3 | 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? |
| Ques 4 |
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. |
| Ques 5 |
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? |
| Ques 6 |
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? |
| Ques 7 | 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? |
| Ques 8 | 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? |
| Ques 9 |
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%. |
| Ques 10 | Calculate the amount of benzoic acid (C6H5COOH) required for preparing 250 mL of 0.15 M solution in methanol. |
| Ques 11 |
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. |
| Ques 12 |
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. |
| Ques 13 | 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. |
| Ques 14 |
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. |
The purpose of these CBSE Class 12 Chemistry 2025 Important Question from Chapter 1 Solutions is to assist students in their exam preparation. However, it is crucial to understand that these questions are for study and practice purposes only.
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