Chemistry CBSE 12 Important Numerical Questions 2025

Chemistry CBSE 12 Important Numerical Questions 2025 are given here for practice. Candidates must include these in their practice preparations.

Abhilasha Kiran

Updated on - Feb 24, 2025 | 2:12:00 PM

Chemistry CBSE 12 Important Numerical Questions 2025 are given here (Image credits: pexels.com).

Chemistry CBSE 12 Important Numerical Questions 2025: The CBSE is all set to conduct the Class 12 Chemistry paper on February 27, 2025. Students preparing can go through the Chemistry CBSE 12 Important Numerical Questions 2025 provided here. The CBSE Chemistry Class 12 Exam theory paper will be for 70 marks, and the remaining 30 marks will be given through practical exams. The CBSE 12 Chemistry Important Numerical Questions 2025 can assist students in securing at least 23 marks. Students must include these questions in their practice sessions to score well in their CBSE Chemistry exam 2025.

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Chemistry CBSE 12 Important Numerical Questions 2025

Here are some of the CBSE Important Chemistry 12 Numerical Questions 2025.

Sl.No.	Question	Answer
1	The vapour pressure of pure liquid X and pure liquid Y at 25 °C are 120 mm Hg and 160 mm Hg respectively. If equal moles of X and Y are mixed to form an ideal solution, calculate the vapour pressure of the solution.	140 mm of HG
2	An antifreeze solution is prepared by dissolving 31 g of ethylene glycol (Molar mass = 62 g mol^-1) in 600 g of water. Calculate the freezing point of the solution. (K, for water = 1.86 K kg mol^-1).	Tf= 27145
3	Calculate the mass of ascorbic acid (Molar mass = 176 g mol^-1) to be dissolved in 75 g of acetic acid, to lower its freezing point by 1.5°C. (K, = 3.9 K kg mol^-1)	Wb=5.077g
4	Calculate the mass of ascorbic acid (Molar mass = 176 g mol ^-1) to be dissolved in 75 g of acetic acid, to lower its freezing point by 1.5°C. (K, = 3.9 K kg mol ^-1)	17.46 mm
5	30 g of urea (M = 60 g mol ^-1) is dissolved in 846 g of water. Calculate the vapour pressure of water for this solution if vapour pressure of pure water at 298 K is 23.8 mm Hg.	23.5
6	Ishan's automobile radiator is filled with 1.0 kg of water. How many grams of ethylene glycol (Molar mass = 62 g mol-1) must Ishan add to get the freezing point of the solution lowered to -2.8 °C. (K, for water is 1.86 K kg mol ^-1)	Wb = 93.33 g
7	A 0.01 m aqueous solution of AlCla freezes at -0.068 °C. Calculate the percentage of dissociation. (Given : K, for water = 1.86 K kg mol ^-1]	88.3%
8	Determine the osmotic pressure of a solution prepared by dissolving 25 mg of K,so, in 2 litres of water at 25°C assuming it to be completely dissociated. (Atomic masses: K = 39 u, S = 32 u, 0 = 16 u)	5.27 x 10-3
9	A first order reaction is 40% complete in 80 minutes. Calculate the value of rate constant (k). In what time will the reaction be 90% completed? (Given : log 2 = 0.3010, log 3 = 0.4771, log 4 = 0.6021, log 5 = 0.6771, log 6 = 0.7782]	360
10	For the reaction : 2N₂O₅(g) → 4NO₂(g) + O₂(g) at 318 K Calculate the rate of reaction if rate of disappearance of N₂O₅(g) is 1.4 × 10^-3Ms -1?	7x10 ^-4Ms^-1

By dedicating sufficient time to practicing these Chemistry CBSE 12 Important Numerical Questions 2025, students can significantly improve their performance in the CBSE Class 12 Chemistry board exams 2025.

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