The CBSE Class 12 Chemistry Compartment Exam 2025 was conducted on 15 July (Tuesday) for 2.5 hours from 10:30 AM to 1:00 PM. CBSE Class 12th Compartment Question Paper 2025 for Chemistry along with the solutions is available here.
The theory paper carries a total of 80 marks and an internal assessment is for 20 marks making the exam total out of 100 marks. The exam is divided into Physical, Organic, and Inorganic Chemistry, and it includes numerical, conceptual, and application-based problems
Also Check: CBSE Class 12 2025 Question Papers With Solution Pdf
CBSE Class 12 2025 Chemistry Compartment Question Paper
| CBSE Class 12 Chemistry Compartment Question Paper 2025 | Download PDF | Check Solution |
The standard electrode potential for Sn\(^{4+}\)/Sn\(^{2+}\) couple is \(+0.15\ V\) and for Cu\(^{2+}\)/Cu couple is \(+0.73\ V\). These two couples are connected to make an electrochemical cell. The redox reaction is spontaneous. The cell potential will be:
The most stable complex among the following is:
The geometry of diamagnetic nickel complex \([ Ni(CN)_4 ]^{2-}\) is:
Out of Fe\(^{2+}\), Co\(^{2+}\), Cr\(^{3+}\), Ni\(^{2+}\), the one which shows highest magnetic moment is:
If amines are arranged in increasing order of their basic strength in gaseous phase, the correct order will be:
Which of the following does not undergo aldol condensation?
The correct IUPAC name of \((CH_3)_3C–CH_2Br\) is:
Considering the strength of the ligand, the highest excitation energy will be observed in:
For a chemical reaction A \(\rightarrow\) B, it was observed that the rate of reaction doubles when the concentration of A is increased four times. The order of the reaction is:
The IUPAC name of the complex \([ Co(NH_3 )_5(NO_2)]Cl_2\) is:
Williamson’s synthesis of preparing dimethyl ether is a/an:
The chemical test which can be used to distinguish between ethanamine and aniline is:
Assertion (A): Maltose is a reducing sugar.
Reason (R): Maltose is composed of two glucose units in which C-1 of one glucose unit is linked to C-4 of another glucose unit.
Assertion (A): Acetamide (structure: \(C_6H_5NHCOCH_3\)) is less basic than aniline.
Reason (R): Acetylation of aniline results in decrease of electron density on nitrogen.
Assertion (A): Rate constant increases with increase in temperature.
Reason (R): Increasing the temperature of the substance increases the fraction of molecules which collide with energies greater than activation energy.
Assertion (A): Cu\(^{2+}\) iodide is not known.
Reason (R): Cu\(^{2+}\) has strong tendency to oxidise I\(^{-}\) to iodine.
Write the reactions involved in the following:
(a) Reimer–Tiemann reaction
(b) Kolbe’s reaction
Draw the structures of major monohalogenation products in the following reactions:
(a) \[ NO_2–C_6H_4–CH_2CH_3\ \xrightarrow{Br_2,\ heat or UV} \]
(b) \[ C_6H_5–CH_3\ \xrightarrow{Cl_2,\ h\nu} \]
The thermal decomposition of an acid is a first-order reaction with a rate constant of \(2.3 \times 10^{-5}\ s^{-1}\) at a certain temperature. Calculate how long it will take for three-fourths of the initial quantity of acid to decompose.
(\(\log 4 = 0.6021\), \(\log 2 = 0.3010\))
Account for the following:
(i) CH\(_3\)CHO is more reactive than CH\(_3\)COCH\(_3\) towards reaction with HCN.
Give chemical tests to distinguish between the following pairs:
(i) Propanal and Propanone
Write the reaction of glucose with:
(a) HI
(a) Draw the geometrical isomers of the complex \([ Pt(NH_3)_2Cl_2 ]\).
The electrical resistance of a column of 0.05 M NaOH solution of cell constant \( 50\ cm^{-1} \) is \( 4.5 \times 10^3\ \Omega \). Calculate its resistivity, conductivity and molar conductivity.
Calculate elevation of boiling point when 4 g of MgSO\(_4\) is dissolved in 100 g water.
(Molar mass = 120 g/mol), \( K_b = 0.52\ K kg mol^{-1} \), assume complete ionisation.
Account for the following:
(a) The dipole moment of chlorobenzene is lower than that of cyclohexylchloride.
What happens when (any three):
(a) Phenyl magnesium bromide is treated with CH\(_3\)CHO followed by hydrolysis.
Give plausible explanation for the following:
(a) Diazonium salts of aromatic amines are stable.
(b) Aniline does not undergo Friedel–Crafts reaction.
(c) Aniline on nitration gives a substantial amount of meta product.
Hydrolysis of sucrose: \[ \ce{C_{12}H_{22}O_{11} + H2O \xrightarrow{H^+} C_6H_{12}O_6 + C_6H_{12}O_6} \]
(a) Rate law equation
(b) Molecularity and order of reaction
(c) What do you call such reactions?
Passage:
The particles in the nucleus of the cell, responsible for heredity, are called chromosomes which are made up of proteins and another type of biomolecules called nucleic acids. These are mainly of two types, DNA and RNA. Nucleic acids on hydrolysis yield a pentose sugar, phosphoric acid and nitrogen containing heterocyclic compound. Nucleic acids have a very diverse set of functions, such as cell creation, the storage and processing of genetic information, protein synthesis and the generation of energy cells. Although their functions may differ, the structure of DNA and RNA are very similar, with only a few fundamental differences in their molecular make-up.
Based on the above information, answer the following questions:
(a) Write two functions of DNA.
Passage:
The cause for deviation from Raoult’s law in the colligative properties of non-ideal solutions lies in the nature of interactions at the molecular level. These properties show deviations from Raoult’s law due to difference in interactions between solute–solvent, solute–solute and solvent–solvent. Some liquids on mixing form azeotropes which are binary mixtures having the same composition in liquid and vapour phase and boil at a constant temperature. In such cases, it is not possible to separate the components by fractional distillation. There are two types of azeotropes called minimum boiling azeotrope and maximum boiling azeotrope.
(a) Pure ethanol cannot be prepared by fractional distillation of ethanol–water mixture. Comment.
Attempt any five of the following:
(a) Cu\(^+\) is not stable in aqueous solution. Comment.
(a)(i) What type of battery is the lead storage battery? Write the anode and the cathode reactions and the overall reaction occurring in a lead storage battery when current is drawn from it.
(a)(i) Explain with the help of chemical reactions:
(I) Acetone is treated with semicarbazide.
Difficulty Level of CBSE Compartment Exam 2025
The CBSE Class 12 Compartment Exam 2025 was a bit easier than the 2024 exam. Most questions were from key concepts and easier to understand and solve.
| Aspect | Compartment Exam 2024 | Compartment Exam 2025 |
| Overall Difficulty Level | Moderate | Moderate to Slightly Easy |
| 1-mark & 2-mark Questions | Mostly Easy and Direct | Easy and Concept-Based |
| 3-mark Questions | Mixed – Some were straightforward, some tricky | Conceptual but Manageable |
| 4-mark Questions | Slightly Challenging, Required Deeper Understanding | Included Application-Based but Familiar Questions |
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