List of top Questions asked in CBSE CLASS XII- 2026

Consider the following compounds : Chlorobenzene (I), 2,4,6-trinitrochlorobenzene (II), 2,4-dinitrochlorobenzene (III), 4-nitrochlorobenzene (IV).
The correct order of increasing rate of nucleophilic substitution reactions of these compounds is :
Assertion (A): Ethers have lower boiling points than the boiling points of alcohols.
Reason (R): This is due to the presence of hydrogen bonding in alcohols.
The half-life periods of decomposition of $\mathrm{NH_3}$ for different initial pressures are given below :

The order of the reaction is :
On hydrolysis, which of the following carbohydrates gives only $\mathrm{\beta}$-glucose ?
Which of the following transition metals shows +1 and +2 oxidation states ?
The mole fraction of a solute in 2·0 molal aqueous solution is :
On electrolysis of very dilute aqueous solution of NaCl using platinum electrodes :
Which of the following product is formed when salicylic acid is treated with $\mathrm{(CH_3CO)_2O}$ in the presence of acid ?
Which reagent is used to distinguish between primary, secondary and tertiary amines ?
The correct order of decreasing basic strength in aqueous solution of the following is :
According to Werner's theory, the primary valencies of the central metal atom :
The oxidation number of Pt in $\mathrm{[Pt(en)_2Cl_2]^{2+}}$ is :
A ray of light MN is incident normally on the face corresponding with side AB of a prism with an isosceles right-angled triangular base ABC. Trace the path of the ray as it passes through the prism when the refractive index of the prism material is \( \sqrt{2} \), and \( \sqrt{3} \).
Arora and Gurmeet were partners in a firm sharing profits and losses in the ratio of 3 : 2. Starting from 1st October, 2024 Arora withdrew ₹ 30,000 at the beginning of each quarter for his personal use. Interest on drawings was to be charged @ 12% per annum. Interest on Arora's drawings for the year ended 31st March, 2025 was:
On hydrolysis, which of the following carbohydrates gives only β-glucose ?
Consider the following compounds : Chlorobenzene (I), 2,4,6-trinitrochlorobenzene (II), 2,4-dinitrochlorobenzene (III), 4-nitrochlorobenzene (IV). The correct order of increasing ease of nucleophilic substitution reactions of these compounds is :
Which of the following transition metals shows +1 and +2 oxidation states ?
The correct order of decreasing basic strength in aqueous solution of the following is :
The mole fraction of a solute in 2.0 molal aqueous solution is :
On electrolysis of very dilute aqueous solution of NaCl using platinum electrodes :
The oxidation number of Pt in [Pt(en)2Cl2]2+ is :
Which of the following product is formed when salicylic acid is treated with (CH3CO)2O in the presence of acid ?
Which reagent is used to distinguish between primary, secondary and tertiary amines ?
Draw a neat diagram of megasporangium of an angiosperm and label any six parts.
Read the following statements : Assertion (A) and Reason (R).
Assertion (A) : General forces such as social, political, legal and technological conditions affect an individual firm only indirectly.
Reason (R) : General forces have an impact on all business enterprises, in contrast to, specific forces that affect individual firms directly and immediately in their day-to-day working.
Choose the correct alternative from the following :