List of top Chemistry Questions asked in CBSE CLASS XII

Write the IUPAC name of the complex \([ \text{Pt(en)}_2 \text{Cl}_2 ]^{2+}\). Draw the structure of the geometrical isomer of this complex which is optically inactive.
State a condition under which a bimolecular reaction is kinetically first-order reaction. Give an example. For which type of reactions, do order and molecularity have the same value?
What is meant by positive deviation from Raoult's law? Give an example. What type of azeotrope is formed by positive deviation?
Assertion (A): Vitamin K can be stored in our body.
Reason (R): Vitamin K is a water soluble vitamin.
Assertion (A): Actinoids show irregularities in their electronic configurations.
Reason (R): Actinoids are radioactive in nature.
Assertion (A): Cooking time is reduced in pressure cooker.
Reason (R): Boiling point of water inside the pressure cooker is elevated.
Assertion (A): A mixture of o-nitrophenol and p-nitrophenol can be separated by steam distillation.
Reason (R): o-nitrophenol is steam volatile due to intermolecular hydrogen bonding.
$\alpha$-helix structure refers to:
An amine 'X' reacts with Hinsberg reagent and the product obtained is soluble in alkali. The amine 'X' is:
When alkyl iodide is treated with large excess of ammonia, the major product obtained is:
At low temperature, phenol reacts with Br$_2$ in CS$_2$ to form:
The reaction $R$ -OH + Na $\longrightarrow$ RO$^-$ Na$^+$ + $\frac{1}{2}$ H$_2$ (g) suggests that alcohols are:
Which of the following haloalkanes react with aqueous KOH most rapidly by $S_N1$ reaction?
The number of moles of AgCl precipitated when excess AgNO$_3$ solution is mixed with one mole of [Co(NH$_3$)$_6$]Cl$_3$ is:
Which of the following represents the fraction of molecules with energies equal to or greater than E$_a$?
The activation energy (E$_a$) of a reaction can be determined from the slope of which of the following plots?
During electrolysis of dilute H$_2$SO$_4$ using platinum electrodes, the gas evolved at the anode is:
Which of the following solutions will have the highest boiling point in water?
Which of the following transition metal ion is not coloured?
Differentiate between: (i) Double salt and Complex compound.(ii) Didentate ligand and Ambidentate ligand.
How do you explain the following?
(a) Presence of an aldehydic group in glucose.
(b) Presence of five −OH groups in glucose.
Define osmotic pressure. Why is measurement of osmotic pressure method preferred for the determination of molar masses of macromolecules such as proteins and polymers?
Assertion (A): The bond angle C-O-C in ethers is slightly greater than tetrahedral angle. Reason (R): This is because of the repulsive interaction between the two bulky alkyl groups.
Assertion (A): Boiling point of (C6H5)2NH is lower than that of n-C4H9NH2. Reason (R): Hydrogen bonding is much more extensive in (C6H5)2NH as compared to n- C4H9NH2.
Assertion (A): Molecularity of reaction is determined experimentally. Reason (R): Molecularity is applicable only for an elementary reaction and not for a complex reaction.