CBSE 12 Chemistry Question Paper-2024 Set-1

Which one of the following first row transition elements is expected to have the highest third ionization enthalpy?

Which of the following compounds will give a ketone on oxidation with chromic anhydride (CrO₃)?

Two among the three components of DNA are β-D-2-deoxyribose and a heterocyclic base. The third component is:

On association of an electrolyte in a solvent, the van't Hoff factor:

For the reaction X + 2Y → P, the differential form of the rate law is:

The most stable oxidation state of Iron is:

The product formed as a result of reaction of CH₃MgBr and CO₂ followed by hydrolysis is:

A nucleotide is composed of a:

Which of the following alkyl halides undergoes Sₙ1 reaction most readily?

Phenol forms a dimer in benzene with van't Hoff factor 0.54. Its degree of association is:

The equilibrium Cr₂O₇²⁻ ⇌ 2CrO₄²⁻:

Which of the following is the strongest acid?

Maltose is made up of:

The system that forms maximum boiling azeotrope is:

A zero-order reaction is one whose rate is independent of:

In the Arrhenius equation, when log k is plotted against 1/T, a straight line is obtained whose:

Assertion (A): On heating a crystal of NaCl with sodium vapours, a yellow colour is imparted. Reason (R): The yellow colour is due to the formation of Schottky defects.

Assertion (A): The half-life period of a first order reaction is independent of the initial concentration of the reactant. Reason (R): The half-life period of a first order reaction is proportional to the rate constant.

Assertion (A): In an electrochemical cell, the anode is the negative electrode. Reason (R): Electrons flow from anode to cathode in an electrochemical cell.

Assertion (A): Aromatic aldehydes and ketones having at least one α-hydrogen atom undergo Cannizzaro's reaction. Reason (R): The aldehydes and ketones which undergo Cannizzaro's reaction are those which do not have an α-hydrogen atom.

Assertion (A): A solution of sucrose in water is dextrorotatory but on hydrolysis, the specific rotation becomes laevorotatory. Reason (R): Hydrolysis of sucrose yields an equimolar mixture of D-glucose and D-fructose. The laevorotation of D-fructose is more than the dextrorotation of D-glucose.

In a crystal of an ionic compound, P ions form ccp lattice and Q ions occupy all the tetrahedral voids. The formula of the ionic compound is :

In a crystal, some of the cations and anions are missing from their lattice sites. The defect is known as:

Out of the following, which one is a semiconductor?

Which of the following would be an incorrect representation for a cell at 298 K?

If a graph is plotted between log [R] and time 't' for a first order reaction, the slope of the straight line is equal to :