List of top Questions asked in CBSE CLASS XII- 2024

On adding AgNO\(_3\) solution to 1 mole of CoCl\(_3\)·4NH\(_3\), one mole of AgCl is precipitated. The secondary valency of Co is:
Ligand EDTA\(^{4-}\) is an example of a:
Which of the following ligands forms a chelate complex?
Which of the following ligands is an ambidentate ligand?

The most stable complex among the following is:

Assertion (A): Rate of reaction decreases with increase in temperature. Reason (R): Number of effective collisions increases with increase in temperature.
In the Arrhenius equation, when log k is plotted against 1/T, a straight line is obtained whose:
A reaction A$_2$ + B$_2$ → 2AB occurs by the following mechanism:
A$_2$ → A + A (slow)
A + B$_2$ → AB + B (fast)
A + B → AB (fast)
Its order would be:
For the reaction X + 2Y → P, the differential form equation of the rate law is:
The addition of a catalyst during a chemical reaction alters which of the following quantities of the reaction?
In the Arrhenius equation, when log k is plotted against 1/T, a straight line is obtained whose:

For a chemical reaction A → B, the rate doubles when the concentration of A is increased four times. The order of reaction is

The half-life of a first-order reaction with a rate constant (\( k \)) of 3 min\(^{-1}\) is:
For the elementary reaction \( P \to Q \), the rate of disappearance of ‘P’ increases by a factor of 8 upon doubling the concentration of ‘P’. The order of the reaction with respect to ‘P’ is:
The correct Mathematical expression of Arrhenius equation is:
The formation of cyanohydrin from an aldehyde is an example of:
The reaction of an alkyl halide with sodium alkoxide forming ether is known as:
Assertion (A): The pKa} of ethanoic acid is lower than that of C1} – CH2} – COOH.
Reason (R): Chlorine shows electron withdrawing (–I) effect which increases the acidic character of C1} – CH2} – COOH.
Assertion (A): Aniline is a stronger base than ammonia.
Reason (R): The unshared electron pair on nitrogen atom in aniline becomes less available for protonation due to resonance.

Williamson's synthesis of preparing dimethyl ether is a/an:

The compound which undergoes SN1 reaction most rapidly is:
Acetic acid reacts with PCl5to give:
The correct order of the ease of dehydration of the following alcohols by the action of conc. H2SO4 is:
Which of the following contains sp\(^2\) hybridized carbon bonded to X?
Which of the following is most acidic?