List of top Chemistry Questions

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:
In the Arrhenius equation, when log k is plotted against 1/T, a straight line is obtained whose:
Assertion (A): Rate of reaction decreases with increase in temperature. Reason (R): Number of effective collisions increases with increase in temperature.

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

For the reaction X + 2Y → P, the differential form equation of the rate law is:
In the Arrhenius equation, when log k is plotted against 1/T, a straight line is obtained whose:
The addition of a catalyst during a chemical reaction alters which of the following quantities of the reaction?
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 half-life of a first-order reaction with a rate constant (\( k \)) of 3 min\(^{-1}\) 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 chemical test which can be used to distinguish between ethanamine and aniline is:

If amines are arranged in increasing order of their basic strength in gaseous phase, the correct order will be:

Which of the following contains sp\(^2\) hybridized carbon bonded to X?
Which of the following is most acidic?
Acetic acid reacts with PCl5to give:
The compound which undergoes SN1 reaction most rapidly is:
The correct order of the ease of dehydration of the following alcohols by the action of conc. H2SO4 is:
Assertion (A): Uracil base is present in DNA. Reason (R): DNA undergoes self-replication.
When MnO\(_2\) is fused with KOH in air, it gives:
A hypothetical electromagnetic wave is show below.
electromagnet
The frequency of the wave is x × 1019 Hz. x = ______ (nearest integer)