List of top Questions asked in CBSE CLASS XII

Which functional groups of glucose interact to form cyclic hemiacetal leading to pyranose structure?
Nucleotides are composed of:
Which of the following acids represents Vitamin C?
‘Scurvy’ is caused by the deficiency of vitamin:
Two among the three components of DNA are $\beta$-D-2-deoxyribose and a heterocyclic base. The third component is:
The specific sequence in which amino acids are arranged in a protein is called:
Which of the following cells is used in hearing aids?
During electrolysis of an aqueous solution of NaCl:
Assertion (A): For a Daniell cell, Zn/Zn$^{2+}$(1M) || Cu$^{2+}$(1M)/Cu with \( E_{\text{cell}} = 1.1 \, V \), if the external opposing potential is more than 1.1 V, the electrons flow from Cu to Zn.
Reason (R): Cell acts like a galvanic cell.

Considering the strength of the ligand, the highest excitation energy will be observed in:

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: