List of top Chemistry Questions asked in CBSE CLASS XII

Why is \([Ni(H_2O)_6]^{2+}\) coloured? (Atomic number of Ni = 28)
Write the oxidation state and hybridisation of the central metal in the following complex: \[ [Fe(H_2O)_6]^{3+} \quad (\text{Atomic number of Fe = 26}) \]
Which type of isomerism is exhibited by the following complex? \[ [Pt(NH_3)_2Cl_2] \]
Differentiate between homoleptic complex and heteroleptic complex.
Write the IUPAC name of the following complex: \[ K_3[Cr(C_2O_4)_3] \]
The rate of a chemical reaction doubles when the temperature is raised from 298 K to 308 K. Calculate the activation energy (\(E_a\)) for this reaction assuming it does not change with temperature. (Given: \( R = 8.314 \, \text{J mol}^{-1}\text{K}^{-1} \), \( \log 2 = 0.30 \))
Write the overall order of a reaction if A is present in large excess.
Define order of a reaction.
What are essential amino acids?
What are the products obtained on hydrolysis of sucrose?
How will you convert nitromethane to methyl isocyanide?
Complete the following equation:
Define limiting molar conductivity.
1.00 molal aqueous solution of trichloroacetic acid is heated to its boiling point. The boiling point of this solution was found to be 100.18\(^\circ\)C. Calculate the Van’t Hoff factor for trichloroacetic acid. (Given: \( K_b \) for water = 0.512 K kg mol\(^{-1}\))
Assertion (A): All aliphatic aldehydes give a positive Fehling's test.
Reason (R): Aliphatic aldehydes are reduced by Fehling's reagent.
Assertion (A): p-nitrophenol is more acidic than phenol.
Reason (R): Nitro group is an electron-withdrawing group; it stabilizes phenoxide ion by dispersal of negative charge.
The polypeptide chain in a protein has amino acids linked with each other in a specific sequence. This specific sequence of amino acids is called:
Identify the polysaccharide among the following:
Consider the following compounds: \[ (C_2H_5)_2NH,\quad C_6H_5NH_2,\quad C_6H_5CH_2NH_2,\quad NH_3,\quad (C_2H_5)_3N \] The correct increasing order of the above bases on the basis of their basic strength is:
Primary, secondary and tertiary alcohols can be distinguished by:
Which of the following ligands forms a chelate complex?
The correct formula of Hinsberg's reagent is:
Actinoids show larger number of oxidation states:
The major product of carbylamine reaction is:
Assertion (A) : Order of the reaction can be zero or fractional.
Reason (R) : We cannot determine order from balanced chemical equation.