List of top Questions asked in Bihar Board Class XII

Determine the molarity of Na$_2$CO$_3$ solution with the help of supplied H$_2$SO$_4$ solution by volumetric analysis method.
Identify one functional group in the given organic compound O₃.
Determine the presence of nitrogen atom in the given organic compound O₃.
Prepare soap in the laboratory and submit it for inspection.
How would you distinguish between the following compounds by chemical tests?
(i) Formaldehyde and Acetaldehyde
(ii) Acetaldehyde and Acetone
“Formic acid behaves both as an aldehyde and an acid.” Explain.
Determine the molarity of the given KMnO$_4$ solution with the help of supplied Mohr's salt solution by titration method.
Determine the molarity of the given KMnO$_4$ solution with the help of supplied oxalic acid solution by volumetric analysis method.
Determine the molarity of HCl solution with the help of supplied NaOH solution by volumetric analysis method.
What are isotonic solutions?
What is soap? How does it act in cleansing clothes?
How are metals refined by Bessemerisation?
What is the effect of temperature on reaction rate? What is Arrhenius equation?
What is electrochemical cell? Explain the structure of an electrochemical cell.
Explain the principle of manufacturing sulphuric acid by contact process.
Write the reaction of conc. sulphuric acid with oxalic acid.
“Compounds of transition elements are paramagnetic and coloured.” Explain.
What are the important oxidation states of lanthanide elements?
Explain the difference between a double salt and a complex salt.
Give two examples of synthetic rubber.
What are preservatives?
Arrange NH$_3$, C$_2$H$_5$NH$_2$, (C$_2$H$_5$)$_2$NH and (C$_2$H$_5$)$_3$N in the increasing order of their basic strength.
What is denaturation of proteins?
Give an example of a solution of a gas in solid.
What is peptization?