List of top Questions asked in Bihar Board Class XII

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?
What is sorption? Give an example.
What is slag?
Nobel gases have comparatively large atomic radius. Why?
What are crystalline solids? Give example.
What do you understand by point defects?
What is formed when benzene reacts with ethyl bromide in the presence of anhydrous AlCl$_3$? Give equation.
What is power alcohol?
Pyrolusite is an ore of which of the following?
The process of reduction of a metal oxide by carbon or carbon monoxide to the metal is called