Refining of petroleum is carried out using which one of the following techniques?

Which one among the following separation techniques is used for blood tests in diagnostic laboratories?

Which one of hte folowing is used for storing biological tissues?

Which one of the following processes is NOT useful for purification of solid impurities?

Which one of the following apparatus is used for separating benzene and water mixture ?

Which one of the following methods can be used to separate anthracene from a mixture of salt and anthracene ?