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

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

Which among the following methods is used to separate the constituents present in a compound?

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

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?