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Job title : Laboratory Chemist

Questions being asked in the interview :

1.Explain the term Aliquot and Diluent?
Ans: Aliquot :  It is a measured sub-volume of original sample , Diluent: Material with which sample is diluted.

2.Explain what is molality?
Ans.Molality is the number of solute that is present in 1 kg of a solvent.

3.Explain what is titration?
Ans. Titration is a process to determine the molarity of a base or an acid.  In this process a reaction is carried out between the known volumes of a solution with a known concentration, against the known volume of a solution with an unknown concentration.

4.Explain what is buffer?
Ans.A buffer is an aqueous solution which has highly stable pH. It is a blend of a weak acid and its conjugate base or vice versa. On adding small amount of base or acid to buffer, its pH hardly changes.

5.Explain what is Valency?
Ans.A valency is a property of a groups or atoms, equal to the number of atoms of hydrogen that the group or atom could combine with or displace it in forming compounds.

6.Explain what is mole?
Ans.Mole is the unit used to define the number of chemical substance present in a substance. It is the amount of substance which consists of the same number of chemical units as there are atoms in exactly 12 gram of pure carbon-12.

(Written on: 21.10.2015)

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