1. Thin layer chromatography is

A. partition chromatography
B. electrical mobility of ionic species
C. adsorption chromatography
D. none of the above

2. In gas chromatography, the basis for separation of the components of the volatile material is the difference in

A. partition coefficients
B. conductivity
C. molecular weight
D. molarity

3. In reverse phase chromatography, the stationary phase is made

A. non-polar
B. polar
C. either non-polar or polar
D. none of these

4. Ion exchange chromatography is based on the

A. electrostatic attraction
B. electrical mobility of ionic species
C. adsorption chromatography
D. partition chromatography

5. The general expression for the appearance of a solute in an effluent is (where V is the elution volume of a substance , V₀ void volume, k_D distribution constant and V_i internal water volume)

A. V = V₀+ k_DV_i 
B. V = V₀/V_i
C. V = V₀– k_DV_i
D. V/V₀= k_DV_i