Explanation: The SAC resin is made up of styrene and divinyl benzene. The functional group is sulphonic acid. These resins maybe gel or macro porous in nature.

Explanation: Usually SAC resins with 6-8% cross-linking divinyl benzene is used. This resin is used to remove alkalinity, EMA and CO2. In case of no degassed this is used to remove CO2.

Explanation: The WAC resin constitutes the Polyacrylic acid with a carboxylic acid functional group. This resin removes alkalinity. This resin also removes hardness.

Explanation: The strong basic acid type I has high overall basicity. Therefore this gives good effluent quality. Indian FFIP is a type of type I SBA.

Explanation: The strong basic acid type II has low basicity. Therefore this requires more caustic acid for regeneration. Indian NIP is a type of strong basic acid type II.

Explanation: To remove organic content macro porous weak base anion resin is used. Weak basic acids can be regenerated with stoichiometric regenerated. For treatment of waters which do not provide organic fouling gel type is used.

Explanation: Coarse particle sized resins have a poor rate of exchange. These have high attrition loss. They don’t have a good backwash expansion.

Explanation: Ratio of 40% retained to ratio of 90% retained is defined as a uniform coefficient. Effective size is defined as the screen opening that will retain 90% of the screenings. Particle size distribution is determined by sieve analysis.

Explanation: The specific gravity of anion resin is 1.05-1.115. Cations are denser than anions. The density of cation resins are 1.2-1.3 gm.

Explanation: The surface area of the gel resin is 0.01 m2/gm. The surface area is extremely negligible. Macro porous resins have larger areas.