Explanation: It is not available naturally. It is obtained by burning limestone, shells of sea animals and boulders of limestone from old river beds.

Explanation: Based on percentage of CaCO3 in limestone, lime is classified into 3 – Class A, B & C.Class A is used for masonry work, Class C is used for white washing and there is no class D.

Explanation: The three conventional classifications of lime are, Fat Lime, Hydraulic Lime and Poor Lime.

Explanation: Fat Lime is pure lime. The rest of the 3 options describe properties of poor lime.

Explanation: Quick lime is pure limestone product. It consists of oxides of calcium and is not crystalline. Pure Lime and Rich Lime are different names of Fat Lime. Lean Lime is also another name of Poor Lime.

Explanation: The clay content gives it the hydraulic property – capacity to set and harden even under water.

Explanation: Hydraulic Lime slakes at a slower rate than Pure Lime. It is subdivided into three – Feebly Hydraulic, Moderately Hydraulic (1-2 hrs) and Eminently Hydraulic (slakes with difficulty).

Explanation: Semi-Hydraulic Lime contains lesser clay content than Hydraulic Lime. Dolomitic Lime comprises of high magnesium carbonate (35-46%) content. Selentic Lime is cement of grey chalk, with added gypsum. Roman Lime does not exist, instead there is Roman Concrete which is obtained by mixing lime and volcanic ash.

Explanation: Sulphate arrests slaking and hence cement can set quickly and become stronger.

Explanation: Hydrated Lime is a highly efficient pH increasing agent. It is used as a primary coagulant for waste water treatment and contributes to the clarity of the water.