Correct Option
The correct option is (c).
Explanation
Slaked lime is an inorganic compound obtained by the reaction of water with Quick Lime (Calcium Oxide). It is a strong base widely used in industrial and agricultural applications due to its alkaline nature.
Statement-wise Analysis
- Statement 1 is Incorrect. Slaked lime is chemically known as Calcium Hydroxide ($Ca(OH)_2$). Calcium Carbonate ($CaCO_3$) is the chemical name for limestone, chalk, and marble.
- Statement 2 is Correct. Since slaked lime is basic in nature, it is used in agriculture to neutralise acidic soils. This process raises the soil pH to a range suitable for crop cultivation.
- Statement 3 is Correct. Slaked lime is a basic substance. In an aqueous solution (known as lime water), it dissociates to release hydroxide ions ($OH^-$), turning red litmus paper blue.
Key Takeaway
Chemical distinctions of Calcium compounds:
- Quick Lime: Calcium Oxide ($CaO$)
- Slaked Lime: Calcium Hydroxide ($Ca(OH)_2$)
- Limestone/Marble: Calcium Carbonate ($CaCO_3$)