Complete the following sentence: Lime (CaO) is added to water to produce slaked lime, Ca(OH)2. Slaked lime can be used to treat acidic soils. From this we can deduce that slaked lime is a ______

Complete the following sentence: Lime is used to neutralise flue gases such as sulfur dioxide. This is possible because lime is a ______ ; Your answer here;.

Under what soil condition do you think a farmer would treat the soil of hisfields with quick lime (calcium oxide) or slaked lime (calcium hydroxide) orchalk (calcium carbonate)?

A crop X grows well in slightly acidic soil. Which of the following substances can be added to the soil with pH = 8, in order to enhance the production of crop X?

5: (a) The soil in a field is highly acidic. List any two materials which can be added to this soil to reduce its acidity. Give the reason for your choice. [CBSE 2016](b) A gas produced in the laboratory is highly soluble in water. Its colourless solution turns pink when a few drops of phenolphthalein is added to it. What is the nature of this gas?Ans: (a) (i) Lime, (CaO) can be added to neutralize acidity.(ii) Chalk, (CaCO3) can also be added to neutralise acidity.It is because CaO and CaCO3 are basic in nature which neutralize acid present in soil.(b) The nature of gas is basic because it turns phenolphthalein pink. The following reaction takes place in aqueous solution,Example:  NH3 + H2O → NH4+ + OH-

Alkalis are bases that can neutralize acids to form salts and water.Alkalis are groups of chemicals with high pH. Alkalis can help soften potable water and remove impurities such as manganese, fluorides and organic tannins. According to the National Lime Association, heavy industries use alkali in the form of lime to absorb and neutralize sulphur oxides to aid in reducing acid rain.Lime is a manufactured product made from limestone (calcium carbonate) or dolomite (calcium magnesium carbonate). The raw material is processed into quicklime and hydrated lime. Since it is alkaline, it's often used to adjust the pH of water and soils containing acidic components. It's used to treat both drinking water and wastewater.There has been a lot of hype about the health benefits of drinking alkaline water, but those on the other side of the fence believe that that is all it is—hype. What makes alkaline water so special from the regular variety  Q 2.1A farmer adds lime to the soil before growing a crop. Outline the uses of calcium carbonate.