2. Long Answer Type Questions
1. Describe in detail the methods of soil treatment.
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2. What is litmus? How is it prepared?
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3. Write the general physical properties of acids and bases.
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4. Give an activity to test the acidic or basic nature of the given solution by using the China-
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class 7
rose extract as an indicator
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Explanation:
1) Options for treating contaminated soil include:
Biological treatment/bioremediation uses bacteria to break down substances in the soil. Chemical oxidation converts contaminated soils into non-hazardous soils. Soil stabilisation involves the addition of immobilizing agents to reduce a contaminants' leachability.
2) Litmus solutions can beprepared by dissolving these lichen-based dyes in neutral-pH water and observing the change in color when chemicals of unknown pH are added. Litmus paper is pH neutral paper soaked in litmus solution and dried. ... The word 'litmus' comes from old Norse with a meaning of 'to dye' or 'to stain.
3)Chemistry
Property Acid Base
Taste Sour (vinegar) Bitter (baking soda)
Smell Frequently burns nose Usually no smell (except NH3!)
Texture Sticky Slippery
Reactivity Frequently react with metals to form H2 React with many oils and fats
4)