Question

give scientific reasons

Answer 1

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a) When you pass carbon dioxide through lime water, the two compounds, CO2 and Ca(OH)2 , will react to produce calcium carbonate, CaCO3 , which is an insoluble white solid that precipitates out of the solution. Due to white precipitate of CaCO3 lime water turns milky.


b) This is because the pieces of Shahabad tiles will first disintegrate into powder form then only will dissolve in HCL. But its powder is already in disintegrated form so it will automatically dissolve faster in HCL.


c) While preparing dilute sulphuric acid, concentrated sulphuric acid is added slowly to water with constant stirring because the concentrated sulphuric acid on dilution gives out a lot of heat and slowly adding the acid can avoid splashing.


d) It is recommended to use air tight containers for storing oil for long time because oxygen can affect the quality of oil and the oil can turn rancid after some days. Using an air tight container can prevent or slow down the process of rancidity.


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Answer 2

Answer:

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