State the colour of the solution obtained when copper turnings are added to concentrated sulphuric acid .
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In this reaction concentrated sulphuric acid acts as a strong dehydrating agent. It dehydrates the salt and the colour changes from blue to colourless.
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Several reasons. Most important is to protect the specimen an make it a uniform thickness. Without a cover slip the objective lens on the microscope would get dirty almost every time it is used. It is very easy to touch the surface while focusing. Microscope are optical corrected for the cover slip, so not having one may produce a less sharp image. The objective lens is actually designed for an exact thickness and type of glass to produce the best possible image
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