Question

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Answer 1

Answer:

No.1

Take a clean cotton swab and gently scrape the inside of your mouth.

Smear the cotton swab on the centre of the microscope slide for 2 to 3 seconds.

Add a drop of methylene blue solution and place a coverslip on top. Concentrated methylene blue is toxic if ingested. Wear gloves and do NOT allow children to handle methylene blue solution or have access to the bottle of solution.

Remove any excess solution by allowing a paper towel to touch one side of the coverslip.

Place the slide on the microscope, with 4 x or 10 x objective in position and find a cell. Then view at higher magnification

No.2

Iron displaces lead from the aqueous solution of copper sulphate

Similarly, metals above hydrogen in the reactivity series displace hydrogen from dilute acids.

For example :The metals such as potassium, sodium, lithium, etc. react more vigorously with dilute acids forming metal salts and hydrogen gases.

Explanation:

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Answer 2

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