Question

2 Aluminium wire has radius 0.25 mm and length of
75 m. If the resistance of the wire is 10 12. Calculate
the resistivity of aluminium.​

Answer 1

Answer:

Give the chemical name and chemical formulae of the following:

(a) A reddish brown deposit formed on iron nail on exposure to damp air

(b) A greenish layer formed on copper articles on long exposure to air.

(c) A blackish tinge formed on silver vessels

(ii) Also mention condition/conditions necessary for their formation in each case.

(iii) Name the process involved and define it.