Lustre of aluminium utensils disappear af-tersome days.Why ?

Verdigris formed on copper utensils after somedays why?

Lusture of magnesium disappeared fast when it placed in open space why?

Give reasons (vi) Aluminium utensils cannot be kept in water overnight

Which of the properties of metals is utilized in the following instances: Aluminium utensils are used for cooking.

Which of the properties of metals is utilized in the following Instances? Aluminium utensils are used for cooking. Copper is used for making vessels. Gold wires are used in ornaments.

Bauxite and clay are minerals of aluminium. But bauxite is the only ore of Aluminium. Why?

Although thermodynamically feasible,in practice, magnesium metal is not used for the reduction of alumina in the metallurgy of aluminium.Why?

A farmer prepared 1% solution of copper sulphate using iron rod as the stirrer for preparing Bordeaux mixture. Next day he notices that the blue color almost disappeared and the iron get coated with reddish brown material. b) Account for the color change of the solution.

Two wires of equal length, one of copper and the other of aluminium have the same resistance. Which of the two wires is lighter? Hence explain why aluminium wires are prefered for overhead power cables. (P_(Al) = 2.63 xx 10^(-8) Omega m , P_(Cu) = 1.72 xx 10^(-8) Omega m , Relative density of Al = 2.7 , of Cu = 8.9.