Which of the following metals should be electroplated on a tiffin box made of steel ?
(a) copper
(b) chromium
(c) silver
(d) tin

One of the following is not used for electroplating metal articles. This one is :
(a) nickel
(b) chromium
(c) sodium
(d) silver

During galvanisation, iron metal is given a thin coating of one of the following metals. This metal is:
(a) chromium (b) tin (c) zinc (d) copper

Which one of the following scrap metal cannot be separated by magnetic separation ?

(a) nickel (b) cobalt (c) chromium (d) steel