Which of the following is a non-metallic mineral?
Limestone
Lead
Tin
Copper
Brass is an alloy of :
(a) Copper and tin, (b) Copper and zinc,
(c) Zinc and lead, (d) Lead and tin.
A metal less reactive and another metal more reactive than hydrogen are (a) aluminium and lead (b) iron and magnesium
(c) copper and tin (d) copper and mercury
Out of aluminium, copper calcium and tin, the most reactive metal is : (a) aluminium (b) copper (c) tin (d) calcium
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 of the following metals should be electroplated on a tiffin box made of steel ? (a) copper (b) chromium (c) silver (d) tin