Corrosion

Why Iron pillar of Qutub Minar in Delhi is not rusted?

Silver articles when exposed to air gradually turn blackish because they react with _____ to form silver sulphide.

An alloy of copper and tin is known as 

The surface of iron is coated with zinc metal, this process is called _____.

An iron ring is to be coated with zinc. Which method can we use for doing this?

Galvanisation is a process in which iron coating is applied to other metals.

Which of the following is not a method used for the prevention of corrosion?

Define electroplating. Why is it used?

Which method cannot prevent rusting?

Give reasons for the following statement:

Most metal objects are painted.

Give reasons for the following statement:

Iron objects are electroplated.

_____ is the process in which tin is plated on iron objects.

Rusting is an oxidation reaction. Why?

 When iron comes in contact with water, it forms rust which is a _____ coloured layer.

Which of the following element is mixed with iron to make it hard and strong?

A homogeneous mixture of two or more metals, or a metal and a non-metal is known as _____ .

In addition to iron, stainless steel contains________.

If one of the metals is mercury, then the alloy is known as _____.

Which component of air turns the silver articles black when exposed for a long time?

_____ is an alloy of lead and tin and is used for welding electrical wires together.