What is corrosion of metals?

Important Questions on Minerals and Metals

EASY

Science>Chemistry>Minerals and Metals>Corrosion of Metals-causes and Solutions

 State two ways to prevent the rusting of iron.

EASY

Science>Chemistry>Minerals and Metals>Corrosion of Metals-causes and Solutions

Why do we apply paint on iron articles?

HARD

Science>Chemistry>Minerals and Metals>Corrosion of Metals-causes and Solutions

Which property of iron is modified in stainless steel? What is done to do so?

MEDIUM

Science>Chemistry>Minerals and Metals>Corrosion of Metals-causes and Solutions

Explain how painting of an iron gate prevents it from rusting.

HARD

Science>Chemistry>Minerals and Metals>Corrosion of Metals-causes and Solutions

Iron rusts, whereas stainless steel which contains large quantity of iron does not. Explain.

MEDIUM

Science>Chemistry>Minerals and Metals>Corrosion of Metals-causes and Solutions

Prevention of rusting of iron by coating it with zinc. (Greasing / Galvanisation)

MEDIUM

Science>Chemistry>Minerals and Metals>Corrosion of Metals-causes and Solutions

Which metal is used to galvanise iron to protect it from rusting?

EASY

Science>Chemistry>Minerals and Metals>Corrosion of Metals-causes and Solutions

What is the chemical symbol for iron ? 

EASY

Science>Chemistry>Minerals and Metals>Corrosion of Metals-causes and Solutions

_____________ plating is done on many objects such as car parts, bath taps, kitchen gas burners, bicycle handlebars, wheel rims and many others.

HARD

Science>Chemistry>Minerals and Metals>Corrosion of Metals-causes and Solutions

Describe tinning of iron sheets.

HARD

Science>Chemistry>Minerals and Metals>Corrosion of Metals-causes and Solutions

When a copper object is exposed to moist air for a long time, then a green coating is formed on its surface. What is the material of the green coating?

MEDIUM

Science>Chemistry>Minerals and Metals>Corrosion of Metals-causes and Solutions

A metal, when deposited on the surface of an iron object prevents its rusting. Identify the metal.

MEDIUM

Science>Chemistry>Minerals and Metals>Corrosion of Metals-causes and Solutions

Iron is usually galvanized with 

MEDIUM

Science>Chemistry>Minerals and Metals>Corrosion of Metals-causes and Solutions

When a copper object is exposed to moist air for a long time, then a green coating is formed on its surface. State whether the green coating is acidic or basic.

MEDIUM

Science>Chemistry>Minerals and Metals>Corrosion of Metals-causes and Solutions

Iron is galvanized by coating it with

EASY

Science>Chemistry>Minerals and Metals>Corrosion of Metals-causes and Solutions

A coating of __________ is deposited on iron in bridges and automobiles to provide strength.

HARD

Science>Chemistry>Minerals and Metals>Corrosion of Metals-causes and Solutions

Bathroom fittings are electroplated with _____ to prevent rusting. (iron/ chromium/ zinc)

HARD

Science>Chemistry>Minerals and Metals>Corrosion of Metals-causes and Solutions

A strip of impure copper metal is given to you. Describe briefly how you will purify it by using the chemical effect of electric current. Draw a labelled diagram of the experimental set up used for this purpose. 

HARD

Science>Chemistry>Minerals and Metals>Corrosion of Metals-causes and Solutions

Complete the following reaction:

$2\mathrm{C}\mathrm{u}+{\mathrm{H}}_2\mathrm{O}+\mathrm{C}{\mathrm{O}}_2+{\mathrm{O}}_2\mathrm{ }\to$

EASY

Science>Chemistry>Minerals and Metals>Corrosion of Metals-causes and Solutions

Which of these is not true about chromium?