Advertisements
Advertisements
प्रश्न
Rusting of an article made up of iron is called
पर्याय
corrosion and it is a physical as well as chemical change
dissolution and it is a physical change
corrosion and it is a chemical change
dissolution and it is a chemical change
Advertisements
उत्तर
corrosion and it is a chemical change
Explanation:
Rusting of an article made up of iron is called corrosion. Corrosion is a chemical change because rust is a chemical compound (hydrated iron oxide, Fe2O3 - H2O) which is totally different from element iron (Fe).
APPEARS IN
संबंधित प्रश्न
The molecules can move freely anywhere in
Name the processes involved in two cases.
Which one is a kind of matter:
Describe in your own words, what happens to the particles when salt dissolves in water.
What is the other name for impure substances ? Give two examples of impure substances.
State two physical properties on the basis of which metals can be distinguished from non-metals.
There are three substances X, Y and Z. The substance X does not have a fixed melting point or boiling point and it still shows the individual properties of its constituents. The substance Y is a pure substance which occurs in nature as such. The substance Y has a fixed melting point and boiling point but it cannot be broken down into simpler substances by any chemical means. The substance Z is also a pure substance whose properties are entirely different from those of its constituents. The substance Z can, however, be divided by electrolysis into two substances which belong to the same class of substances as Y.
- What type of substance could X be ? Name one substance like X.
- What type of substance could Y be ? Name one substance like Y.
- What type of substance could Z be ? Name one substance like Z.
- Which process involves absorption or release of an appreciable amount of energy : formation of substance X or formation of substance Z ?
- Name the three groups into which all the substances like Y are divided on the basis of their properties.
How would you obtain sodium chloride from a mixture of sodium chloride and sulphur without using water ?
Naphthalene can be separated from sand :
The boiling point of liquid argon is :
One of the following does not undergo sublimation. This one is :
Matter is made up of ______.
Define the term matter.
A standard sheet of paper is about ______ of atoms thick
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal which exists as a liquid at room temperature.
______ is so hard that it can scratch glass.
Liquids cannot be compressed and they have fixed volume.
Liquids have ______.
Gases do not diffuse very easily.
Evaporation is always accompanied by ______ in temperature.
