Science Write True or False

Corrosion is degradation of a reaction with its environment.

copper reacts with moist carbon form copper carbonate.

Aluminium oxide is an acidic oxide.

silver amalgam is mainly used by dentists.

Silver plated spoon, gold plated ornaments are the examples of alloying.

In anodising method. the copper or aluminium article is used as anode.

In electroplating a metal is coated with another metal using electrolysis.

Mercury, silver and gold are very reactive metals.

Ionic compounds in the solid state conduct electricity.

Ionic compounds are soluble in kerosene.

Due to corrosion a greenish layer forms on the surface of copper or brass vessel.

Corrosion of metals can be stopped by detaching the air from metals.

Iodine and diamond are lustrous substances.

Electrolysis method is used to obtain pure metals from impure metals.

Diamond is the softest natural substance.

Metals are known as sonar metals.

Alloys are resistant to corrosion.

Ionic compounds have low melting points.

Iodine is a lustrous metal.

The process of converting sulphide ores into oxides by heating strongly in excess of air is called Calcination.

Electrolysis is the method used to obtain pure metals from impure metals.

Electronic configuration of Aluminium is 2,8,2.

The reactivity of metals increase down to reactivity series.

The process of separating gangue from the ores is called concentration of ores.

Ore contains some impurities, these are called gangue.

The minerals from which the metal can be separated economically are called ores.

Non-metals combine with oxygen to form basic oxides.

Metallic iron is more reactive than metallic copper.

Metals gain electrons and become negatively charged ions.

Non - metals are good conductors of heat and electricity.

Alloys are resistant to corrosion.

Ionic compounds have low melting points.

The elements or compounds which occur naturally is earth's crust are known as minerals.

Non - metals react with acids to give a salt and hydrogen gas.

Nitric acid is a strong oxidizing agent.

In the process of 'Kalhaee' a metal is coated with Zinc to prevent its corrosion.

If one of the metals in an alloy is mercury then it is known as Amalgam.