A metal 'X' acquires a green colour coating on its surface on exposure to air.
(i) Identify the metal 'X' and name the process responsible for this change.
(iii) List two important methods to prevent the process.

A metal 'P' when exposed to moist air for longer period of times, loses its shining brown surface and gains green coating, what has happened ? Identify the metal, write the name and chemical formula of green coloured compound. List two ways to prevent this process.

(i) What is corrosion of metals ? (ii) Name a metal which does not corrode. (iii) Give two methods to prevent corrosion of metals.

A metal X present in rock salt is highly reactive and it is stored under kerosene to prevent it from catching fire. It exists in nature as XCI. Identify the metal 'X'. How can this metal be extracted from its Chloride ore, Write chemical equations to explain your answer? How is calcination different from roasting?

A metal E is stored under kerosene. When a small piece of it is left open in air, it catches fire. When the product formed is dissolved in water, it turns red litmus to blue : (i) Name the metal E. (ii) Write the chemical equation for the reaction when it is exposed to air and when the product is dissolved in water. (iii) Explain the process by which the metal E is obtained from its molten chloride

A metal E is stored under kerosene. When a small piece of it is left open in air, it catches fire. When the product formed is dissolved in water, it turns red litmus to blue : (i) Name the metal E. (ii) Write the chemical equation for the reaction when it is exposed to air and when the product is dissolved in water. (iii) Explain the process by which the metal E is obtained from its molten chloride.