When calcium reacts with water the heat evolved is not sufficient for to catch fire.
Important Questions on Metals and Non-Metals
Rameshbhai said "when surface of any metal comes in contact with air, water, or humidity, corrosion will start". For this Divya, Darshana and Jigne gave certain statements.
Divya: When the paint is applied to the surface of iron, corrosion will start.
Darshana: In a test tube, iron is put in such a manner that half portion of iron sinks in water, then corrosion will start.
JIgne: When the surface of aluminium is kept open in the air, there will be no corrosion.
Give reason:
Metals like sodium and potassium are stored under oil.
Give reasons:
Aluminium is a highly reactive metal. Yet it is used to make utensils for cooking.
Explain, why copper reacts with moist carbon dioxide in the air and slowly loses its shiny brown surface and gains a green coat.
