Choose the correct statements from the following:
A) Calcination is defined as the process of converting ore into an oxide by heating it strongly either in presence of air or in a high supply.
B) Roasting is a process of converted ore into its oxide by heating it above its melting point in the absence of air.
C) Bauxite is an ore of Aluminium.
Important Questions on Matter and Its States
Which of the following is not an Isotope of Hydrogen?
Study the following statements about bronze:
I. It is an element like aluminium, iron and copper.
II. It is made by melting copper and tin in a furnace.
III. Tribal people have been using bronze since thousands of years.
IV. The objects made of bronze are lighter but much stronger than those made of aluminium.
The correct statements are:
Choose the correct statements from the following:
A) Miller Process is not used for the purification of Lead.
B) Wohlwill process is used for the refining of Gold.
C) Bessemer process was used for the production of steel from molten pig iron.
D) Calaverite and Sylvanite are ores of Zinc.
