Name the following:i. The process of heating the sulphide ore to a hi

1.	Name the following:i. The process of heating the sulphide ore to a high temperature in the excess of air.ii. The process of heating the carbonate ore to a high temperature in limited air.iii. The compound formed by the reaction between aluminium oxide and sodium hydroxide.iv. Two metals which are found in the free state in nature.v. A metal which has the highest melting point.vi. Two nonmetals which are lustrous.
Answer» i. In roasting, sulphide ore is heated to a high temperature in the excess of air. ii. In calcination, carbonated ore is heated to a high temperature in limited air. iii. Sodium aluminate is formed by the reaction between aluminium oxide and sodium hydroxide. iv. Gold (Au) and silver (Ag) are found in the free state in nature. v. Tungsten has the highest melting point. vi. Iodine and diamond are lustrous in nature.

Name the following:i. The process of heating the sulphide ore to a high temperature in the excess of air.ii. The process of heating the carbonate ore to a high temperature in limited air.iii. The compound formed by the reaction between aluminium oxide and sodium hydroxide.iv. Two metals which are found in the free state in nature.v. A metal which has the highest melting point.vi. Two nonmetals which are lustrous.

Answer»

i. In roasting, sulphide ore is heated to a high temperature in the excess of air.

ii. In calcination, carbonated ore is heated to a high temperature in limited air.

iii. Sodium aluminate is formed by the reaction between aluminium oxide and sodium hydroxide.

iv. Gold (Au) and silver (Ag) are found in the free state in nature.

v. Tungsten has the highest melting point.

vi. Iodine and diamond are lustrous in nature.