Overview of General Metallurgical Processes

Q.

Distinguish between flux and slag.

Q. Define slag

Q.

Explain the following terms:

(a) flux, (b)gangue,

(c) slag, (d) smelting.

Q.

(a) What are acidic and basic flux?

(b) Why does iron or zinc not occur free in nature?

Q.

Borax Bead Test is responded by ________.

Q. Addition Reaction of Ethene with Hydrogen "In presence of finely divided platinum or palladium or Raney nickel, the reaction takes place at room temperature. In presence of nickel catalyst, the reaction takes place at 200-300°C." Does this mean : If we use nickel catalyst and we provide a temperature of 200-300°C then the reaction will take place. But if we use finely divided platinum or palladium or Raney nickel, the reaction would take place at room temperature, that is, no extra amount of heat needs to be given. Thus, it is more convenient to use finely divided platinum or palladium or Raney nickel than Nickel+extra heat. But why is Ni generally mentioned to be more convenient?

Q. The process of heating an ore in the absence of air below its melting point is known as _________.

1. smelting
2. poling
3. calcination
4. roasting

Q. Formula of ruby copper is :

1. $C{u}_{2}O$
2. $C{u}_{2}S$
3. $CuC{O}_3.Cu(OH{)}_2$
4. $CuFe{S}_2$

Q.

Use of water to extract metal from ore is called hydrometallurgy.

1. True

2. False

Q. Roasting as well as calcination of an ore is always doneits melting point.

1. above
2. below
3. at

Q.

Use of heat for generating metallurgical changes in compounds is called ___ .

Q. Which of the following is a carbonate ore of copper?

1. Copper glance
2. Pyrite
3. Cuprite
4. Malachite

Q. Sulphide ores are calcinated to obtain the respective metal oxide.

1. True
2. False

Q. Roasting as well as calcination of an ore is always doneits melting point.

1. above
2. below
3. at

Q. Fill in the blanks with the correct option.

1. ____________ is an example of a carbonate mineral of iron. (Iron pyrite/Siderite)

2. The method used for extraction of a metal from its
ore depends on the ____________ of the metal. (solubility/reactivity)

3. During electrolysis of NaCl, chlorine gas is obtained
at the ___________. (anode/cathode)