Extraction of Metals

Q.

Zone refining is a method to obtain:

1. Moderately pure metals

2. Ultrapure Al

3. Ultrapure metals

4. ultrapure oxides

Q. Name a metal which is found in nature in free state.

Q. Which one of the following sentence is incorrect about extraction of metals?
The extraction of metals from its ore depends on:

1. The type of ore being used
2. The location from where the ore is extracted
3. The degree of the reactivity of the metal that is to be extracted
4. The nature of impurities present in the ore

Q. Which of these can be used to extract a metal from its oxide?

1. More reactive metal
2. Carbon
3. Oxidizing agent
4. Reducing agent

Q. A list of metals which are arranged in order of their decreasing reactivity is known as:

1. Electrolytic refining
2. Roasting
3. Metallurgy
4. Activity series

Q.

Matter from which metals can be extracted...

1. Brine

2. Ore

3. Anode mud

4. Cathode deposit

Q. The metals extracted from their fused salts are :

1. sodium
2. potassium
3. magnesium
4. All of the above

Q. Metals are obtained economically from

1. Earth’s crust
2. Ores
3. Rocks
4. Minerals

Q.

The rusting of metals by contact and chemical union with oxygen in the damp atmosphere is known as:

1. sublimation
2. corrosion
3. oxidation
4. none of the above

Q. During refining impure metal by electrolysis, impure metal is used as ________ and pure metal is obtained at _________.

1. anode, cathode
2. cathode, cathode
3. anode, anode
4. cathode, anode