Extraction of Low Reactive Metals

Q. The metal which can be extracted simply by heating the cinnabar ore is:

1. $Zn$
2. $Cu$
3. $Al$
4. $Hg$

Q.

The process of heating an ore to a high temperature in the presence of air.

Q. The oxides of which of the following ores can be reduced by just heating?

1. Haematite
2. Magnetite
3. Cinnabar
4. Calamine

Q.

Name the following

A metal that occurs in the native state.

Q. Which of the following metals are available in the free state in nature?

1. Gold
2. Zinc
3. Iron
4. Sodium

Q. The oxides of which of the following ores can be reduced by just heating?

1. Haematite
2. Magnetite
3. Cinnabar
4. Calamine

Q. Which among the following metals are least reactive in nature?

1. Gold
2. Silver
3. Copper
4. Lead
5. Mercury
6. Sodium
7. Potassium
8. Calcium

Q. The impurities present in mined ores are technically calledand the process of removing them from the ore is calledof an ore.

1. gangue
2. flux
3. concentration
4. metallurgy

Q. Identify the reaction in which a low reactive metal is replaced by a high reactive metal.

1. Corrosion
2. Redox
3. Displacement
4. Combination

Q. Some low reactive metals exists as sulphide ores too.

1. True
2. False

Q. ______ is a process of heating the concentrated ore at the temperature below its melting point in the presence of air.

1. Calcination
2. Roasting
3. Electrolysis
4. Leaching

Q. Which among the following metals are available in free state in nature?

1. Gold
2. Iron
3. Zinc
4. Sodium

Q. The oxides of metals which are least reactive can be reduced to their respective metals by simple heating.

1. True
2. False

Q.

Cinnabar is an ore of ____.

1. mercury
2. copper
3. lead
4. calcium

Q. The metals that are found in free state are generally present _______ of the activity series.

1. at the top
2. at the bottom
3. in the middle
4. above hydrogen