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प्रश्न
Iron is _______.
विकल्प
more reactive than zinc
more reactive than aluminium
less reactive than copper
less reactive than aluminium
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उत्तर
Iron is less reactive than aluminium.
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संबंधित प्रश्न
What chemical process is used for obtaining a metal from its oxide?
In the extraction of aluminium: Write the function and formula of cryolite in the extraction of aluminium.
How many carats is pure gold? Why is pure gold not suitable for making ornaments?
Fill in the following blank with suitable word:
Bronze is an alloy of copper and .........
How is zinc extracted from its carbonate or (calamine)? Explain with equations.
Which gas is produced during the extraction of aluminium? At which electrode is this gas produced?
Describe the extraction of zinc metal from its sulphide ore (zinc blende). Write equations of the reactions involved.
An ore of manganese metal is:
(a) bauxite
(b) haematite
(c) cuprite
(d) pyrolusite
An important ore of zinc metal is:
(a) calamine
(b) cuprite
(c) pyrolusite
(d) haematite
The major ore of aluminium is known as:
(a) cinnabar
(b) calamine
(c) bauxite
(d) pyrolusite
Metals X and Y can be recovered from the anode mud left behind after the electrolytic refining of copper metal. The coins made of metal X look new even after several years of use but the coins made of metal Y lose their shine gradually and get blackened soon. When metal X is alloyed with a small amount of metal Y, it becomes hard and hence suitable for making ornaments. What are metals X and Y? Also state the colour of metal X.
Some metallic oxides can be reduced by hydrogen, carbon and carbon monoxide and some cannot. Explain.
What is meant by concentration of ores?
Name the following :
The Process of heating an ore to a high temperature in the presence of air.
The electrolysis of alumina involves the use of fluorspar and cryolite to increase the melting point.
Observe the following diagram and write answers.
- Name the method.
- Write anode reaction and cathode reaction.
- Why fluorspar and cryolite are added in the mixture?
The poorest conductor of heat among metals is ____________.
The process in which a carbonate ore is heated strongly in the absence of air to convert it into metal oxide is called ____________.
In extraction of copper, the flux used is ____________.
Electrical wires have a coating of an insulting material. The material, generally used is
