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प्रश्न
_______ is the least reactive metal.
विकल्प
silver
sodium
zinc
gold
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उत्तर
Gold is the least reactive metal.
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संबंधित प्रश्न
How is copper extracted from its sulphide ore? Explain the various steps supported by chemical equations. Draw labelled diagram for the electrolytic refining of copper.
A zinc ore gave CO2 on treatment with a dilute acid. Identify the ore and write its chemical formula.
A zinc ore on heating in air forms sulphur dioxide. Describe briefly any two stages involved in the conversion of this concentrated ore into zinc metal.
What is meant by the 'concentration of ore'?
Name three other metals which are extracted in a manner similar to sodium.
Name the metal which is extracted from the ore called 'rock salt'.
The major ore of aluminium is known as:
(a) cinnabar
(b) calamine
(c) bauxite
(d) pyrolusite
Name a non- metal that has a metallic luster and sublimes on heating.
To protect iron from rusting, it is coated with a thin layer of zinc. Name the process.
Choose the correct answer from the options given below:
The metal is a liquid at room temperature.
Name the following :
The Process of heating an ore to a high temperature in the presence of air.
Name the process used for the enrichment of sulphide ore.
Answer the following question:
Carbon cannot reduce the oxides of sodium, magnesium, and aluminum to their respective metals. Why? Where are these metals placed in the reactivity series? How are these metals obtained from their ores? Take an example to explain the process of extraction along with chemical equations.
Extraction of moderately reactive elements is done by _______ and _______ method.
Mercury, silver, gold are highly reactive metals.
Explain the concept of Roasting.
Explain Bayer’s process.
Explain concept with example/explain with the help of a balanced equation.
Roasting
The poorest conductor of heat among metals is ____________.
Why should the metal sulphides and carbonates be converted to metal oxides in the process of extraction of metal from them?
