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प्रश्न
Mercury, silver, gold are highly reactive metals.
पर्याय
Right
Wrong
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उत्तर
Mercury, silver, gold are highly reactive metals- Wrong
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संबंधित प्रश्न
Name one metal which is extracted by:
Reduction with heat alone.
Explain giving one example, how highly reactive metals (which are high up in the reactivity series) are extracted.
Define the term ore.
Explain giving equation, what happens when:
ZnCO3 is heated in the absence of air?
Name the gas produced when calamine ore is calcined.
How is aluminium metal extracted? Explain with the help of an equation.
The metal which is always present in an amalgam is ______.
A black metal oxide XO2 is used as a catalyst in the preparation of oxygen gas from potassium chlorate. The oxide XO2 is also used in ordinary dry cells. The metal oxide XO2 cannot be reduced satisfactorily with carbon to form metal X.
- Name the metal X.
- Name the metal oxide XO2.
- Which reducing agent can be used to reduce XO2 to obtain metal X?
- Name another metal which can also be extracted by the reduction of its oxide with the above reducing agent.
Aluminum is used in thermite welding:
what is thermit?
Name the following:
The mixture of materials fed into a furnace to extract a metal.
Name the following:
The process in which an ore is heated in air so that oxygen gets added to it to form the oxides.
Name the following:
Name two metals always find in combined state.
How are metals refined by the electrolytic methods?
Name the following:
The process of heating an ore to a high temperature in the presence of air.
State three objectives achieved during the roasting of ores.
If Cu, Fe, Zn, Al elements are arranged in increasing order of their reactivity then the correct order would be which of the following?
Sulphide ores : Roasting : : Carbonate ores : _______
Gold and silver are active metals.
Explain Bayer’s process of concentration of bauxite with a chemical equation.
Explain in brief electrolytic reduction of alumina with a neat labelled diagram.
