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प्रश्न
Gold and silver are active metals.
पर्याय
Right
Wrong
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उत्तर
Gold and silver are active metals- Wrong
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संबंधित प्रश्न
In the extraction of aluminium: Why is it necessary to replace anodes time to time?
Explain why, carbon cannot reduce oxides of sodium or magnesium.
Fill in the following blank with suitable word:
The rocky material found with ores is called.............
Explain giving one example, how highly reactive metals (which are high up in the reactivity series) are extracted.
Explain why, an aqueous solution of sodium chloride is not used for the electrolytic extraction of sodium metal.
What is the difference between a mineral and an ore?
Name one ore of sodium. Name the sodium compound present in this ore and write its chemical formula.
Give the name of one ore of iron. Which iron compound is present in this ore? Write its chemical formula.
Give reasons, why aluminum is used in:
In aluminiothermy
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
What is the function of cryolite used along with alumina as the electrolyte?
Define the term:
Flux
What is galvanized iron.
Heating an ore in a limited supply of air or in the absence of air at a temperature just below its melting point is known as ______.
Name the process used for the enrichment of sulphide ore.
Zinc sulphide : Roasting : : zinc carbonate : _______
Write the name.
The molecular formula of main ore of aluminium –
Write the molecular formulae of the following compound.
Cryolite
Write the molecular formulae of the following compound.
Sodium aluminate
Read the following passage and answer the questions.
According to the reactivity series, zinc is more reactive than iron, iron is more reactive than silver. During study of this, a student dipped the iron nails in silver nitrate solution.
- What is reactivity series?
- What will happen when iron nails are dipped in silver nitrate solution?
- Which type of reaction happens when iron metal reacts with silver nitrate solution?
- What will happen if a zinc rod is used instead of iron nail?
Give the reaction involved during extraction of zinc from its ore by
- roasting of zinc ore
- calcination of zinc ore
