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प्रश्न
Write the name.
Metals which are amphoteric in nature.
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उत्तर
Metals which are amphoteric in nature- Aluminium (Al), zinc (Zn)
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संबंधित प्रश्न
How many carats is pure gold? Why is pure gold not suitable for making ornaments?
Why are the metals like Na, K, Ca and Mg never found in their free state in nature?
Describe with one example, how moderately reactive metals (which are in the middle of reactivity series) are extracted.
Name the chemical compound which is electrolysed in molten state to obtain aluminium metal. Which gas is evolved during this process?
Name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula.
Name the metal which is extracted from the ore called 'rock salt'.
Zinc blende ore can be converted into zinc oxide by the process of:
(a) roasting
(b) hydrogenation
(c) chlorination
(d) calcination
State three objectives achieved during the roasting of ores.
Give reasons, why aluminum is used in:
In aluminiothermy
Calcium, copper, lead, aluminium, zinc, chromium, magnesium, iron.
Choose the major metals from the list given above to make the following alloys:
(a) Stainless steel
(b) brass
Name the methods by which concentrated ore is converted to metallic oxide.
Name the process used for the enrichment of sulphide ore.
Draw a well-labelled diagram of extraction of Aluminium. Write the anode reaction in electrolytic reduction of Alumina.
Find the odd one out and give its explanation.
Write the name.
The molecular formula of main ore of aluminium –
Write the name.
The process of strong heating of carbonate ores in insufficient air–
Explain concept with example/explain with the help of a balanced equation.
Ionic bond and ionic compounds
Which of the following metals exist in their native state in nature?
- Cu
- Au
- Zn
- Ag
Why should the metal sulphides and carbonates be converted to metal oxides in the process of extraction of metal from them?
Give the reaction involved during extraction of zinc from its ore by
- roasting of zinc ore
- calcination of zinc ore
