Advertisements
Advertisements
प्रश्न
Explain concept with example/explain with the help of a balanced equation.
Calcination
उत्तर
- The process of heating carbonate ores in limited air to convert it into respective oxide is called calcination.
- For example, zinc carbonate is heated strongly in a limited supply of air to convert it to zinc oxide.
\[\ce{\underset{\text{Zinc carbonate}}{ZnCO_{3(s)}} ->[Heat] \underset{\text{Zinc oxide}}{ZnO_{(s)}} + \underset{\text{Carbon dioxide}}{CO_2\uparrow}}\]
APPEARS IN
संबंधित प्रश्न
Give reasons.
Carbonate and sulphide ores are usually converted into oxides during the process of extraction.
Write the steps involved in the extraction of pure metals in the middle of the activity series from their carbonate ores.
Which metal becomes black in the presence of hydrogen sulphide gas in air?
Define the term mineral.
Define the term ore.
Name the chemical compound which is electrolysed in molten state to obtain aluminium metal. Which gas is evolved during this process?
Name two metals which are found in nature mainly in the free state (as metallic elements).
An ore of manganese metal is:
(a) bauxite
(b) haematite
(c) cuprite
(d) pyrolusite
Which of the following reactants are used to carry out the thermite reaction required for welding the broken railway tracks?
(a) Al2O3 + Fe
(b) MnO2 + Al
(c) Fe2O3 + Al
(d) Cu2O + Fe
Which of the following metals can be obtained from haematite ore?
(a) copper
(b) sodium
(c) zinc
(d) iron
Manganese metal is extracted from manganese dioxide by a reduction process by making use of:
(a) carbon
(b) hydrogen
(c) electrolysis
(d) aluminium
Which metal can be extracted from the following ore?
Calamine
Complete the incomplete statement with missing word:
Non-metals form acidic oxides while metals form ______.
Choose the correct answer from the options given below:
The metal is a liquid at room temperature.
choose the most appropriate term to match the given description.
Heating of the ore in the absence of air to high temperature
State three objectives achieved during the roasting of ores.
Name the process used for the enrichment of sulphide ore.
Explain the following reaction with the balanced equation.
Dry aluminium hydroxide is ignited at 1000 °C
Give the reaction involved during extraction of zinc from its ore by
- roasting of zinc ore
- calcination of zinc ore
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Give a reason why Aluminium is preferably used in thermite reactions.
