Advertisements
Advertisements
प्रश्न
Explain concept with example/explain with the help of a balanced equation.
Calcination
Advertisements
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
Silver metal does not combine easily with oxygen but silver jewellery tarnishes after some time. How?
Why do gold ornaments look new even after several years of use?
Name two metals which occur in nature in free state as well as in combined state.
Name two metals which are found in nature mainly in the free state (as metallic elements).
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
Give reasons, why aluminum is used in:
In aluminiothermy
Give reasons, why aluminum is used in:
In making ships
Define the term:
Flux
Write equations for each of the above metal which reacts with water.
Complete the incomplete statement with missing word:
Metals are malleable while non-metals are ______.
Which one of the following is not true of metal :
Metals are good conductors of electricity.
_______ is the least reactive metal.
Find the odd one out and give its explanation.
Write the name.
Metals which are amphoteric in nature.
Explain Bayer’s process.
Explain concept with example/explain with the help of a balanced equation.
Roasting
Observe the following diagram and write answers.
- Name the method.
- Write anode reaction and cathode reaction.
- Why fluorspar and cryolite are added in the mixture?
Observe the figure and answer the following.
- Write the name of the method.
- What is used as anode and cathode in this method?
- Write the molecular formula and use of cryolite.
- Write anode reaction.
- Write cathode reaction.
Which of the following ore is concentrated by the Froth floatation process?
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.
