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प्रश्न
Name two metals which are found in nature in the free state.
उत्तर
The metals at the bottom of the reactivity series are mostly found in free state. For example: gold, silver, and platinum.
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संबंधित प्रश्न
Name one metal which is extracted by reduction with aluminium.
How is zinc extracted from its carbonate or (calamine)? Explain with equations.
Name two ores of zinc. Write the names of the chemical compounds present in them and give their chemical formulae.
Explain how, mercury is extracted from its sulphide ore (cinnabar). Give equations of the reactions involved.
Which of the following is an iron ore?
(a) cinnabar
(b) calamine
(c) haematite
(d) rock salt
The two metals which can be extracted just by heating their sulphides in air are:
(a) sodium and copper
(b) copper and aluminium
(c) potassium and zinc
(d) mercury and copper
Give reasons, why aluminum is used in:
In aluminiothermy
Aluminum is used in thermite welding:
write reaction for process?
Define the following term.
Gangue
Name a non- metal that has a metallic luster and sublimes on heating.
Which one of the following is not true of metal :
Metals are malleable and ductile
choose the most appropriate term to match the given description.
Heating of the ore in the absence of air to high temperature
What is the difference between calcination and roasting?
Write the name.
The molecular formula of main ore of aluminium –
Explain the following reaction with the balanced equation.
Chlorine dissolved in water
Explain the following reaction with the balanced equation.
Sodium aluminate reacts with water
Explain concept with example/explain with the help of a balanced equation.
Roasting
Explain concept with example/explain with the help of a balanced equation.
Calcination
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?
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.
