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प्रश्न
Zinc sulphide : Roasting : : zinc carbonate : _______
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उत्तर
Zinc sulphide : Roasting : : zinc carbonate : calcination
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संबंधित प्रश्न
In the extraction of aluminium: Name the process of concentration of bauxite.
Explain why, carbon cannot reduce oxides of sodium or magnesium.
Explain giving one example, how highly reactive metals (which are high up in the 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 the electrode at which aluminium metal is produced.
Name one ore of mercury. Which mercury compound is present in this ore? Write its chemical formula.
Calamine ore can be converted into zinc oxide by the process of:
(a) dehydration
(b) roasting
(c) calcination
(d) sulphonation
Define the following term.
Mineral
Correct the following statement :
Copper reacts with nitric acid to produce nitrogen dioxide.
Find the odd one out and give its explanation.
Write the name.
Metals which are amphoteric in nature.
Write the molecular formulae of the following compound.
Cryolite
Explain concept with example/explain with the help of a balanced equation.
Roasting
Complete flow chart given below.
Oxides of moderately reactive metals like Zinc, Iron, Nickel, Tin, Copper, etc. are reduced by using:
In thermite welding a mixture of ____________ is ignited with a burning magnesium ribbon which produces molten iron metal as a large amount of heat is evolved.
In extraction of copper, the flux used is ____________.
Iqbal treated a lustrous, divalent element M with sodium hydroxide. He observed the formation of bubbles in reaction mixture. He made the same observations when this element was treated with hydrochloric acid. Suggest how can he identify the produced gas. Write chemical equations for both the reactions.
Two ores A and B were taken. On heating ore A gives CO2 whereas, ore B gives SO2. What steps will you take to convert them into metals?
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 the reason why the above reaction is known as a thermite reaction.
