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प्रश्न
Name two metals which occur in nature in free state as well as in combined state.
उत्तर
Copper and silver metals occur in nature in free as well as combined state.
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संबंधित प्रश्न
A man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was upset, but after a futile argument, the man beat a hasty retreat. Can you play the detective to find out the nature of the solution he had used?
Write the composition of the alloy called bronze.
Which metal can be extracted from the following ore?
Haematite
State why aluminium is extracted from its oxide by electrolysis while copper, lead, iron by reducing agents and mercury and silver by thermal decomposition.
Which one of the following is not true of metal :
Metals form non-polar covalent compounds
Answer the following question :
What is the difference between calcination and roasting.
Atomic number of aluminium is _______ and its electronic configuration is _______.
In the electrolytic method, a layer of highly active metal is applied to a less active metal.
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Identify the substance oxidised and reduced in the above reaction.
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.
