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प्रश्न
Which of the following pair of metals exists in their native state in nature?
(a) Ag and Hg
(b) Ag and Zn
(c) Au and Hg
(d) Au and Ag
उत्तर
(d) Au and Ag
Gold (Au) and silver (Ag) are highly non-reactive. Hence, they are available in native state in nature and do not react with oxygen or any other element in the atmosphere.
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संबंधित प्रश्न
Name the following:
The property possessed by metals by which they can be beaten into sheets.
Give the name and chemical formula of one ore of copper.
The major ore of aluminium is known as:
(a) cinnabar
(b) calamine
(c) bauxite
(d) pyrolusite
Which of the following metals can be obtained from haematite ore?
(a) copper
(b) sodium
(c) zinc
(d) iron
Define the following term.
Gangue
Name the following:
The process of heating a substance very strongly in such a way that it does not combine with oxygen.
How are metals refined by the electrolytic methods?
Explain the following:
Galvanization protects iron from rusting.
Explain the following reaction with the balanced equation.
Zinc carbonate is heated strongly in limited supply of air
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.
