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प्रश्न
Find the odd one out and give its explanation.
पर्याय
Na
K
Cu
Li
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उत्तर
Cu
Explanation-
Copper (Cu) is a less reactive metal while others are highly reactive metals.
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संबंधित प्रश्न
What chemical process is used for obtaining a metal from its oxide?
How is manganese extracted from manganese dioxide, MnO2? Explain with the help of an equation.
Name one ore of copper (other than cuprite). Which compound of copper is present in this ore? Also, write its chemical formula.
Name the chemical compound which is electrolysed in molten state to obtain sodium metal. Which gas is produced in this process?
Which gas is produced during the extraction of aluminium? At which electrode is this gas produced?
An important ore of zinc metal is:
(a) calamine
(b) cuprite
(c) pyrolusite
(d) haematite
Which of the following metals are extracted by the electrolysis of their molten chlorides?
(a) Na and Hg
(b) Hg and Mg
(c) Na and Mg
(d) Cu and Fe
A metal which exists as a liquid at room temperature is obtained by heating its sulphide ore in the presence of air.
(a) Name the metal and write its chemical symbol.
(b) Write the name and formula of the sulphide ore.
(c) Give the equations of chemical reactions involved in the production of metal from its sulphide ore.
(d) Name a common device in which this metal is used.
(e) Can this metal displace copper from copper sulphate solution? Why?
Name the following:
The process in which an ore is heated in air so that oxygen gets added to it to form the oxides.
How are metals refined by the electrolytic methods?
Complete the incomplete statement with missing word:
Metals form positive ions while non- metals ______.
How many valence electrons are present in non- metals?
_______ is the least reactive metal.
Write the name.
The process of extraction of aluminium from alumina-
Explain concept with example/explain with the help of a balanced equation.
Calcination
Explain in brief electrolytic reduction of alumina with a neat labelled diagram.
Explain the difference between Bayer’s process and Hall’s process by explaining the Bayer’s process.
Oxides of moderately reactive metals like Zinc, Iron, Nickel, Tin, Copper, etc. are reduced by using:
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.
