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प्रश्न
Gold and silver are active metals.
विकल्प
Right
Wrong
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उत्तर
Gold and silver are active metals- Wrong
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संबंधित प्रश्न
Give one word or a phrase:
The process by which sulphide ore is concentrated.
Which metal becomes black in the presence of hydrogen sulphide gas in air?
Name one metal which is extracted by:
Electrolytic reduction.
Explain why, an aqueous solution of sodium chloride is not used for the electrolytic extraction of sodium metal.
Name the gas produced when calamine ore is calcined.
An important ore of zinc metal is ______.
Which of the following pair of metals exists in their native state in nature?
Which of the following reactants are used to carry out the thermite reaction required for welding the broken railway tracks?
During galvanisation, iron metal is given a thin coating of one of the following metals. This metal is:
Rock salt is an ore of one of the following metals. This metal is:
A sulphide ore is converted into metal oxide by the process of ______.
Give the principles of electromagnetic separation.
Explain the following:
Galvanization protects iron from rusting.
Name : The metal which is liquid at room temperature.
Name the following:
The process of heating an ore to a high temperature in the presence of air.
Froth floatation process is generally used to concentrate ______ ores.
Find the odd one out and give its explanation.
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?
Explain in brief electrolytic reduction of alumina with a neat labelled diagram.
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.
