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प्रश्न
Gold and silver are active metals.
विकल्प
Right
Wrong
उत्तर
Gold and silver are active metals- Wrong
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संबंधित प्रश्न
Name two metals which are found in nature in the free state.
In the electrolytic refining of a metal M, what would you take as the anode, the cathode and the electrolyte?
Name two metals which are highly resistant to corrosion.
Name one metal which is extracted by reduction with carbon.
Give the name and chemical formula of one ore of copper.
Explain given equation, what happens when ZnCO3 is heated in the absence of air?
Which metal is extracted from cinnabar ore?
Which of the following reactants are used to carry out the thermite reaction required for welding the broken railway tracks?
(a) Al2O3 + Fe
(b) MnO2 + Al
(c) Fe2O3 + Al
(d) Cu2O + Fe
The metal which can be extracted simply by heating the cinnabar ore in air is:
(a) Zn
(b) Cu
(c) Al
(d) Hg
The articles made of silver metal become dark on prolonged exposure to air. This is due to the formation of a layer of its:
(a) oxide
(b) hydride
(c) sulphide
(d) carbonate
State three objectives achieved during the roasting of ores.
Give reasons, why aluminum is used in:
making alloys
Name the following:
The mixture of materials fed into a furnace to extract a metal.
Name:
The allotrope of the non-metal carbon which conducts electricity.
Define roasting.
Answer the following question:
Carbon cannot reduce the oxides of sodium, magnesium, and aluminum to their respective metals. Why? Where are these metals placed in the reactivity series? How are these metals obtained from their ores? Take an example to explain the process of extraction along with chemical equations.
Iron is _______.
_______ is the least reactive metal.
Find the odd one out and give its explanation.
A mineral from which the metal can be extracted economically and conveniently is known as ______.
