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प्रश्न
Mercury, silver, gold are highly reactive metals.
पर्याय
Right
Wrong
उत्तर
Mercury, silver, gold are highly reactive metals- Wrong
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संबंधित प्रश्न
In the extraction of aluminium: Draw the diagram for the extraction of aluminium.
A zinc ore gave CO2 on treatment with a dilute acid. Identify the ore and write its chemical formula.
An important ore of zinc metal is:
(a) calamine
(b) cuprite
(c) pyrolusite
(d) haematite
Calamine ore can be used to extract one of the following metals. This metal is:
(a) copper
(b) mercury
(c) aluminium
(d) zinc
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
Define the following term.
Gangue
Give the chemical formula of :
Cryolite
Name the following:
Name two metals always find in combined state.
How are metals refined by the electrolytic methods?
Which method of refining is used to get 99.8% pure aluminium?
Name : The metal which is liquid at room temperature.
To protect iron from rusting, it is coated with a thin layer of zinc. Name the process.
Correct the following statement :
Copper reacts with nitric acid to produce nitrogen dioxide.
Which one of the following is not true of metal :
Metals are malleable and ductile
Froth floatation process is generally used to concentrate ______ ores.
If Cu, Fe, Zn, Al elements are arranged in increasing order of their reactivity then the correct order would be which of the following?
Write the name.
Metals which are amphoteric in nature.
Write the molecular formulae of the following compound.
Sodium aluminate
Explain the following reaction with the balanced equation.
Zinc sulphide is heated strongly in excess of air
Explain in brief types of extraction of highly reactive metals according to their reactivity.
