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प्रश्न
Mercury, silver, gold are highly reactive metals.
पर्याय
Right
Wrong
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उत्तर
Mercury, silver, gold are highly reactive metals- Wrong
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संबंधित प्रश्न
Name two metals which occur in nature in free state as well as in combined state.
How are the less reactive metals (which are quite low in the reactivity series) extracted? Explain with the help of an example.
How is sodium metal extracted? Explain with the help of equation of the reaction involved.
Give the name of one ore of iron. Which iron compound is present in this ore? Write its chemical formula.
An important ore of zinc metal is:
(a) calamine
(b) cuprite
(c) pyrolusite
(d) haematite
Which of the following is an ore of mercury metal?
(a) rock salt
(b) cinnabar
(c) calamine
(d) haematite
Which of the following metals can be obtained from haematite ore?
(a) copper
(b) sodium
(c) zinc
(d) iron
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
The metal which can be extracted from pyrolusite ore is:
(a) mercury
(b) manganese
(c) aluminium
(d) magnesium
Some metallic oxides can be reduced by hydrogen, carbon and carbon monoxide and some cannot. Explain.
Give the chemical formula of :
Bauxite
How are metals refined by the electrolytic methods?
How many valence electrons are present in metals ?
Arrange the metals of copper, iron, magnesium, sodium and zinc in the decreasing order of reactivity.
Name the process used for the enrichment of sulphide ore.
Which of the following ore is concentrated by the Froth floatation process?
An alloy is
Give the reaction involved during extraction of zinc from its ore by
- roasting of zinc ore
- calcination of zinc ore
