Advertisements
Advertisements
Question
The metal which can be extracted from pyrolusite ore is:
(a) mercury
(b) manganese
(c) aluminium
(d) magnesium
Solution
(b) manganese
Manganese is extracted from its oxide ore, pyrolusite. The name of the compound in the ore is manganese dioxide having chemical formula MnO2.
APPEARS IN
RELATED QUESTIONS
Silver metal does not combine easily with oxygen but silver jewellery tarnishes after some time. How?
How are the less reactive metals (which are quite low in the reactivity series) extracted? Explain with the help of an example.
Explain why, an aqueous solution of sodium chloride is not used for the electrolytic extraction of sodium metal.
How is sodium metal extracted? Explain with the help of equation of the reaction involved.
Rock salt is an ore of one of the following metals. This metal is:
(a) Mn
(b) Na
(c) Fe
(d) Cu
An element has its electron configuration as 2,8,8,2. Now answer the following questions.
a) What is the atomic number of this element?
b) What is the group of this element?
c) To which period does this element belong?
Give the chemical formula of :
Cryolite
Write the molecular formulae of the following compound.
Fluorspar
Explain Bayer’s process of concentration of bauxite with a chemical equation.
Which of the following metals exist in their native state in nature?
(i) Cu
(ii) Au
(iii) Zn
(iv) Ag