Chemistry - Study Mode
[#561] The manufacturing of iron from iron ore involves the process of
Correct Answer
(B) Reduction
[#562] The important ore of aluminium is
Correct Answer
(A) Bauxite
Explanation
Solution: Bauxite is best defined as an aluminum ore of varying degrees of purity in which aluminum in the form of aluminum hydroxide or aluminum oxide is the largest single constituent.
[#563] Which of the following elements is not present in stainless steel?
Correct Answer
(B) Tungsten
Explanation
Solution: Tungsten is not present in stainless steel.
[#564] Which one of the following minerals is found in pure form?
Correct Answer
(B) Copper
Explanation
Solution: Copper is one of very few elements that are found in essentially pure form in nature. But the bulk of the copper resource is found in other minerals.
[#565] What is the principal ore of aluminium ?
Correct Answer
(D) Bauxite
Explanation
Solution: Bauxite is an aluminium ore and is the main source of aluminium. This form of rock consists mostly of the minerals gibbsite ,boehmite , and diaspore , in a mixture with the two iron oxides goethite and hematite, the clay mineral kaolinite, and small amounts of anatase TiO 2 . Bauxite was named after the village Les Baux in southern France, where it was first recognised as containing aluminium and named by the French geologist Pierre Berthier in 1821. Lateritic bauxites (silicate bauxites) are distinguished from karst bauxite ores (carbonate bauxites). The early discovered carbonate bauxites occur predominantly in Europe and Jamaica above carbonate rocks (limestone and dolomite), where they were formed by lateritic weathering and residual accumulation of intercalated clays or by clay dissolution residues of the limestone.