Zinc sulphide is note reduced by self reduction/autoreduction process because self reduction process is used for the sulphide ores of less electropositive elements like Hg, Pb, and Cu that are heated in air as to convert part of the ore into oxide or sulphate which then reacts with the remaining sulphide ore to give the metal and sulphur dioxide . So,ZnS and Ag2s is not converted by this process .
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Metals more reactive than carbon, such as aluminium, are extracted by electrolysis, while metals less reactive than carbon, such as iron, may be extracted by reduction with carbon. As gold is so unreactive, it is found as the native metal and not as a compound. It does not need to be chemically separated.
3:On adding a calculated quantity of concentrated sulphuric acid to a hot concentrated solution of borax, boric acid is produced. On heating borax with ethyl alcohol and concentrated sulphuric acid , vapours of triethylborates are produced. When ignited these vapours burn with a green edged flame .
4:=> When Mg reacts with dil. HNO3 then the Magnesium nitrate formed and hydrogen gas liberate.
=> Mg + HNO3 > Mg(HNO3)2 + H2
Explanation:please mark me as brainliest
copper, lead and mercury are all less electropositive metals and so they can be extracted by self-reduction from their respective sulphide ores. In the extraction of copper from its sulphide ore, the ore is subject to partial roasting in air to from its oxide.
1.. very reactive metal sodium , potassium
2.Copper , lead
3Borax is the salt resulting from neutralisation of boric acid with sodium hydroxide so addition of an acid just reverts the salt back to boric acid.
Na2B4O7 + H2SO4 + 5H2O = 4H3BO3 + Na2SO4
4. ek forms magnesium oxide in hydrogen gas is evolved.
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In self reduction, the sulphide ores of less electropositive metals are heated in air so as to convert a part of the ore into oxide or sulphate which then reacts with the remaining part of the sulphide ore in absence of air to give the metal and sulphur dioxide.
metals which are less electro positive
answer:What is self reduction process?
The principle ore of copper is copper pyrite and copper is extracted from this ore. During this process no external reducing agent is used so it is an example of self reduction. Self-reduction happens in Bessemer converter reaction as. 2FeS+3O2→2FeO+2SO2.Which of the following pair of metals are extracted by self reduction?
Self-reduction is also known as the auto reduction process or air reduction process. The sulphide ores of less electropositive metals like Mercury (Hg), Lead (Pb), Copper (Cu), etc. are heated in the air, so a part of the oxide ore converts into sulphate.
Explanation:Hope it helps you!
Carbon reduction process. ... Carbon is usually used in the form of coke, or carbon monoxide. Not all metallic oxides can be reduced by carbon or carbon monoxide. Thus, in order to extract metal from its ore the method adopted depends on the reactivity of the metal i.e., its position in the metal activity series.
Self-Reduction Process. The cations of the less electropositive metals like Pb, Hg, Sb and Cu may be reduced without the use of any additional reducing agent. ... For example, in the extraction of mercury, the sulphide ore (cinnabar) is heated in a current of air when the following reactions take placehope this helps u..
electropositive metals like Hg, Pb, Cu etc., are heated in air as to convert part of the ore into oxide or sulphate which then reacts with the remaining sulphide ore to give the metal and sulphur dioxide.
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