The correct statement(s) related to processes involved in the extraction of metals is(are)
The correct statement(s) related to processes involved in the extraction of metals is(are)
Roasting of Malachite produces Cuprite.
Calcination of Calamine produces Zincite
Copper pyrites is heated with silica in a reverberatory furnace to remove iron.
Impure silver is treated with aqueous KCN in the presence of oxygen followed by reduction with zinc metal.
The Correct Option is B, C, D
Approach Solution - 1
The processes involved in the extraction of metals require understanding the chemical reactions and treatments applied to the ores and impurities. Let's examine the statements provided:
1. Roasting of Malachite produces Cuprite.
This statement is incorrect. Roasting Malachite, which is basic copper carbonate, generally decomposes it to copper(II) oxide (CuO) and not Cuprite (Cu2O).
2. Calcination of Calamine produces Zincite.
This statement is correct. Calamine, primarily zinc carbonate (ZnCO3), undergoes calcination—a process of heating in absence of air—resulting in the formation of Zincite (ZnO) along with the release of carbon dioxide (CO2).
3. Copper pyrites is heated with silica in a reverberatory furnace to remove iron.
This statement is correct. When copper pyrites (CuFeS2) is heated with silica (SiO2), iron is removed as iron silicate (FeSiO3), aiding in copper extraction.
4. Impure silver is treated with aqueous KCN in the presence of oxygen followed by reduction with zinc metal.
This statement is correct. Impure silver is refined using the cyanide process, where it forms a soluble complex with cyanide ions in the presence of oxygen. Subsequent reduction by zinc metal results in pure silver.
In conclusion, statements 2, 3, and 4 are the correct processes related to metal extraction.
Approach Solution -2
Top Questions on Occurrence Of Metals
- Statement I: Along the period, the chemical reactivity of the element gradually increases from group 1 to group 18.
Statement II: The nature of oxides formed by group 1 element is basic while that of group 17 elements is acidic.
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As shown in the figures, a uniform rod $ OO' $ of length $ l $ is hinged at the point $ O $ and held in place vertically between two walls using two massless springs of the same spring constant. The springs are connected at the midpoint and at the top-end $ (O') $ of the rod, as shown in Fig. 1, and the rod is made to oscillate by a small angular displacement. The frequency of oscillation of the rod is $ f_1 $. On the other hand, if both the springs are connected at the midpoint of the rod, as shown in Fig. 2, and the rod is made to oscillate by a small angular displacement, then the frequency of oscillation is $ f_2 $. Ignoring gravity and assuming motion only in the plane of the diagram, the value of $\frac{f_1}{f_2}$ is:
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Concepts Used:
Occurrence of metals
The existence of metals often plays an important role in our survival, even if we are unaware of them. Our reliance on metals has been strong since the old industrial era. From buildings to jewelry, we utilize them for everything. But where do we acquire these metals from and how are they made? Let's read the occurrence of metal in more detail.
Metals are found in the earth's crust, and it seems to be a good place to extract them through various processes such as metallurgy. The process of extracting metals from ores is called metallurgy. Mining is the most common method of extracting metals from the earth.
In nature, metals are mostly found in mixed conditions. However, they can also be found in a free state. In its natural state, a native metal is one that can be found in its pure form or as part of an alloy. Most metals are exposed to natural processes such as oxidation and corrosion. As a result, only non-reactive metals such as gold, silver, platinum, and others are discovered in their native or open-free condition. Most metals are obtained as compounds, which must be filtered to remove contaminants before being employed in numerous applications.