Extraction of Non-metals from Ores
Chemistry ⇒ Metals and Non-metals
Extraction of Non-metals from Ores starts at 10 and continues till grade 12.
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Describe the main steps in the extraction of chlorine from brine.
Describe the process of extraction of sulphur by the Frasch process.
Describe the role of chlorine in the extraction of iodine from caliche ore.
Describe the steps involved in the extraction of iodine from caliche ore.
Explain why electrolysis is suitable for the extraction of chlorine from brine.
Explain why non-metals are generally not extracted by reduction with carbon.
Explain why the extraction of non-metals often requires different methods compared to metals.
Explain why the extraction of non-metals such as sulphur and phosphorus is important for industry.
In the extraction of chlorine from brine, which electrode is chlorine gas liberated at? (1) Cathode (2) Anode (3) Both electrodes (4) None of these
Which of the following is a by-product in the extraction of chlorine from brine? (1) Sodium hydroxide (2) Sulphur dioxide (3) Phosphoric acid (4) Nitric acid
Which of the following is a major ore of sulphur? (1) Galena (2) Gypsum (3) Pyrite (4) Bauxite
Which of the following is a step in the extraction of phosphorus from phosphate rock? (1) Roasting with air (2) Reduction with carbon (3) Electrolysis (4) Leaching with acid
During the extraction of non-metals, the process of ________ is used to separate volatile non-metals from their ores.
Fill in the blank: The main industrial method for obtaining nitrogen is ________ of liquid air.
Fill in the blank: The main industrial source of chlorine is ________.
Fill in the blank: The main source of nitrogen for industrial extraction is ________.
State whether the following statement is true or false: Iodine can be extracted from seaweed by sublimation.
State whether the following statement is true or false: Non-metals are generally found in nature in the free state.
State whether the following statement is true or false: Sulphur can be extracted from underground deposits using the Frasch process.
State whether the following statement is true or false: The extraction of non-metals from their ores always involves high temperatures.
