Doubtly
@Doubtly · Joined Feb 2021
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- Draw a neat labelled diagram Froth floatation method. labelled diagram 1
- Draw a neat labelled diagram Magnetic separation method labelled diagram 1
- The electronic configuration of metal ‘A’ is 2,8,1 and that of metal ‘B’ is 2,8,2. 1) moving from left to right in a period of periodic table, the chemical reactivity of elements first decreases from sodium to silicon and t... 2
- When a copper coin is dipped in silver nitrate solution, a glitter appears on the coin after some time. Copper is more reactive than silver. Hence displacement reaction occurs. When copper coin is dipped in silver nitrate solution forming coppe... 1
- Anodes need to be replaced from time to time during the electrolysis of alumina. Anodes needs to be replaced during the electrolysis of the Alumina because they gets oxidized. During the Electrolysis of the Alumina, Oxyge... 1
- Pine oil is used in froth flotation. Answer: Pine oil is used in froth flotation because the ore particles are preferentially wetted by oil, while the gangue (impurities) is wet... 1
- Sodium is always kept in kerosene. Sodium are very reactive metals and kept in kerosene oil to prevent it from coming in contact with oxygen and moisture as they react to form... 1
- Generally the ionic compounds have high melting points. Ionic compounds are mostly solids and are packed in a crystal lattice structure . They have strong electrovalent bonds between the constitue... 1
- Lemon or tamarind is used for cleaning copper vessels turned greenish. Copper reacts with carbon dioxide in the air to form copper carbonate. As a result, copper loses its shiny brown surface forming a green lay... 1
- Explain the term Gangue The impurities present in the one such as sand , rocks etc are known as gangue. 2
- Explain the term Minerals The compounds of metals that occur in nature along with the impurities are called minerals. minerals are the natural source in which the met... 1
- Explain the term Ores metals are commercially extracted from minerals at low cost and minimum efforts .These minerals are called ores. ores are raw materials for... 1
- Metallurgy Explain the terms. Metallurgy defined as extraction of metal from their pure form. metals are commercially extracted from minerals at low cost and minimum effo... 2
- Identify the pairs of metals and their ores from the following. Group A. Group B A. Bauxite. 1. Aluminium B. Cassiterite. 2.Tin c. Cinnabar. 3. Mercury 1
- Make pairs of substances and their properties Substance. Property A. Potassium bromide. 1.Combustible Substance. Property A.Potassium bromide 1. Soluble in water b. Gold. 2. High ductility. C.Sulphur. 3. Combustible. D. Neon. 4. No chemical r... 1
- Write names. a. Alloy of sodium with mercury. b. Molecular formula of the common ore of aluminum. a. Alloy of sodium with mercury. Answer:: Sodium amalgam, commonly denoted Na(Hg), is an alloy of mercury and sodium. b. Molecular formula o... 1
- Make a Power point presentation about the construction and use of binoculars. Binoculars are an important device. A PowerPoint presentation on it can be made with 3-4 slides. The first slide will talk about how binocul... 1
- An object kept 60 cm from a lens gives a virtual image 20 cm in front of the lens. Answer: focal length = −30 cm; it is a diverging (concave) lens. Using the Cartesian sign convention, the object is on the left: u = -60 cm.... 1