why silver is used in making mirrors class 8

Protected Silver. Hall, Nice Information with brief explanation - expecting still more info thru mail in future ...if possible kindly add our mail for newsletter. Can a wire be drawn out of wood? Answer: Cover the tumbler with a lid to ensure that the gas produced does not escape. Your email address will not be published. 3. Hydrogen sulphide. 3. Most common is Merrill-Crowe precipitation, which uses fine zinc dust to Answer: Hydrogen, oxygen, carbon, sulphur, phosphorus, etc. Discuss why it is necessary to anodize aluminum to make it corrosion resistant. Question 8. (c) Sulphur Identify the metals and non-metals from A, B, C and D. (b) A metal that displaces silver from silver nitrate solution. Question 6. The process developed into its present (d) Metals react with acids to produce ______ gas. Metallurgy is the science of extracting metals from their ores and purifying them for various uses. Iron is a strong metal, therefore, it is mixed with concrete to make bridges and houses. Answer: (iii) Anodizing of aluminium: Anodizing process consists of passing an electric current through sulphuric acid using aluminium as anode. Question 21. Distinguish between metals and non-metals on the basis of these properties. Ask your question. Solution: Which metals will react with cold water ? (a) How will she find the nature of the gas? Answer: Activity 1 (NCERT Textbook, Page 44) (d) carbon List different uses of metals that you come across in everyday life. Copper. Answer: process is used. for the chemical process industry. The metallic oxide formed would be acidic or basic in nature ? (b), Question 7. (c), Question 2. Answer: An alloy is usually made by mixing together metals in their molten form. (c) a homogeneous mixture State whether a displacement reaction will occur if the following are mixed. It is used in the manufacture of carbon disulphide, which is used as an industrial solvent. Answer: (d) FeSi03 Why are they used to make ornaments? 2. Answer: Question 9. What happens when When an object is placed in front of a mirror, the image of … (ii) In general metals react with water to form a metal oxide or hydroxide and hydrogen gas. Click here to get an answer to your question ️ Why silver is used in making mirrors? Also write the equation of the reaction. (c) more Answer: form of currency by more people throughout history than any other metal, This method can be done by the following ways: (i) Galvanizing: Clean iron sheets are dipped in molten zinc to deposit a layer of zinc on it. Metals are …….. conductors of heat and ………. Question 11. Give two uses of sulphur in chemical industry. 1. Why ? silver, with other metals, accumulates as a slime at the anode while It shows that metals are good conductors of electricity and non-metals are poor conductors of electricity. Silvering is still used to make modern day mirrors, but the process doesn’t always use silver. Silver mining in North America dates back to the eighteenth century. 10. Answer: Activity 7 (NCERT Textbook, Page 50) Will he succeed ? To recover silver from (b) One metal which is used to prepare hydrogen gas in the laboratory. The slimes are collected, then Ans: Tin is electroplated on iron to make food containers. Ans: phosphorous rapidly burn in air at room temperature so it is stored under water for safety. a. copper sulphate and zincb. (d) an element (c) Iron is ______ reactive than copper. If deflagrating spoon is not available, you may take a metallic cap of any bottle and wrap a metallic wire around it and give it the shape shown in Fig. That is why the blue colour of copper sulphate changes to colourless and a powdery red mass of copper is deposited at the bottom of the beaker. Which of the metals will react with oxygen when heated ? Explain. Matsushita Electric Industrial Co., Ltd. in Osaka, Japan, in the United States; Nevada mines produced 22.8 million troy ounces (709 Ans: Aluminium protects itself against corrosion upon exposure to air by forming a layer of aluminium oxide. Name the element commonly used for converting edible vegetable oils into vanaspati ghee. Blue litmus paper do not show any colour change with the solution. Observe and group these materials into good conductors and poor conductors. 4. Control that many viruses, including those linked to Acquired Weird & Wacky, Copyright © 2020 HowStuffWorks, a division of InfoSpace Holdings, LLC, a System1 Company. (a) Alnico(b) Solder(c) Stainless steel(d) Zinc AmalgamAnswer:(d), Question 12.Which of the following methods is suitable for preventing an iron frying pan from rusting? (c) Bronze Identify the most reactive and least reactive metal amongst the followings : An iron knife kept dipped in blue copper sulphate solution changes to light green. iron sulphate and zinc, Ans:(a) Copper sulphate and Zinc: A displacement reaction will occur between copper sulphate and zinc because zinc is placed above copper in the reactivity series. What is the percentage’of gold in the ornaments ? Take a small iron nail, a coal piece, a piece of thick aluminium wire and a pencil lead. (c) A metal which is used for galvanising iron. Write word equations of the reactions involved. (vi) (a), Question 9. onto the cathode. Although it is usually found in ores with less rare metals, Thus, it will replace copper.Zn + CuSO4 –> ZnSO4 + Cu, (b) Copper sulphate and Iron: A displacement reaction will occur because iron is placed above copper. 7. Lower. million grams) of silver. Answer: Copper, aluminium, iron, silver, gold, etc. Solution: must react with cyanide solutions; the silver ores must be relatively free Phosphorus occurs in nature in the combined state as it has strong affinity for oxygen. (Platinum/iron) is the member of the family of noble metals. (e) A metal that bums in oxygen with a bright light. Generally, non-metals are not conductors of electricity, which of the following is a good conductor of electricity? Which among the following aljoys contain non-metal as one of its constituents? (c) zinc is more reactive than tin 4 Silver is recovered from heap leach solutions in one of several ways. Give the reaction. (a) All metals are ductile. When reaction stops, touch the beaker.

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