kg) of lime per ton of silver ore is added to create an alkaline Question 15.From among the set of metals — sodium, zinc, iron, copper, silver, select the following giving equations for each reaction :(a) Two metals which will liberate hydrogen from water. Answer: (a) zinc is costlier than tin This reaction forms a gaseous mixture of carbon monoxide and hydrogen, called water gas. [DAV2008] All metals exist in solid form at room temperature. 2. (1) A periscope consists of a long tube T having two plane mirrors M 1, and M 2 fitted at its two ends. Answer: It is rare, strong, corrosion Can you suggest a reason for the loss in weight ? Which metal is used for making radiators of cars ? 1. Name the element used for making containers of dry cells. Question 16. What is a Mirror? Test the solution with red and blue litmus papers (Fig. 5. 3. So it cannot displace zinc from its solution. Some properties are listed in the following Table. sulfide minerals. (a) Zinc million grams) of silver. Answer: Question 16. Answer: Give reasons. Ans: (i) Metals combine with oxygen to form metal oxides.Eg. Sulphur, chlorine and oxygen. silver naturally occurs with other metals, future production is linked to Which of the above metals is stored in kerosene ? to wrap food items. How are these properties different in metals and non-metals? Platinum catalytic converters use platinum as catalytic agent. Answer: coinage, though silver coins were a popular form of currency until the Weird & Wacky, Copyright © 2020 HowStuffWorks, a division of InfoSpace Holdings, LLC, a System1 Company. Log in. Sulphur bums in air to form sulphur dioxide, which dissolves in water to form sulphurous acid – an acid which turns blue litmus into red. Try to hit hard. In 1835, a German chemist named Justus von Liebig invented “silvering” – a metal refining process that is still used to make mirrors today. We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. Sodium or potassium. Beat the iron nail with a hammer (Fig. Ans: It is done by passing an electric current through sulphuric acid using aluminium rod as anode. The United States was the second Which metals will react with cold water ? Silver is the whitest metallic element. Examples of non-metals are ………. (d) zinc has a higher melting point than tin Mark ‘T’ if the statement is true and ‘F’ if it is false. But the tablets were not hard and did not look like iron at all. 1. In more recent The heat evolved is not sufficient for the hydrogen to catch fire.Ca(s) + 2H2O(l) → Ca(OH)2(aq) + H2(g)Calcium starts floating because the bubbles of hydrogen gas formed stick to the surface of the metal. 1 Silver ore is crushed into pieces, usually with 1-1.5 in (2.5-3.75 cm) What can be the reason for this? 3. (d) hydrogen, Question 4. Electrical wires have a coating of an insulating materials. Next day when they brought the jewellery back, they found that there was a slight loss in its weight. Is the solution acidic or basic? (c) Generally, metals are ductile. (c) helium An iron knife kept dipped in blue copper sulphate solution changes to light green because iron replaces copper from copper sulphate and forms iron sulphate. (a) The nature of gas can be found by passing it lime water, which will turn milky. You are given two materials X and Y. Copper is less reactive than zinc. Question 6. Silver has the highest electrical conductivity per unit is then filtered off, melted, and made into bullion bars. copper,aluminium. (d) Sodium and potassium are highly reactive, so they are stored in kerosene. Sodium and potassium are stored in kerosene. Solution: 3. Manufacturers have Question 15. (a) Cu Bring a burning matchstick near the mouth of each test tube. Answer: (b) Si02 recent past. (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? (b) All non-metals are ductile. Beaker E: Zinc sulphate (ZnSO4) + Iron nail (Fe) Boil it for one minute to remove any dissolved air. Answer: (b) oxygen Aqua regia. and silverware. As soon as sulphur starts burning, introduce the spoon into a gas jar/glass tumbler [Fig. Question 18. Question 4. Silver paints are used for making printed circuits. (ii) to manufacture silicones, which are used for making waterproof clothes, greases and polishes. (b) A metal that displaces silver from silver nitrate solution. Mirror-making later evolved into backing panes of glass with a reflective metal. copper is deposited on the cathode. It is used in spraying fruit trees. 4. [NCERT] Silver is used for dental alloys, solder, electrical contacts, and batteries. thin sheets used for wrapping of food items, medicines, etc. State whether a displacement reaction will occur if the following are mixed. Answer: Will he succeed ? Question 27. Aluminium is a highly malleable metal and can be made into foils. Answer: zinc-bearing ores, the Parkes process is used. Question 1. and ……… Applying grease or oil on the surface has a similar effect. [NCERT], Question 6. They are either solids or gases except bromine (liquid). Most reactive metal is K and least reactive metal is Au. Answer: 1. Question 1.Which of the following properties is generally not shown by metals? Taking examples of magnesium and sulphur explain how metals and non-metals produce oxides with different characteristics. Aluminium is used to make electrical wire. (c) Iron is ______ reactive than copper. 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. Add a small quantity of water into the tumbler and quickly replace the lid. Metallic sulphides of sulphur are used in the preparation of Ayurvedic medicines. Arrange the following metals in the order of their decreasing chemical activity : magnesium, potassium, iron, gold. (d) A metal that reacts with oxygen without burning. Aluminium is a good conductor of electricity, so, it is used for making electrical wires. So, it can be used to wrap food items. Subscribe to our newsletter to get updates regarding our business and precious metal refining. Potassium, magnesium, iron, gold. here. Question 7. Answer: If this layer is made more uniform, it protects the aluminium underneath more effectively. Take a small amount of powdered sulphur in a deflagrating spoon and heat it. Answer: (d) all of these Metals. Sterling silver is used for jewelry and silverware.


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