So zinc is more reactive than iron and copper. thin sheets used for wrapping of food items, medicines, etc. Why ? (b) Sodium is a very reactive metal. F. Question 7. Why are musical instrument and bell made up of metal? T. 3. This is indicated by a colour change from blue to colourless. (b) Metals are good conductors of heat and __electricity__. ( ). The property of metals by virtue of which they can be dr Give the equation of the reaction taking place. Aluminium foils are used to wrap food items. What is the advantage of galvanized iron over tin-plated iron? (a) Fullerenes(b) Graphite(c) Diamond(d) SulphurAnswer:(b), Question 14.Food cans are coated with tin and not with zinc because(a) zinc is costlier than tin(b) zinc is less reactive than tin(c) zinc is more reactive than tin(d) zinc has a higher melting point than tinAnswer:(a), Question 15.Electrical wires have a coating of an insulating materials. When iron nails are placed in copper sulphate solution, iron sulphate and copper are formed. d) False, Some properties are listed in the following table. Ductility Give reasons. This is indicated by colour change from blue to colourless. ( )-a-FalseNon Metals do not react with acidFor exampleIf we take charcoal powder in a test tube and add hydrochloric acid in it.No reaction will take place-ea-(b) Sodium is a very reactive metal. Explain. What is an alloy? Zinc is a nutrient that plays many vital roles in your body. Graphite is used as an electrode in the dry cell. The solvent extraction of zinc from copper-zinc sulphate solutions is a known process (Barthel et al., 1978 ), and it was thoroughly investigated for the recovery of both copper and zinc from the leach solution. Distinguish between metals and non-metals on the basis of these properties. The two metals which … Fill in the blanks. Fe + CuSO4 --> FeSO4 + Cu, Q.10 Saloni took a piece of burning charcoal and collected the gas evolved in a test tube. ( ) (c) Copper displaces zinc from zinc sulphate solution. F. 4. Ans. Sodium is a very reactive metal. Silver does not corrode and it is malleable and ductile, therefore, it can be used in jewellery. Metallic sulphides of sulphur are used in the preparation of Ayurvedic medicines. (c) Iron is ____________reactive than copper. Mark ‘T’ if the statement is true and ‘F’ if it is false. Q.9 What happens when Conduction of Electricity, 1. 2. Hence pickle is not stored in aluminium utensil. Ans: Metals react with water to form oxides or hydroxides and hydrogen. All metals exist in solid form at room temperature. Statement-1: Zinc displaces copper from copper sulphate solution. ( ) Answer-(i) Sodium is a very reactive metal. It has been noticed that silverware becomes black faster today than it did fifty years ago. Some properties are listed in the following Table. (iii) in oxy-hydrogen flame for cutting and welding metals. This is the advantage of galvanized iron over tin-plated iron. (d) Jewellery (d) Zinc sulphate and iron: A displacement reaction will not occur here because iron is placed below zinc. gas. Explanation - Zinc is more reactive than copper. Q3. Metals have the property of sonorosity so they are used for making bells. (d) Metals react with acids to produce ____________ gas. Copper displaces zinc from zinc sulphate solution. It will change from blue to red. No reaction occurs because zinc is less reactive metal than copper. Ans: Sodium and potassium react quickly with oxygen at room temperature so they are stored in kerosene oil. Can you suggest a reason for the loss in weight? Zinc is more reactive than copper. Ans: This is because it is very expensive. (c) Copper displaces zinc from zinc sulphate solution. a. copper sulphate and zincb. 2Na + 2H2O ———–> 2NaOH + H2, (ii) Magnesium reacts with hot water or steam. Question 4: Mark ‘T’ if the statement is true and ‘F’ if it is false. Required fields are marked *. 2. If Zinc displaces Copper from Copper Sulphate solution, this indicates that (a) Zinc is more reactive than Copper (b) Copper is more reactive than Zinc (c) Both Copper & Zinc are equally reactive (d) Copper Sulphate is unstable Ans. 2Cu + O2 → 2CuO; 4Al + 3O2 → 2Al2O3. It is used in the manufacture of carbon disulphide, which is used as an industrial solvent. Ans: Tin is electroplated on iron to make food containers. 5. Which gas will be liberated when metals react with cold water ? Which metals will react with cold water ? Aluminum is extracted electrolytically, which involves passing electricity through an ionic substance in a solvent with the presence of two rods called e… How many grams dry NH4Cl need to be added to 1.80 L of a 0.500 M solution of ammonia, NH3, to prepare buffer solution that has a pH of 8.53? However, if the tin layer gets scratched, the iron starts rusting at that place. Example: stainless steel is an alloy of iron, chromium and nickel, does not rust easily. Malleability 4. Can a wire be drawn out of wood? [ ] (c) Copper displaces zinc from zinc sulphate solution. Nowadays, air is polluted with sulphur compounds such as hydrogen sulphide. (d) A metal that reacts with oxygen without burning. Mark ‘T’ if the statement is true and ‘F’ if it is false. [NCERT] (a) Ductility(b) Sonorous(c) Dullness(d) Electrical conductionAnswer:(c), Question 2.The most abundant element in the universe is(a) hydrogen(b) oxygen(c) helium(d) carbonAnswer:(a), Question 3.The ability of metals to be drawn into wires is known as(a) ductility(b) conductivity(c) malleability(d) sonorousityAnswer:(a), Question 4.The most abundant element in the earth crust is(a) iron(b) oxygen(c) silicon(d) aluminiumAnswer:(b), Question 5.Galvanisation is a method qf protecting iron from rusting by coating with a thin layer of(a) silver(b) galium(c) zinc(d) aluminiumAnswer:(c), Question 6.The most abundant ihetal in earth crust is(a) Cu(b) Al(c) Fe(d) ZnAnswer:(b), Question 7.An alloy is(a) a compound(b) a heterogeneous mixture(c) a homogeneous mixture(d) an elementAnswer:(c), Question 8.In extraction of copper, the flux used is(a) FeO(b) Si02(c) CaO(d) FeSi03Answer:(b), Question 9.Alloys are homogeneous mixtures of a metal with a metal or non-metal. 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