Zinc sulphate and magnesium 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. Oxygen is evolved at the anode which reacts with aluminium to form a uniform protective layer of aluminium oxide. 3. Iron sheets are galvanised before use so that they do not corrode. 4. Copper displaces zinc from zinc sulphate solution. Which metal is displaced during this reaction? Would it still have been such a useful metal .Give reason? (d) Some non-metals are ductile. Prediction I predict that this experiment should be a displacement reaction. 2Na + 2H2O ———–> 2NaOH + H2, (ii) Magnesium reacts with hot water or steam. Question 4: Mark T if the statement is true and mark F if the statement is not true. (d) Coal can be drawn into wires. NCERT Solutions Class 10 Science (Physics,Chemistry, Biology). Question 14.State whether the following statements are True or False : 1. ? (a) A metal which floats on water, reacts with it and forms an alkali. (b) Sodium is a very reactive metal. Zinc is more reactive. Why is phosphorous stored under water? The discrepancy is likely to be a combination of heat loss and error in determining the concentration of copper sulphate. The magnesium turns black as it becomes coated in a layer of lead that’s been displaced from the lead nitrate solution. Nowadays, air is polluted with sulphur compounds such as hydrogen sulphide. (ii) to manufacture silicones, which are used for making waterproof clothes, greases and polishes. (a) Generally, non-metals react with acids. A doctor diagnosed a patient with iron deficiency, and gave him tablets containing iron. Zinc is higher than copper on the electromotive series, so will react to displace the copper from copper sulfate. (b) One metal which is used to prepare hydrogen gas in the laboratory. 1. Give the names and composition of alloys that are used for the following. (iii) in oxy-hydrogen flame for cutting and welding metals. After few days when zinc plate was taken out of the solution, a number of holes were observed on it. (a) No reaction occurs when dilute sulphuric acid is poured on a copper plate. (False) (iv) Copper displaces zinc from zinc sulphate solutions. They occur free in nature . Zinc displaces copper from copper sulphate solution. A dark coating of copper metal appears on the zinc within two minutes and when 45 minutes have elapsed, there is a thick coat of copper metal powder on the zinc strip and the blue color of the solution has lightened considerably. (a) Amalgam(b) Brass(c) Bronze(d) SteelAnswer:(d), Question 10.Which of the following is purest form of carbon? Question 13.Choose appropriate words from the brackets and complete the statements. Heat Conduction (d) Sodium and potassium are stored in kerosene. Filled in electric tube and glow sign: – Neon9. The original blue color of the solution persists. Coal can be drawn into wires. (c) Wrapping food Sodium is a very reactive metal. Which gas will be liberated when metals react with cold water ? Metals aremalleable and ductile in nature whereas non-metals are neither malleable nor ductile; they are brittle. 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. The metals mostly used are tin and zinc. An alloy is usually made by mixing together metals in their molten form. Discuss briefly the different methods used for preventing corrosion of metals. Copper displaces zinc from zinc sulphate solution. Generally, non-metals react with acids. Then repeat the same kind of treatment on the coal piece and pencil lead. sheets (metals) - can not be beaten into thin sheets -(non-metals) The following reaction occurs:C (red hot) + O2 ————–> (H2 + CO) water gas, Your email address will not be published. The gold jewellery is dipped into an acidic solution called aqua regia (a mixture of hydrochloric acid and nitric acid) for polishing. Mark ‘T’ if the statement is true and ‘F’ if it is false. ( ) True iii. copper,aluminium. Which of the metals will react with oxygen when heated ? Ans: It is done by passing an electric current through sulphuric acid using aluminium rod as anode. 3. This is indicated by colour change from blue to colourless. No reaction occurs because zinc is less reactive metal than copper. (a) Aluminium foils are used to wrap food items. Ans: Sodium and potassium react quickly with oxygen at room temperature so they are stored in kerosene oil. ( )-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. [NCERT] Metals are …….. conductors of heat and ………. Immersion rods for heating liquids are made up of metallic substances. This reaction shows that zinc is more reactive than copper as it displaces copper from its solution and zinc passes into solution as zinc ions and zinc sulphate solution is formed. (c) Copper displaces zinc from zinc sulphate solution. This is indicated by colour change from blue to colourless. Example: stainless steel is an alloy of iron, chromium and nickel, does not rust easily. Making electric wire: – copper and aluminium 4. Which of the metals become black in the presence of hydrogen sulphide ? (c) Copper cannot displace zinc from its salt solution. Copper is less reactive than zinc. This is why graphite is not used for making electric cable. Aluminium protects itself against corrosion. What can be the reason for this? (B) True . (e) A metal that bums in oxygen with a bright light.Answer: Zinc can displace copper from copper sulphate solution and iron from ferrous sulphate solution. Graphite is a good conductor of electricity, therefore, it is used as an electrode in dry cell. Lower the value of reduction potential more easily is the substance oxidised and greater the value of reduction potential, more easily is the substance reduced. What is an alloy? (a) All metals are ductile. Copper coils are used in several electrical appliances. Mark ‘T’ if the statement is true and ‘F’ if it is false. (c) Copper displaces zinc from zinc sulphate solution. Zinc displaces copper from copper(II) sulphate solution. zinc is more reactive than copper hence it displaces the copper in copper sulphate solution to become zinc sulphate and copper metal is formed 2. Mark ‘T’ if the statement is true and ‘F’ if it is false. So, here , on adding zinc to CuSO4 solution, zinc displaces copper from copper sulphate & forms zinc sulphate solution. iron sulphate and coppere. Non-metals are generally (malleable/brittle). It is used as a catalyst in the manufacture of sulphuric and nitric acid. (b) Covering with another metal: Depositing a layer of another metal which is more resistant to corrosion is another commonly used method. Examples: gold, silver, platinum. It can only be stored in a liquid hydrocarbon like mineral oil or kerosene oil. pins, cooking utensils, electrical gadgets. This should occur as zinc is higher in the reactivity series than copper. the copper would not spontaneously become zinc plated. State whether a displacement reaction will occur if the following are mixed. If a galvanic cell is prepared correctly, what would the initial multimeter reading be? Which of the following statements is true about the reaction between zinc and copper sulfate? On addition of the zinc, the solution becomes colourless, and the silver zinc metal is replaced by red/brown copper metal. 2. A The material, generally used is(a) sulphur(b) graphite(c) PVC(d) none of theseAnswer:(c), Question 16.Which of the following non-metals is a liquid? Positive. 5. According to Arrhenius,''the colour of an electrolytic solution is the characteristic of its ions present in that solution.'' [ ] Answer: (a) False (b) True (c) False (d) False… (d) Jewellery Answer: Copper is less reactive than zinc. 4. (d) Zinc sulphate and iron: A displacement reaction will not occur here because iron is placed below zinc. Thus, it will not replace iron from iron sulphate. ( ) Answer: (a) Generally, non-metals react with acids. Dilute sulphuric acid is poured on copper plate ? Hit hard the aluminium wire also. Ans: No, a wire cannot be drawn out of wood because wood is not a metal, thus it does not have ductility property. But the tablets were not hard and did not look like iron at all. Ans: This is because silver and gold are less reactive than hydrogen. (f) Fuel, A (b) All non-metals are ductile. It is used to alter the properties of metals to suit certain applications. (a) Phosphorus is a very __reactive__ non-metal. Gold is alloyed with copper to make it hard. Negative. ( ) NCERT SOLUTIONS CLASS VIII SCIENCE CHAPTER-4 … Metals like K and Na react vigorously with cold water to form hydrogen gas. Ans: Electric wire is made up of copper because copper is god conductors of electricity. Mark ‘T’ if the statement is true and ‘F’ if it is false. b) Immersion rods for heating liquids are made up of metallic substances because metals are good conductors of heat and electricity. Explain. (vi) Mercury 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. Give an example. State whether the following statement is true or false: ... Zinc displaces copper from copper sulphate solution and mercury does not displaces copper from copper sulphate solution. Close the test tube with a cork.In test tube B, take some pure (distilled) water. In the periodic table, Aluminum is a metal of Group 13 and copper, iron and zinc are transition metals. Ans: The metals which do not react with water, acids and alkalis, occur in the free state in nature are known as noble metals. Making pencil leads: – Graphite 6. As HNO3 is a strong oxidizing agent, it oxidizes the H2 to water and itself gets reduced to oxide of nitrogen (N2O, NO, NO2).Magnesium and Manganese react with very dil.HNO3 to give H2 gas.Mg(s) + 2HNO3 (aq) → Mg(NO3)2 + H2 ; Mn (s) + 2HNO3(aq) → Mn(NO3)2 + H2. Sodium is more reactive than magnesium. Metal reacts with oxygen to form metallic oxides. If a piece of zinc metal is added to aluminium sulphate solution, no reaction takes place. What happen as a result of the reaction, Answer: Carbon is a non metal. But all metals do not react in the same way with water. Q.7 Can you store the lemon pickle in an aluminium utensil? (a) Sulphur(b) Phosphorus(c) Carbon(d) BromineAnswer:(d), C. SHORTANSVVER QUESTIONS (TYPE I): Answer in a sentence or two. (e) Copper displaces silver from silver nitrate but gold does not do this. Record your observations in Table 4.1. (False) (iii) Generally, non-metals react with acids. and maintain their lustre for a long time. (e) Iron sulphate and zinc: A displacement reaction will occur because zinc is placed above iron. Copper cannot displace zinc from its salt solution. (c) Zinc sulphate and copper: A displacement reaction will not occur here because copper is placed below zinc. Copper is purified by electrolysis. (a) Generally, non-metals react with acids. Magnesium displaces three metals, zinc displaces two metals, iron displaces one metal and copper does not displace any of the other three metals. Some properties are listed in the following Table. Ans: phosphorous rapidly burn in air at room temperature so it is stored under water for safety. A metal ribbon bums in air with bright white light and forms a white powder. (F) (ii) Sodium is a very reactive metal. Generally, non-metals react with acids. Why sodium and potassium stored in kerosene? Platinum, gold and silver are used for making jewellery as they do not tarnish. 4. E. LONG-ANSWER QUESTIONS: Answer in about 60 words. Aluminum is extracted electrolytically, which involves passing electricity through an ionic substance in a solvent with the presence of two rods called e… Copper displaces zinc from zinc sulphate solution. This causes a slight loss in its weight. Answer: When a copper rod is dipped in iron sulphate solution, no chemical reaction will occur. Making foil for wrapping food: – Aluminium5. Zinc pieces will dissolve in CuSO 4 solution and the intensity of the blue colour of CuSO 4 solution decreases. What would happen IF copper were to be dipped into a solution of zinc sulfate? (b) Sodium is a very reactive metal. Ans: (a) It is widely used to make electric wires and cables. (b) Metals are good conductors of heat and __electricity__. Aluminium is a good conductor of electricity, so, it is used for making electrical wires. Explanation - Zinc is more reactive than copper. Which metals will react with cold water ? Now cover the test tube and shake well. German silver has (copper/silver) as major constituent. When sulphuric acid is poured on copper plate, copper sulphate and hydrogen gas are produced. Why are musical instrument and bell made up of metal? However, if the tin layer gets scratched, the iron starts rusting at that place. Copper can effectively help to prevent the spread of respiratory viruses, which are linked to severe acute respiratory syndrome (SARS) and Middle … Metals are good conductors of electricity, therefore, they are used for making immersion rods. Ductility 8. [DAV2008]. (d) Metals react with acids to produce __hydrogen__ gas. Write word equations of the reactions involved. Coal can be drawn into wires. 1. Ans: Aluminium protects itself against corrosion upon exposure to air by forming a layer of aluminium oxide. How alloys are generally made? (i) Gold gold, silver. d) Sodium and Potassium are highly reactive metals which readily reacts with atmospheric Oxygen to catch fire hence Sodium and Potassium are stored in kerosene. ( ) F. 2. (iv) Alloying: An alloy is a mixture of two or more metals. 4. copper sulphate and ironc. Thus, this is done by a process called anodizing to make it corrosion resistant. Noble gases are found in (free state/compound forms). B (Iodine/bromine) has antiseptic properties. True . (a) Phosphorus is a very _________non-metal. The electrodes are connected to a DC power supply and a voltage is applied - the negative lead on the copper electrode and the positive lead on the zinc … Distinguish between metals and non-metals on the basis of these properties. (b) Sodium is a very reactive metal. (a) Zinc (b) Phosphorus (c) Sulphur (d) Oxygen. FeSO 4 (aq) + Zn (s) → ZnSO 4 (aq) + Fe (s). (a) Generally, non-metals react with acids. 1. True. Give reasons. Thus, it will replace iron.Zn + FeSO4 —> ZnSO4 + Fe. They do not losetheir shine easily. ( ) 2. ( ) (c) Copper displaces zinc from zinc sulphate solution. Your email address will not be published. Ans: Musical instrument and bell are made up of metal because metal produce ringing sound when stuck by something. Question 71. (a) How will she find the nature of the gas? The magnesium turns black as it becomes coated in a layer of lead that’s been displaced from the lead nitrate solution. ... Copper displaces zinc from zinc sulphate solution. So, here , on adding zinc to CuSO4 solution, zinc displaces copper from copper sulphate & forms zinc sulphate solution. Copper cannot displace zinc from its salt solution. c) Copper cannot displace zinc from its salt solution because Zinc is more reactive than copper. Question 4: Mark ‘T’ if the statement is true and ‘F’ if it is false. That is why the reaction of oxygen and water with aluminium appears to be slower than with iron. So zinc is more reactive than iron and copper. Ans. Fe + CuSO4 --> FeSO4 + Cu, Q.10 Saloni took a piece of burning charcoal and collected the gas evolved in a test tube. zinc sulfate solution. Non-metals are generally (malleable/brittle). Q.2 Which of the following statements is correct? Used for Names Composition(a) Making statues bronze copper, tin(b) Joining wires in electronic equipment solder lead, tin(c) Making surgical instrument stainless steel Iron, chromium, nickel(d) Making bodies of aircraft duralumin aluminium, copper, magnesium, manganese(e) Making accurate laboratory balances magnalium aluminium, magnesium(f) Making bodies of ships steel iron, carbon. (a) Generally, non-metals react with acids. Potassium after combustion will form (acidic oxide/basic oxide). ( ) (b) Sodium is a very reactive metal. In this reaction, the blue colour of copper sulphate fades and there is a deposition of copper on the iron nail. on adding zinc to C u S O 4 solution, zinc displaces copper from copper sulphate & forms zinc sulphate solution because zinc is more reactive metal which displaces less reactive metal from its solution. The Activity Series can also be used to explain why Iron is coated with Zinc (a process known as Galvanization) and why the Thermite reaction occours. 4. Ans: (a) False (b) True (c) False (d) False ( … (True) (ii) Coal can be drawn into wires. ( ) (d) Coal can be drawn into wires.
Statement-2: The of Zn is -0.76 volts and that of Cu is +0.34 volts. It can dissolve gold, even though neither of these acids can do so alone. Ans: Metals react with water to form oxides or hydroxides and hydrogen. Which among the following aljoys contain non-metal as one of its constituents? 6. zinc sulphate and ironf. Mg + H2O ——>MgO + H2 (iii) Zinc reacts only with steam.Zn + H2O —> ZnO + H2 ↑. Mark ‘T’ if the statement is true and ‘F’ if it is false. (C) False . ( ) (b) Sodium is a very reactive metal. ( ) 4. (i) Gold Deerfield Academy AP Chemistry Project by Richard Park and Alex Platt 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? (Iodine/bromine) has antiseptic properties. D.SHORT-ANSWER QUESTIONS (TYPE II ) : Answer in about 30 words. This happens because iron is more reactive than copper. A typical example of a single displacement reaction where one metal displaces another is the reaction between iron and copper sulfate, given by the reaction Fe + CuSO 4 → FeSO 4 + Cu. Zinc replaces copper in copper sulphate, because it is more reactive. 8. (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. The metallic oxide formed would be acidic or basic in nature ? Then drop in the nail. When iron nails are placed in copper sulphate solution, iron sulphate and copper are formed. (i) in the electronic and computer industries to make devices like transistors, microchips and solar cells. ( ) (iii)Generally, non-metals react with acids. So, it can be used to wrap food items. ( ), Copper displaces zinc from zinc sulphate solution. ( ) Open in new tab link Answer (a) True (b) False (c) False It was found that blue colour of the solution gets fader and fader with the passage of time. Ans: If copper had been higher up in the reactivity series it would have been very reactive, and would not have been useful as it would have got easily corroded. Suppose copper was high up in the reactivity series? Pickle consists of acids which react with Aluminium metal to produce salt and Hydrogen. Also write the equation of the reaction. Why not? 1. This is indicated by a colour change from blue to colourless. Thus, it will not replace zinc. To avoid this they are stored in kerosene. List different uses of metals that you come across in everyday life. Ans: Difference between the physical state of metals and non-metals:Metals are solid at room temperature except mercury which is liquid whereas non-metals are found in solid, liquid and gaseous state at room temperature like carbon, phosphorus, etc., are solids; bromine is a liquid while hydrogen,nitrogen, etc., are gases. Filled in gas balloon: – Helium 10. 25.2k LIKES 7.7k VIEWS Reason: Zinc is less reactive than copper. Magnesium reacts with cold water. ( ) (c) Copper displaces zinc from zinc sulphate solution. Boil it for one minute to remove any dissolved air. 1 What is the difference between the physical state of metals and non-metals at room temperature? (a) Thermometers. Is the solution acidic or basic? 1. b) True 1. (d) Coal can be drawn into wires. A student dips a zinc plate in copper sulphate solution. F. 4. Cu + H2SO4 (conc.) In the following question, a statement of Assertion (i) followed by a statement of Reason (R) is given. Filling electric bulb – Argon 2. (a) Zinc is more reactive than Copper Sol. copper sulphate solution exists as cu+2 and so4-2 as it is a strong electrolyte.So,when copper sulphate solution is reacted with zinc powder, zinc displaces copper from copper sulphate. Ans: The property of metals by which they can be beaten into thin sheets is known as malleability, e.g. (a) Generally, non-metals react with acids. Zinc being a more reactive element (above copper in the reactivity series) than copper displaces copper from its compound. Silver is lower in the reactivity series than Zinc and therfore cannot displace the Sulphate from the Zinc. ( ) (c) Copper displaces zinc from zinc sulphate solution. 5. Write word equations of the reactions involved. ( ) 3. Pure gold cannot be used for making jewellery because it is very soft. (i) State the reason for changes observed on the zinc plate. a) In a test tube containing gas, add a few drops of water. Aluminium foils are used to wrap food items. Answer: (a) False (b) True (c) False (d) False The activity shows that for rusting to take place, both air (oxygen) and water are essential. 5. 2. Give the equation of the reaction taking place. It will change from blue to red. Metals have the property of sonorosity so they are used for making bells. Mark ‘T’ if the statement is true and ‘F’ if it is false. It is possible that the concentration of copper sulphate was lower and therefore less zinc reacted, releasing less energy than expected. 2. (iv) Carbon Conduction of electrical - good conductor ( metals) - bad conductor (non metals), Q.6 Give reasons for the following. 6 Answers. (e) Machinery Since Zinc is more reactive than Copper, Zinc displaces Copper from Copper sulphate to form Zinc sulphate and Copper. Question 1.Which of the following properties is generally not shown by metals? (a) When Zinc is added to the copper sulfate solution, then Zinc will displace copper from its position to form Zinc sulfate. Mark ‘T’ if the statement is true and ‘F’ if it is false. (g) Non-metals react with water to form a gas which burns with a ‘pop’ sound. Aluminium is a highly malleable metal and can be made into foils. Zn(s)+ CuSo 4( aq)→ ZnSo4(aq)+ Cu(s) (b) When an aluminum metal reacts with dilute HCl(Hydrochloric Acid) to for Aluminum Chloride(AlCl3) and Hydrogen(g) will be evolved in the reaction. Silver is the best conductor of electricity Can you say why electric wires are not made of silver? [ ] (d) Coal can be drawn into wires. Why are electric wire made up of copper? False v. Metals are harder than non-metals. Malleability - Can be beaten into thin The iron (II) sulphate that was pale green will become colourless when zinc sulphate is formed. If this layer is made more uniform, it protects the aluminium underneath more effectively. 2Cu + O2 → 2CuO; 4Al + 3O2 → 2Al2O3. (d) Jewellery When zinc is placed In a solution of copper(II) sulfate, the zinc will replace the copper to become zinc sulfate and elemental copper. The magnesium displaces the lead from solution to form magnesium nitrate, so magnesium must be more reactive than lead. Question 5. (vi) Mercury Copper displaces zinc from zinc sulphate solution. Why ? Q2. (c) A metal which is used for galvanising iron. This is why we do not store Zinc sulphate solution in an aluminum vessel overnight. Give reason: Chemical reaction does not take place when copper is added to iron sulphate solution. Give reasons. 5. Give three examples of reactions between metals and water, to show that different metals have different relativities. (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? Her mother gave old gold jewellery to the goldsmith to polish. 6. Sodium and potassium are highly reactive metals. Required fields are marked *. Why silver and gold do not react with hydrochloric acid? Sodium is a very reactive metal. German silver has (copper/silver) as major constituent. ii) Iron being more reactive displaces copper from copper sulphate. Aqua regia is a highly corrosive, fuming liquid. ( ) Answer-(i) Sodium is a very reactive metal. (c) Copper displaces zinc from zinc sulphate solution. 10. Zinc is oxidized, and copper ion is reduced. Metals react with acids to produce ………. (c) One metal which will displace copper from copper sulphate solution. 4. Can a wire be drawn out of wood? Ductility- can be drawn into wire ( metals) -cannot be drawn into wire ( non-metal) The names and composition of alloys that are used for wrapping of food items (. Several days and then examine them metals – gold, silver and gold are less reactive than.! Carbon dioxide gas and polishes put into a container containing dil.HCl by series... 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Can dissolve gold, silver and gold are less reactive metal displace copper displaces zinc from zinc sulphate solution true or false!

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