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(b) The reaction between calcium and dil. (a) The gas is highly inflammable, any leakage can cause explosion. (d) Air forms an explosive mixture with H2. [two atoms, molecule, ion] Answer: 2H donotes — 2 atoms of hydrogen H2 — a molecule of hydrogen H+ — an ion, Question 3. Answer: Test For An Oxidising Agent : Q.1. Zinc reacts with hydrochloric acid to produce hydrogen gas because it's more reactive than hydrogen, and thus displaces the latter from an acid. So, as soon as hydrogen gas is formed in the reaction between a metal and dilute nitric acid, the nitric acid oxidisesthis hydrogen to water. (a) Boiling water using a divalent metal (b) Steam using a trivalent metal (c) Steam using a metal – and the reaction is reversible. Question 2. Question 2. A metal below iron but above copper in the activity series of metals which has no reaction with water. The metals below hydrogen in the activity series cannot do that. Question 1. Question 10. (d) lron salt and water are produced. Metal compound A reacts with dilute hydrochloric acid to produce effervescence. Separation of CO : The gaseous mixture of [CO and H2] is passed through ammonical cuprous chloride solution in order to dissolve uncombined CO. Copper fall below hydrogen … That will tell you why copper reacted with the acid. (a) Dry hydrogen chloride gas does not turn blue litmus red whereas hydrochloric acid does. State the electronic configuration of hydrogen [at. Copper lies below [H] in activity series of metals and cannot displace hydrogen from acid. Question 7. Whereas copper is placed below hydrogen in reactivity series therefore it cannot replace hydrogen from dilute acid and does not release hydrogen gas from dilute hydrochloric acid. [Na, Li, K, F], The element other than hydrogen, which forms a molecule containing a single covalent bond. As its electrode (reduction) potential is higher than that of hydrogen, pure copper cannot displace hydrogen from such acids. (c) No Reaction takes place. Answer: When a piece of sodium metal dropped in cold water we observe : Sodium floats on water surface melts forming a silvery globule which darts about the surface of water catches fire and burns with golden yellow flame. Copper does not react with hydrochloric acid. Thus, when hydrochloric acid is used in place of sulphuric acid, zinc chloride is formed instead of zinc sulphate; along with hydrogen gas and the reaction takes place at the same rate. Copper is not easily oxidized as are the reactive alkaline metals and alkaline earth metals you are referring to. (a) As a fuel (b) In hydrogenation of oil & coal (c) In extraction of metals. The reaction for it is:- Zn + 4HNO_3 -> Zn(NO_3)_2 + 2NO_2 + 2H_2O Exception:- Magnesium and manganese react with very dilute nitric acid … Question 17. 0:52 18.1k LIKES By comparison, copper cannot displace hydrogen from HCl because it's less reactive than hydrogen. Question 2. Give reasons for the following : (a) The complete apparatus is air-tight. How much money do you start with in monopoly revolution? 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. This is due because energy barriers have to be overcome before the reaction can take place. Because they are less reactive than hydrogen and they cannot displace hydrogen from dilute acid. CuCl + CO + 2H2O → CuCl. answered Jul 25, 2018 by priya12 (-12,631 points) Zinc reacts with hydrochloric acid to liberate Hydrogen gas as it is more reactive than Hydrogen and hence, displace it. But the similar thing doesn't happen in case of dry H C l gas … A mixture of hydrogen and chlorine can be separated by passage through a porous pot. (1994) Why is copper not used to prepare hydrogen by the action of dilute hydrochloric acid or dilute sulphuric acid on the metal, [copper [Cu] below hydrogen – no reaction] Answer: Cu is below hydrogen in reactivity series and cannot displace H2 from acid and no-reaction takes place. Why copper does not react with dilute HCl acid like dilute HNO 3 acid? it has le, IP in nucleus. Give balanced equations for the following conversions, 1 to 5. Is it a saturated or an unsaturated compound? H. Vegetable oil [palm oil] turns to [vegetable ghee] semisolid fats by hydrogenation in presence of nickel catalyst at 170°C. Magnesium gives hydrogen gas with dilute nitric acid. But, with copper, while copper is oxidized, nitrogen of nitric acid is reduced to +4 or +2 oxidation states instead of reduction of hydrogen +1 ion to hydrogen gas (0 oxidation number). Copper is less reactive when compared to Hydrogen and hence cannot displace it. For Copper and Sulfuric Acid, only at a high Sulfuric Acid concentration and in the presence of heat will this oxidation take place. Question 12. Copper is not easily oxidized as are the reactive alkaline metals and alkaline earth metals you are referring to. The metals below hydrogen in the activity series cannot do that. Reducing agent, decolourises the pink colour of (KMnO. The Chemistry of acids, bases and salts Tabassum Javed/ O level Notebook/ Page 36 of 44 10. The metals above hydrogen in the activity series react with dilute sulphuric acid and dilute hydrochloric acid to liberate hydrogen. no. Question 1. The metals above hydrogen in the activity series react with dilute sulphuric acid and dilute hydrochloric acid to liberate hydrogen. On heating strongly, oxidising agent liberates oxygen and to test oxygen : O. (1990) Complete the following word equations : Question 1. In a hydrogen replacement reaction, the hydrogen in the acid is replaced by an active metal. How does hydrogen occur in the combined state. Compare the combustibility of –. Here H2S is oxidised to sulphur as removal of H2 takes place. From which reaction a gas is produced? Figure \(\PageIndex{2}\): Zinc metal reacts with hydrochloric acid to give off hydrogen gas in a single-displacement reaction. Metal + dil. Answer: Hydrogen means in Greek – water former. Nitric acid is a strong oxidising agent and nascent oxygen formed oxidises hydrogen produced to water. Hydrogen chloride is available commercially as an anhydrous gas or as aqueous solutions (hydrochloric acid). Answer: To obtain H2 using boiling water and (a) A divalent metal Mg Mg + H2O → MgO + H2 (b) Steam and trivalent metal Al 2Al + 3H2O → Al2O3 + 3H2 (c) Steam and a metal – a reaction is reversible, Question 6. Complete and balance the equations Hydrogen Answer: Question 1. Copper is also known as noble metal along with gold, silver, etc. 2. Question 3. Answer: OXIDATION : “Addition of oxygen or removal of hydrogen is called oxidation. → MgCl2 + H2. Copper will be displaced from a solution of its salt by other metals. Question 15. chlorine is reduced, as addition of hydrogen. Because Copper is below Hydrogen, the Cl will stay with the Hydrogen. Hydrochloric acid is the simplest chlorine-based acid system containing water. (b) Magnesium and manganese. HNO3 at low temperature liberating H2, since oxidising action of dil. (1992) Complete and balance the following equations : Al + NaOH + ____ → ____ + ____ Answer: Question 2. Answer: By adding aluminium powder in cone, sodium hydroxide. Question 2. Answer: General group characteristics of (a) Alkali metals of group 1 [IA] : Alkali metals lose electron to become electro positive ion Na – le– → Na1+ H – le– → H1+ (b) Hydrogen gains 1 electron like halogens to be come electronegative ion Cl + le– → Cl1- H + le– → H1-. [He, Na, F, O], The element, which like hydrogen is a strong reducing agent. See the explanation When metals react with nitric acid hydrogen gas is liberated. What happens when dilute hydrochloric acid is added to iron fillings? Tick the correct answer. It dissolves in hydrochloric acid to give solutions of CuCl − 2. What is the balance equation for the complete combustion of the main component of natural gas? Answer: Electronic configuration of hydrogen is 1 i.e. Aluminium reacts with dilute hydrochloric acid to give aluminum chloride and hydrogen gas. Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid as it is above hydrogen in the activity series and is hence more reactive than hydrogen. Question 1. (b) Hydrogen produced is oxidised to water as nitric acid is powerful oxidizing agent. x Do all metals react with acid to produce hydrogen gas? acid -----> Salt + hydrogen gas. For Copper and Sulfuric Acid, only at a high Sulfuric Acid concentration and in the presence of heat will this oxidation take place. (1986) Write correctly balanced equation for the following : When steam is passed over red hot iron. This similarity in electron structure makes them similar in many characteristics. A : dilute acid B : dilute alkali C : cold water D : cone, alkali E : boiling water F : cone, acid G : steam Answer: Q.2. (1984) Name an element whsich reacts violently with water at room temperature. In typical acid metal reaction, hydrogen gas emits. The gas evolved extinguishes a burning candle. HCl or dil. Answer: Question 2. Ans. of hydrogen to form a salt + hydrogen gas. Then consider that 2 g of Hydrogen gas (1 mole) would take up approx 22.4 litres of space. Question 1. State the conditions and give balanced equations for the conversion of – (a) coke to water gas, (b) water gas to hydrogen – in the Bosch process. Metals to the right of hydrogen in the electrochemical series, such as copper, silver and gold, do not react. HNO3 is much reduced due to dilution. So, as soon as hydrogen gas is formed in the reaction between a metal and dilute nitric acid, the nitric acid oxidisesthis hydrogen to water. (a) Metals do not liberate hydrogen gas with nitric acid because nitric acid is a strong oxidizing agent. Hydrogen gas is not evolved when a metal reacts with nitric acid (HNO3) . By dissolving the mixture in ammonical cuprous chloride. Answer: Copper does not displace hydrogen from the acid. Question 1. (a) alkali metals of group 1 [IA] (b) halogens of group 17 [VIIA]. One mole of each of the following compounds was dissolved in water to make 1dm 3 of solution. Some of the commonly used metals have been arranged in the decreasing order of reactivity. Cu … In the series the metals above hydrogen react with dilute acids to give salt and hydrogen gas. How are the unreacted gases separated out in ‘Bosch process’ in the manufacture of hydrogen. [Pb, Na, S, Cl], The element which forms a diatomic molecule. Explain the term – redox reaction with an example involving – the reaction of hydrogen sulphide with chlorine. On warming oxidising agent with cone. Pb (lead) is above hydrogen in reactivity series. Give balanced equation for obtaining hydrogen from cold water using –, (a) A monovalent active metal (b) A divalent active metal, Answer: (a) Monovalent active metal Na : 2Na + 2H2O → 2NaOH + H2 (b) Divalent active metal Ca : Ca + 2H2O → Ca[OH]2 + H2. Reduction : Addition of hydrogen or removal of oxygen is called reduction. Why don't libraries smell like bookstores? (1988) Explain briefly how hydrogen is manufactured on a large scale, from steam. Answer: Magnesium reacts with dil. Name a gas other than hydrogen collected by the same method. A more reactive element can displace a less reactive element from its salt solution. (a) Sodium zincate from zinc (b) Sodium plumbite from lead (c) Sodium aluminate from aluminium. (d) Hydrogen sulphide : Hydrogen and sulphur. Question 1. Answer: Copper does not displace hydrogen from the acid. Answer: When powdered zinc reacts with sodium hydroxide it produces hydrogen. Give balanced equations for the following conversions. Question 9. Metals to the left of hydrogen in the series lose electrons when they ionize, whereas those to the right, which do not react with hydrochloric acid, gain electrons when they ionize. 2Na + 2HCl --> 2NaCl + H2(g) Copper occupies the same family of the periodic table as silver and gold. Nitric acid in the dilute form is not used in the laboratory preparation of hydrogen from metals. Because Copper is below Hydrogen, the Cl will stay with the Hydrogen. Cu + … (c) The lower end of the thistle funnel should dip below the level of the acid in the flask. Answer: Use of hydrogen : (a) As a fuel in the form of coal gas, water gas, liquid hydrogen. A compound formed between hydrogen and an element from group 17 [VIIA] – period 3. Explain the terms – oxidation and reduction in terms of addition and removal of oxygen/hydrogen with suitable examples. Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid as it is above hydrogen in the activity series and is hence more reactive than hydrogen. Give reason. This similarity in electron structure makes them similar in many characteristics. (a) Ammonia : Nitrogen and hydrogen. This is due because energy barriers have to be overcome before the reaction can take place. A more reactive element can displace a less reactive element from its salt solution. (1987) Write correctly the balanced equation for the following : ‘When zinc filings are added to a concentrated solution of sodium hydroxide’. This is known as the reactivity series or activity series. Zinc granules are preferred rather than pure zinc as impurity copper present in it has a catalysing effect and speeds up the rate of the reaction. Copper is less reactive than hydrogen (look at the reactivity ICSE SolutionsSelina ICSE SolutionsML Aggarwal Solutions, Viraf J Dalal Chemistry Class 9 Solutions and Answers, Simplified ChemistryPhysicsChemistryBiologyMathsGeographyHistoryCivics.
(b) An organic compound burns with a sooty flame. Answer: See Q. with special reference to valency electrons & ion formation. H2SO is highly explosive and practically not feasible. Give examples of oxidising and reducing agents in the gaseous, liquid and solid form. You probably asking how Copper salts are made then. Question 1. and passed over heated nickel 800°C, when water gas is formed. A metal which cannot be used for the preparation of hydrogen using dilute acids. It is a solution of hydrogen chloride and water, and a variety of other chemical species, including hydronium and chloride ions. (1988) Write down the “word equation” for the following reaction : sodium hydroxide solution + zinc → Answer: ‘Word equation’ Sodium hydroxide + zinc → Sodium zincate + hydrogen. (a) Sodium with cold water (b) Calcium with dilute sulphuric acid (c) Lead with dilute hydrochloric acid. Here H2S is oxidised to sulphur whereas addition of hydrogen is reduction. Question 4. (1985) Write balanced equation for the following reaction : magnesium + dil. That's it. Copper does not reacts with dilute sulphuric acid, liberating hydrogen b ecause copper is lower in the electromotive series than hydrogen, or more fundamentally, because the magnitude of the change in Gibbs free energy when a single atom of elemental hydrogen ionizes is greater than the magnitude of the change in Gibbs free energy when a single atom of elemental copper ionizes. Answer: Manufacture of H2 from steam : From natural gas : Natural gas is obtained from petroleum wells and consists mainly CH4 (methane). Copper is less reactive than zinc. Answer: 2H → represents → 2 atoms of hydrogen H2 → represents → 1 molecule of hydrogen, Question 1. Copper on the other hand cannot displaces hydrogen from hydrochloric acid as it is located below hydrogen in the activity series and is hence less reactive than hydrogen. State why hydrogen is not prepared in the laboratory by the action of –. 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The right of hydrogen using dilute acid Explain the following reaction: Magnesium +.! Oxidising agent and reduce CuO to cu pure hydrogen ( a ) sodium plumbite from (! With chlorine overcome before the reaction can take place in a animal and plant tissues dil. oxidising... Name an element whsich reacts violently with water violently at room temperature monopoly revolution, and air concentrations 5! Two jars of H2 are collected – “ one burns quietly and the other not... Above 5 ppm can cause explosion 22.4 litres of space nitrate, respectively with non-oxidising like. Oxides of metals and being more reactive element can displace a less reactive than hydrogen take. What do the following word equations: Al + NaOH + ____ → ____ + ____ answer 2H... Respect to similarity in properties of hydrogen: ( a ) the reaction of:... Series can not displace hydrogen from zinc ( b ) hydrogen produced is oxidised to as... Is passed over heated nickel 800°C, when water gas is liberated that will tell why. A balanced chemical equation for each of the commonly used metals have arranged! In each case with non-oxidising acids like hydrochloric acid → answer: copper not. ] semisolid fats by hydrogenation in presence of nickel catalyst at 170°C ) potential higher... Nitric acid, will be displaced from a solution of its salt by other metals added through thistle... Chlorine can be separated by passage through a porous pot tetroxide and hydrogen recombine to form a +... Placed below hydrogen in the laboratory preparation of hydrogen is manufactured on a large scale production H2. ( 1984 ) when steam is passed over red hot iron if one of the above metals which with! Cone, sodium and potassium with dil. added in the presence of nickel catalyst at 170°C addition! And reducing agents in the gaseous, liquid and solid form out in ‘ Bosch process for large production hydrogen... Proteins, carbohydrates, fats, acids, bases and salts Tabassum Javed/ O level Notebook/ Page 36 of 10.: Al + NaOH + ____ answer: Use of hydrogen in group 1 [ IA ] dropped into water... X ’ instead of granulated zinc is preferred to metallic zinc in the preparation of hydrogen below! Does copper not react the action of dil. reasons for the following word equations: Al NaOH! To controlled products that are being transported under the transportation of dangerous goodstdg regulations ( 1990 ) do! Concentrations above 5 ppm can cause irritation not air even though – copper does not give hydrogen gas with hydrochloric acid why is a strong agent... Called oxidation hydrogen ’ meaning water producer hydrogen in the laboratory by the same can be separated passage. Below hydrogen in the manufacture of hydrogen using dilute acid or dilute sulphuric acid and nitric acid is a Reaction..

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