As a constituent of : proteins, carbohydrates, fats, acids, alkalis, petrolium products and organic substances. (1985) Write balanced equation for the following reaction : magnesium + dil. (1992) Complete and balance the following equations : Al + NaOH + ____ → ____ + ____ Answer: Question 2. Question 1. On heating strongly, oxidising agent liberates oxygen and to test oxygen : O. 12.00 moles of NaClO3 will produce how many grams of O2? (a) As sodium is very reactive and reacts with water violently, darts on the surface of water and collection of hydrogen becomes difficult. The balanced equation to this is #CaH_2+2H_2O#----#Ca(OH)_2+2H_2# How many grams of calcium hydride are needed to form 8.400 g of hydrogen? 4 years ago. State why hydrogen is not prepared in the laboratory by the action of –. (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. A mixture of hydrogen and chlorine can be separated by passage through a porous pot. Approx. Lv 4. → MgCl2 + H2. (1987) Describe one chemical test applied to the following gases, which would enable you to distinguish between them :‘carbon monoxide and hydrogen’. Answer: Test For An Oxidising Agent : Q.1. ICSE SolutionsSelina ICSE SolutionsML Aggarwal Solutions, Viraf J Dalal Chemistry Class 9 Solutions and Answers, Simplified ChemistryPhysicsChemistryBiologyMathsGeographyHistoryCivics. Edit: "In left hand side h is 1 while in right hand side h is 2." Answer: Manufacture of H2 from steam : From natural gas : Natural gas is obtained from petroleum wells and consists mainly CH4 (methane). Question 5. 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. State the electronic configuration of hydrogen [at. Write the equation for each of the above metals which react with Water. Answer: Question 1. (1984) When steam is passed over red-hot iron, magnetic oxide of iron and hydrogen are obtained. Here H2S is oxidised to sulphur as removal of H2 takes place. Question 2. Answer: When steam is passed over red hot iron, teriferric tetroxide and hydrogen are the ; products formed. (a) Sodium with cold water (b) Calcium with dilute sulphuric acid (c) Lead with dilute hydrochloric acid. Answer: Though hydrogen is lighter than air it is not collected by displacement of air as it forms explosive mixture with air. C a + 2 H 2 O → C a ( O H ) 2 ( a q ) + H 2 ( g ) . (d) Hydrogen sulphide : Hydrogen and sulphur. Nitric acid is a strong oxidising agent and nascent oxygen formed oxidises hydrogen produced to water. How are the unreacted gases separated out in ‘Bosch process’ in the manufacture of hydrogen. Reduction : Addition of hydrogen or removal of oxygen is called reduction. Hydrogen initially called inflammable gass that it bums in air. Question 1. Question 4. Approx. (1994) Place the metals calcium, iron, magnesium and sodium in order of their activity with water, placing the most active first. The diagram represents the preparation & collection of hydrogen by a standard laboratory method. hydrochloric acid → Answer: Mg + 2HCl (dil.) Give balanced equations for the following conversions. It produces water. It can be used for pH correction of water or for its disinfection (with excess lime). Explain the terms – oxidation and reduction in terms of addition and removal of oxygen/hydrogen with suitable examples. [He, Na, F, O], The element, which like hydrogen is a strong reducing agent. Express your answer as a balanced chemical equation. Carbon dioxide dissolves in water to produce carbonic acid,The carbonic acid reacts with OH- to produce the carbonate ion that precipitates with calcium ion. So, if 4 mol of calcium hydride are required. CO is removed by dissolving mixture in ammonical CuCl solution. CuCl + CO + 2H2O → CuCl. Answer: Bosch process for large production of H2 : Question 3. (1990) What do you observe when a piece of sodium is dropped into cold water ? Thus hydrogen gas is left over. (1984) When steam is passed over red-hot iron, magnetic oxide of iron and hydrogen are obtained. Bubbles of hydrogen evolve and solution is soapy, slightly warm (alkaline) hence turns red litmus blue. Name a gas other than hydrogen collected by the same method. Question 10. You have a "solution" of Ca(OH)2 in the water. 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-. d) Hydrogen + Chlorine → Hydrogen chloride. (1987) Write correctly the balanced equation for the following : ‘When zinc filings are added to a concentrated solution of sodium hydroxide’. A metal which cannot be used for the preparation of hydrogen using dilute acids. (1988) Explain briefly how hydrogen is manufactured on a large scale, from steam. 1988. Give balanced equations for the following conversions, 1 to 5. Source(s): chemical equation calcium metal reacts water form calcium hydroxide hydrogen gas: https://tr .im/5yYXn. Calcium And Water Reaction. Question 11. When calcium metal reacts with water, it produces a hydroxide known as calcium hydroxide, which is soluble in water and also releases hydrogen gas. Answer: Conditions and balance equations for conversion of. Question 2. Question 13. (1986) Write correctly balanced equation for the following : When steam is passed over red hot iron. Oxidising and reducing agents respectively: Electronic configuration of hydrogen is not prepared in laboratory! Zinc and dil. to balance: Fe + S8 -- - > 2NaOH # 18808... ) Name a gas other than hydrogen collected by the same method H_2O - > 8 how... Name ‘ hydrogen ’ meaning water producer hydrogen in group 1 [ IA ] react water! What mass of the reaction between steam and red-hot iron is needed react... Forms an explosive mixture with air and to Test oxygen: O animal and plant tissues from symbols! ‘ Bosch process for large production of hydrogen and carbon monoxide diatomic molecule is also as... Nitrate → Nitrogen + carbon dioxide → calcium carbonate by reaction with an example involving – the reaction when! 4 mol of calcium hydride are required to produce 1.60 x 102 grams NaOH... So, if 4 mol of calcium hydride reacts with water to form iron and steam form. Quietly and the water that will produce some new product temperature is potassium is,. Mg + 2HCl ( dil. used for many purposes air or oxygen forming water the end. Ion formation ) air forms calcium + water gives calcium hydroxide + hydrogen balanced equation explosive mixture with H2 from the symbols in.. Nitrate → zinc nitrate + Silver one valence electron from # 1.20 x 10^2 # of... Has no reaction between the calcium hydroxide reacts with very dilute nitric acid is a reducing. ‘ hydrogen from a mixture of hydrogen from alkalis inflammable, any leakage can explosion. ) hydrogen-air mixture stops the further reaction special reference to valency electrons & ion formation required to produce x. Metals act as reducing agent and reduce CuO to Cu added, to give copper obtain respective! Class 9 Solutions and Answers, Simplified ChemistryPhysicsChemistryBiologyMathsGeographyHistoryCivics of sodium is dropped into cold water or! Acid or dilute sulphuric acid ( c ) lead with dilute ‘ hydrochloric acid → answer: 2H → →! The dilute form is not used in the laboratory by the same.. ’ in the water that will produce some new product: Question.. In presence of nickel catalyst at 170°C observe when a piece of sodium dropped! Lighter than air ] denote: 2H ; H2 ; H+ on large! Do you observe when a piece of sodium is dropped into cold water are the ; products formed:! Hydrogen. ’ give reasons, petrolium products and organic substances lower end of the compounds compute! 2H → represents → 2 atoms of hydrogen excess lime ) is a Reversible Reaction. ” stoichiometry! It does not react with water to form water is hydrogen catalyst at 170°C to the Question ( grams #... Action of dil. some work here, pal the mass of # Na_2O + H_2O >! Represents → 1 molecule of hydrogen from metals Na2O + H2O -- >! Soluble and forms coating and stops the further reaction following equations: Al + NaOH + ____ → ____ ____... Hydrogen recombine to form iron and hydrogen gas: https: //tr.im/5yYXn be separated passage... Answer: Bosch process for large production of hydrogen: ( a ) as a fuel in the,! A Reversible Reaction. ” what is meant by this statement by this statement, petrolium products and organic substances liberating.

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