M. Schlecht, R. Meyer, in Concentrating Solar Power Technology, 2012 Water-steam cycle. [10], (d) State your observation for the following cases: [5], (e) Match the column A with column B. A is sodium chloride solution which is a strong electrolyte which contains only ions. (iii) Ammonium chloride is heated with sodium hydroxide. The most common method for creating graphite oxide in the past has been the Hummers and Offeman method, in which graphite is treated with a mixture of sulphuric acid, sodium nitrate and potassium permanganate (a very strong oxidiser). Question 3: (a) Draw the structural formula for each of the following: (i) Ethanoic acid        (ii) But-2-yne. Glass rod dipped in ammonium hydroxide is brought near the mouth of the concentrated hydrochloric acid bottle. This would be called neutralisation, if you take the equivalent amount of both components. Valency of O is -2 because it can accept two electrons. A chemical equation consists of formulae of reactants connected by plus sign (+) and arrow (→) followed by the formulae of products connected by plus sign (+). 10, select the correct answer from the choices A, B, C and D which are given. For this electroplating: (i) Name the electrolyte (ii) Name the cathode (iii) Name the anode (iv) Give the reaction at the cathode (v) Give the reaction at the anode. On my youtube channel, I am covering two methods. Question 7: (a) The diagram shows a simple arrangement of the fountain experiment: (c) The action of heat on the blue crystaline solid L gives a reddish brown gas M, a gas which re-lights a glowing splint and leaves a black residue. for the higher valency, use the suffix -IC at the end of the name of the metal. Potassium nitrate, aluminium and sulfur. Sulfur (in traditional lay Commonwealth English: sulphur) is a chemical element with the symbol S and atomic number 16. (iv) Lead chloride from lead carbonate (two equations). summary, 2012) (Sulphuric acid MARKET ANALYSIS, 2012) ... (potassium nitrate) in the 17 th. The electrolytic cell C contains sugar solution and the bulb does not glow. [2]. (iv) Give the equation for the manufacture of ammonia. **, A particular solution contains molecules and ions of the. [5]. The compound which is responsible for the green coloration when sulphur dioxide is passed through acidified potassium dichromate solution. Question 5: (a) Name the main constitutent metal in the following alloys: (b) An element has an atomic number 16. Since there is a 1:1 ratio of sulfuric acid and lithium salts, the moles of lithium salt formed will be 0.03 moles. Letter Writing | Letter Writing Types, How To Write?, Letter Writing Tips, NAC Certificate | How to Apply? (ii) correct item from B matching ammonium ion, and so on. This time is to be spent in reading the Question Paper. (iii) What is your observation? The compound responsible for the brown ring during the brown ring test of nitrate ion. Sodium chloride has two radicals. (b) Relative molecular mass of Ca3(PO4)2 = (40.07 × 3) + (30.9 × 2) + (16 × 8) = 120.21 + 61.8 + 128 = 310.01 310.01 g Ca3(PO4)2 contains 61.8 g P So, 100 g Ca(H2PO4)2 contains (IMAGE) The % of P in Ca(H2PO4)2 is 19.93%. Lithium oxide and sulphuric acid reacts to form lithium sulphate and water. It represents the number of times an atom is heavier than one atomic mass unit (amu) taken as a standard. Who We Are. Here, one molecule of zinc and one molecule of sulphuric acid react to give one molecule of zinc sulphate and one molecule of hydrogen. 1 – (c). (i) Sulphur is heated with concentrated sulphuric acid. Electrolytic cell B contains acetic acid solution and in this case the bulb in the circuit glows dimly. You will not be allowed to write during the first 15 minutes. Varieties of LPG are marketed including a mixture of propane (60%) and butane (40%). Where previous production had mainly been lab . Oxalic acid is one of the most powerful of the organic acids and expels carbonic acid and many other acids from their salts. Format and Samples. Solution 15. Symbol represents _____ atom(s) of an element. Valency of Na is +1 because it can lose one electron. hydrochloric acid. century (History of Sulfuric Acid, 2012) . Answer. The time given at the head of this Paper is the time allowed for writing the answers. While tensile strength, 0.2% proof strength, hot strength, solidus and liquidus temperature and corrosion resistance increase with nickel … SECTION-I  (40 Marks) (Attempt all questions from this Section), Question 1: (a) From the list given below, select the word(s) required to correctly complete the blanks (1) to (5) in the following passage: Note: words chosen from the list are to be used only once. Solution 17. Solution 16. Solution: 2K 2 Cr 2 O 7 + 8H 2 SO 4 → 2K 2 SO 4 + 2Cr 2 (SO 4) 3 + 8H 2 O + 3O 2. If 9 g of water is decomposed we get 1 g of hydrogen and 8 g of oxygen. Acid rain increases nitrate levels in soil, ... changing air to fuel ratio . Solving the ratio: x = 0.0354 x 74/73 = 0.03588 g Ca(OH) 2 (d) What is the concentration of calcium hydroxide in g/dm 3?. Question 6: (a) Give the equation for the preparation of each of the following salts from the starting material given. Webinar Certificate | Template, Sample and How To Write Webinar Certificate? (i) Copper sulphate from copper(II) oxide. Reaction of paraformaldehyde and ammonium nitrate in glacial acetic acid resulted in the isolation of hexamine dinitrate. This composition, usually in a ratio of 5 parts potassium nitrate, to 3 parts aluminum powder, to 2 parts sulfur, is especially popular with hobbyists. Urea is one of the main chemicals applied in the printing process of the reactive dyes, causing a high pollutant load. Combustion reactions can be represented as: [5] (ii) Calculate the percentage of nitrogen and oxygen in ammonium nitrate. Nickel has a significant effect on the physical and mechanical properties of Cu-Ni alloys (see 2.). It produce dense white fumes of ammonium chloride. Name the two gases you have studied which can he used in this experiment. 24 g of magnesium reacts with 2(1 + 35.5) = 73 g of hydrochloric acid to produce (24 + 71), i.e. (f) Write the equation for each of the following reactions: [5] (i) Sulphur is heated with concentrated sulphuric acid. (ii) In what ratio must the reactants be taken? [reddish brown, ammonium, nitrogen dioxide, hydroxyl, dirty green, ammonia, acidic, alkaline] Nitrogen and hydrogen combine in the presence of a catalyst to give (1) ………… gas. ppt obtained with dil. So more electricity is conducted and bulb glows brightly. molecular mass of. (v) What is the procedure for converting the product of (b) (iv) back to A? (v) How many moles of HCl are used in this reaction? Demineralized water is required for the water-steam cycle due to the nature of steam production. C is sugar solution which is a non electrolyte that is it does not contain ions so electricity is not conducted and bulb does not glow. Oxalic acid occurs in the cell sap of Oxalis and Rumex species of plants as the potassium and calcium salt. [5], (i) Aqueous solution of Nickel Sulphate with few drops of dil. (a)  Relative molecular mass of Ca(H2PO4)2 = 40.07 + (1 × 4) + (30.9 × 2) + (16 × 8) = 40.07 + 4 + 61.8 + 128 = 233.87 233.87 g Ca(H2PO4)2 contains 61.8 g P So, 100 g Ca(H2PO4)2 contains The % of P in Ca(H2PO4)2 is 26.42%. Format and Samples. National Trade Certificate, Verification, SSI Certificate | SSI Registration, Udyam Registration, Eligibility, Benefits, Validity, 8+ Sample Letter of Error | Format, Samples and Examples of Error Letter, 10+ Sample Letter of Credit | Format, Template and Examples of Letter of Credit. Write the balanced chemical equations of the following reactions. The acidic water discharged from the cation exchange unit then enters the anion exchange unit containing anion exchange resin in the base from where the acidic ions are absorbed. It is abundant, multivalent and nonmetallic.Under normal conditions, sulfur atoms form cyclic octatomic molecules with a chemical formula S 8.Elemental sulfur is a bright yellow, crystalline solid at room temperature. Ammonia gas is burnt in an atmosphere of oxygen in the absence of a catalyst. 3. State: (c) Solution A is a sodium hydroxide solution. potassium dichromate + sulphuric acid → potassium sulphate + chromium sulphate + water + oxygen. Extractive metallurgy and changing the combustion . Relative molecular mass of KClO3 = 39.09 + 35.5 + (3 × 16) = 122.59 g The percentages of K, Cl and O in KClO3 are 31.9%, 28.9% and 39.1%, respectively. So less electricity is conducted and bulb glows dimly. 1.3 Effect of alloying elements. (i) Identify A and B. Hydrogen produced at STP is 22.4 litres. Magnesium reacts with hydrochloric acid to form magnesium chloride and hydrogen gas. Section I is compulsory. [5]. (v) Magnesium sulphate solution is mixed with barium chloride solution. Webinar Certificate | Template, Sample and How To Write Webinar Certificate? Formula of iron (ill) carbonate is _____ . liberate sulphur dioxide from sodium sulphite. A compound which liberates reddish brown gas around the anode during electrolysis in its molten state is: An organic compound undergoes addition reactions and gives a red colour precipitate with ammoniacal cuprous chloride. Moles of sulphuric Acid = 15*2/1000 ( moles = Concentration X Volume)= 0.03 moles. Sodium is a _____ radical while chloride is _____ radical. (iii) What is the volume of carbon dioxide liberated at stp? Relative molecular masses of different substances, i.e. Ores and minerals Commonly occurring ores and minerals of iron, copper, tin, lead, magnesium, aluminium, zinc and silver. [5]. ions and (4) ………….. ions. Symbol represents gram atom(s) of an element. (iii) Potassium sulphate from potassium hydroxide solution. 8 . a. Sulphuric acid is a strong acid, which is widely used for pH control purposes as a neutralising agent. [1]. [5]. Question 8(p). There are quite a few ways to make nitric acid at laboratory conditions. (iv) Name (not formula) the compound formed when steam reacts with A in the presence of phosphoric acid. This process produces acid at the concentration of above 90%. [5], (b) Compound A is bubbled through bromine dissolved in carbon tetrachloride and the product is CH2Br – CH2Br. Electronegativity across a period – Increases. Sulphuric acid. (iii) Ammonium chloride is heated with sodium hydroxide. **, Dry red rose petals are placed in the jar of sulphur dioxide. B = Sodium chloride. (iv) What mass of calcium chloride is formed? Sodium chloride has two radicals. 4. (c) For part (c). (ii) 1 part of nitrogen gas and 3 parts of hydrogen gas. (A) Nitroso Iron(II) sulphate (B) Iron(III) chloride (C) Chromium sulphate (D) Lead(II) chloride (E) Sodium chloride. Check whether it is balanced, if not balance it. (iii) Bring a glass rod dipped in ammonium hydroxide near the mouth of the gas jar, it forms dense white fumes of ammonium chloride. (i) Write the equations for the reaction. (iii) Name the catalyst used. Give a reason for each of these observations. The lead content on the skin surface of 10 lead-battery workers was measured by the method of skin stripping, and urinary lead content of rats was measured with epicutaneous application of four lead compounds: lead sulfate, lead oxide, lead powder, and lead stearate.There were significant amounts of lead on the 9th and 10th skin strippings of the dorsal hand and the back of lead workers. Sample Delegation Letters | Format, Samples, Examples and How To Write Sample Delegation Letter? Substances take part in a reaction, and substances are formed as a result of the reaction. (g) (i) LPG stands for liquefied petroleum gas. (v) Ammonia can act as a reducing agent – write a relevant equation for such a reaction. What is the common property demonstrated by this experiment. (iii) How would you check whether or not the gas jar is filled with hydrogen chloride? (i) Identify L, M and N (Name or formula) (ii) Write the equation for the action of heat on L. (iii) Write the equation for the reaction between the solution of L and the gas N. [5], ICSE Previous Year Question Papers Class 10, ICSE Class 10 Chemistry Previous Years Question Papers, Concise Mathematics Class 10 ICSE Solutions, Concise Chemistry Class 10 ICSE Solutions, Concise Mathematics Class 9 ICSE Solutions, SADAREM Certificate | Application Process, Format, Result and Application Status, Trademark Certificate | Application and Registration Process, Documents Required and Trademark Symbols. Requisition Letter | Meaning, How to Write? When gas N, which has a rotten egg smell, is passed through a solution of L a black precipitate is formed. Write only the answers. [5], (c) Three different electrolytic cells A, B and C are connected in separate circuits. The intended marks for questions or parts of questions are given in brackets [ ]. Q7 A 50.0 cm 3 sample of sulphuric acid was diluted to 1.00 dm 3. It is not very quick-burning unless exceptionally fine ingredients are used. sulphuric acid during the production of . (ii) Zinc oxide is treated with sodium hydroxide solution. Solution B is a weak acid. (iv) What does the method of collection tell you about the density of hydrogen chloride? 95 g of magnesium chloride. (iv) Collection of HCl ↑ by upward displacement of air proves that HCl ↑ is denser than air. Ammonium ion – Covalent and Co-ordinate bond. Li2O (s) + H2SO4 (aq) = Li2SO4 (aq) + H2O (l) . Question 4: (a) 4.5 moles of calcium carbonate are reached with dilute hydrochloric acid. (d) Add silver nitrate solution. one molecule of sulphuric acid contains two atoms of hydrogen, one atom of sulphur and four atoms of oxygen. Eg :- Water ( H2O) always contains two elements hydrogen and oxygen combined together in the same ratio of 2:16 or 1:8 by mass. Oxalis and Rumex species of plants as the HTF ratio of Sulfuric acid, which is sodium. Compound formed when steam reacts with a in the same ratio of Sulfuric acid and lithium salts, the of! Is complete a bulb in the cell sap of Oxalis and Rumex of. 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