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40 MT CHEMISTRY: ICSE SEMESTER 1 SYLLABUS: CHAPTER: 4, 5, 6 ExtendedForms Id (skip this field) DO NOT EDIT this field or your score will not recorded. 94655e93-f49e-436c-9b30-3d237d501fc5 Mfmfmcmmkckckckckcmcmfkfmmffkfkfkkf Enter your correct name * Toufik Ali. Choose the correct answer Question 1:. Ammonium hydroxide is first added in a small quantity and then in excess to a solution of copper sulphate. The observation seen: 1 point A blue coloured precipitate will be formed which turns into a deep blue solution in excess ammonium hydroxide A white coloured precipitate will be formed which turns into a colourless solution in excess ammonium hydroxide A blue coloured precipitate will be formed which is insoluble in excess ammonium hydroxide A white coloured precipitate will be formed which is insoluble in excess ammonium hydroxide Question 2: The electrolysis of acidulated water is considered to be an example of catalysis, because: 1 point Sulphuric acid catalyses the ionization of water Sulphuric acid catalyses the dissociation of water Sulphuric acid is polar in nature Sulphuric acid is a non volatile acid Question 3: Hydroxide of this metal is soluble in sodium hydroxide solution: 1 point Potassium Zinc Gold Mercury Question 4: The gas evolved when zinc is heated with sodium hydroxide is: Hydrogen Oxygen Both No gas is formed 1 point Question 5: Which of the following differences between copper metal and copper sulphate solution is wrong: 1 point Copper metal conducts electricity in solid state but copper sulphate do not conduct electricity in solid state Current carrying particles in copper metal is free electrons but in copper sulphate, it is free atoms Both the options are wrong Both the options are correct Question 6: Sodium hydroxide solution is added to the solutions containing the ions mentioned in List X. List Y gives the details of the precipitate. Match the ions with their coloured precipitates: Ok (a). 1 and 2 in list X will match with: 1 point D and C respectively in list Y E and A respectively in list Y F and B respectively in list Y (b) 3 and 4 in list X will match with: 1 point D and C respectively in list Y E and A respectively in list Y F and B respectively in list Y (c) 5 and 6 in list X will match with: 1 point D and C respectively in list Y E and A respectively in list Y F and B respectively in list Y Question 7: During the electrolysis of copper (II) sulphate solution using platinum as cathode and carbon as anode, answer the following: Ok (a) What do you observe at the cathode and at the anode: 1 point Oxygen at cathode and copper at anode Copper at cathode and oxygen at anode Copper at cathode and no product at anode No product at cathode and Oxygen at anode (b) What change is noticed in the electrolyte: 1 point Blue colour of electrolyte fades Blue colour of electrolyte turns yellow Colorless electrolyte turns blue No change is observed (c) Cathode reaction is: Cu + 2e --> Cu Cu --> Cu + 2e OH - e --> OH SO - e --> SO 1 point (d) Anode reaction is: 1 point Cu + 2e --> Cu Cu --> Cu + 2e OH - e --> OH SO - e --> SO Question 8: An organic compound with vapour density = 94 containsC = 12.67%, H = 2.13% and Br = 85.11%. Find the molecular formula.[Atomic mass: C = 12, H = 1, Br = 80] 3 points C H Br C H Br C H Br C H Br Question 9: The gas evolved when Aluminum reacts with boiling concentrated caustic alkali solution is: Hydrogen Oxygen Sulphur dioxide Carbon dioxide 1 point Question 10: Ammonium hydroxide solution is added to lead nitrate solution: 1 point A white precipitate is formed which dissolves in excess A white precipitate is formed which does not dissolve in excess A dirty green precipitate is formed A reddish brown precipitate is formed Question 11: Sodium hydroxide solution is added to ferric chloride solution at first a little and then in excess: 1 point A white precipitate is formed which dissolves in excess A white precipitate is formed which does not dissolve in excess A dirty green precipitate is formed A reddish brown precipitate is formed Question 12: During electrolysis, cations migrate towards: Cathode Anode Inert electrode Active electrode 1 point Question 13: The vapour density of carbon dioxide [C = 12, O = 16]: 1 point 32 16 44 22 Question 14: Identify the weak electrolyte from the following: 1 point Sodium Chloride solution Dilute hydrochloric acid Dilute sulphuric acid Aqueous acetic acid Question 15: Which of the following metallic oxides can not be reduced by normal reducing agents: Magnesium oxide Copper(II) oxide Zinc oxide Iron(II) oxide 1 point Question 16: Ammonium hydroxide solution contains: 1 point Only ions Only molecules Both ions and molecules Only free electrons Question 17: Glucose solution is a/an: 1 point Strong electrolyte Weak electrolyte Non electrolyte Acidic solution Question 18: An aqueous electrolyte consists of the ions mentioned in the list, the ion which could be discharged most readily during electrolysis: Fe Cu Pb H 1 point Question 19: The metallic electrode which does pot take part in an electrolytic reaction: 1 point Cu Ag Pt Ni Question 20: The ion which is discharged at the anode during the electrolysis of copper 1 point sulphate solutions using copper electrodes as anode and cathode Cu OH SO H Question 21: When dilute sodium chloride is electrolysed using graphite electrodes, the cation is discharged at the catode most readily: Na OH H Cl 1 point Question 22. During silver plating of an article made up of iron using potassium argentocyanide as an electrolyte, the anode material should be 1 point Cu Ag Pt Fe Question 23: In a 5.6 dm cylinder, the mass of a certain gas and hydrogen are 12g and 1 point 0.5g respectively. What is the relative molecular mass of the gas: 12 24 36 48 Question 24: Find the total percentage of Magnesium in magnesium nitrate crystals, Mg(NO ) .6H O . [Mg = 24; N = 14; 0 = 16 and H = 1] 9 9.5 8 8.5 1 point Question 25:. State your observation when electricity is passed through molten lead bromide: 1 point Greyish metal at cathode, brown vapour at anode Greyish vapour at cathode, brown metal at anode Brown vapour at cathode, greyish metal at anode Brown metal at cathode, greyish vapour at anode Question 26:. To chemically distinguish calcium nitrate and zinc nitrate solution, we have to add to the solutions: 1 point Sodium hydroxide Ammonium hydroxide Either sodium hydroxide or ammonium hydroxide Neither sodium hydroxide nor ammonium Question 27:. Which of these will act as a non-electrolyte: Liquid carbon tetrachloride Acetic acid Sodium hydroxide solution Potassium hydroxide solution 1 point Question 28:. Identify the metallic oxide which is amphoteric in nature: 1 point Calcium oxide Barium oxide Zinc oxide Copper (II) oxide Question 29:. Which of the following is not a typical property of an ionic compound: 1 point High melting point Conducts electricity in the molten and in the aqueous solution state They are insoluble in water They exist as oppositely charged ions even, in the solid state Question 30:. The vapour density of a gas is 8. It's molecular mass is: 2 4 8 16 1 point Question 31:. A gas which does not conduct electricity in the liquid state but conducts electricity when dissolved in water: 1 point Hydrogen chloride Hydrogen Oxygen Chlorine Question 32:. Copper sulphate solution is electrolysed using copper electrodes.Study the diagram given below and answer the question that follows: Ok (a). Which electrode to your left or right is known as the oxidising electrode: Left electrode Right electrode Both left and right Neither left or right 1 point (b). The equation representing the reaction that occurs: 1 point Cu - 2e --> Cu Cu + 2e --> Cu OH - e --> OH H + e --> H (c). One appropriate observation for this electrolysis is: Blue colour of copper sulphate fades Formation of a highly flammable gas at cathode Decaying of anode Formation of a colourless gas at anode which is a supporter of burning This content is neither created nor endorsed by Google. Forms 1 point
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