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GOLDCREST HIGH-LATUR ON THE WINGS OF EXCELLENCE PRELIM-02 SUBJECT:-CHEMISTRY TIME: 2 HOURS DATE:- GRADE-10 MARKS:80 General Instructions Answers to this paper must be written on the paper provided separately. You will not be allowed to write during the first 15 minutes. This time is to be spent in reading the question paper. The time given at the head of the paper is the time allotted for writing the answers. Attempt all questions from Section I and any four questions from Section II. The intended marks of questions or parts of questions are given in brackets [ ]. SECTION-I(40 Marks) Question-01 (a) Select correct answer from A, B, C and D write only the letter corresponds to correct answer : [10] (i) The basicity of acetic acid is a) 1 b) 2 c) 3 d) 4 (ii) A salt prepared by simple displacement reaction, i.e. action of dil acid on metal is a) PbCl 2 b) CuCl2 c) AgCl3 d) HgCl (iii) A covalent compound which in aqueous state conduct electricity. a) CCl 4 b) CS2 c) NH3 d) C2H4 (iv) A metal whose hydroxide does not decompose on heating but its nitrate decompose is a) Calcium b) Aluminium c) Sodium d) Iron. (v) The oxidized product obtained on reaction of H2S gas with dil HNO is .. a) Sulphur dioxide b) Sulphur c) Sulphuric acid d) Sulphurous acid (vi) Metals lose electrons during ionization. This change is called a) Oxidation b) Reduction c) Redox d) Displacement (vii) The aqueous solution of the compound which contains both ions and molecules. a)Sulphuric acid b) Hydrochloric acid c) Nitric acid d) Acetic acid (viii) Ethyne gas when pass through ammonical cuprous chloride. It produce :a) White precipitate b) Red precipitate (c) Dirty green precipitate d)Reddish brown precipitate (ix) Number of hydrogen atom present is acetic acid. a) 2 b) 3 c) 4 d) 5 (x) The gas law which relates the volume of gas to the number of molecules of the gas is a) Avogadro s law b) Gay Lussac s law c) Boyle s law d) Charle s law (b) How will you distinguish each of the following compound by a chemical test : [5] i) Sodium Sulphate and Sodium Sulphide ii) Copper hydroxide and Lead hydroxide iii) Acetylene and ethylene iv) Ferrous sulphate and Ferric sulphate v) Nitric acid and sulphuric acid (c) Name the method used to prepare the following salts : i) Lead sulphate iii) Iron (II) chloride [5] ii) Soduim chloride iv) Zinc sulphate v) Copper chloride (d) Give appropriate scientific reasons for the following statements: [5] i)Zinc oxide can be reduced to zinc by using carbon monoxide,but aluminium oxide can not be reduced by a reducing agent (ii) Carbon tetrachloride does not conduct electricity. (iii)During electrolysis of molten lead bromide graphite anode is preferred to other electrodes, (iv) The electrical conductivity of acetic acid is less in comparison to the electrical conductivity of dilute sulphuric acid (v) Electolysis of molten lead bromide is considered to be a redox reaction
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