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ICSE Class X Prelims 2020 : Chemistry (Don Bosco School, Park Circus, Kolkata)

4 pages, 15 questions, 10 questions with responses, 10 total responses,

Rakshak Awasthi
Don Bosco School, Park Circus, Kolkata

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SHARADA MANDIR SCHOOL STD : 10 FIRST TERM EXAM AUG 2017 Marks: 80 Time: 2Hrs CHEMISTRY Instructions: 1. The first 15 minutes is to be spent on reading the question paper. 2. The time given on the head of the paper is the time allowed for writing the answers. 3. Section A is compulsory. Attempt any four questions from section B 4.The intended marks for questions or parts of questions are given in brackets. 5. Section B is to be started on a fresh side of the supplement. 6. Copy the grid given for the Q. No and marks given in the beginning of Section B Section A (Attempt all questions) Question 1 A] Fill in the blanks. [Write only the answers] [5] 1) The gas given off at cathode during the electrolysis of acidulated water is _______.(oxygen , hydrogen) 2) Calcium salts with sodium hydroxide to give _______ coloured precipitate. (brick red, white) 3) The number of atoms present in one molecule of an element is called its ________. (atomicity, atomic number) 4) A non-metal in group 17, which is liquid is _________. (mercury, bromine) 5) A term that represents how many times an atom of an element is heavier than th mass of carbon atom. (atomic weight, molecular weight) C] Give one word/ Phrase for the following. 1) Homologous series of hydrocarbons with general formula CnH2n. 2) A chloride which gives reddish brown precipitate with sodium hydroxide solution. 3) The largest atom in the third period. 4) Impurities which remain behind at the bottom of the cell during electrorefining. 5) Solution obtained by dissolving sulphur trioxide in 98% sulphuric acid. [5] D] Draw the structural formula for the following compounds. 1) 4 methyl pentan 1 ol 2) 2, 2 dimethyl butane [2] E) The following questions are about electroplating a copper wire with silver. 1) What ions must be necessarily present in the electrolyte? 2) Of what substance must the anode be made up of? 3) What will be the cathode made up of? [3] F. 1] Write balanced chemical equations for the following reactions. a) A mixture of acetylene and hydrogen is passed over nickel at 300oC. b) Zinc metal is heated with dilute sulphuric acid. [2] 2] Complete the following equations and balance. a) CaC2 + H2O [3] Te st Pa p er z. co m B] Choose the correct answer from the options given below. [5] 1) The functional group present in acetic acid is: a) ketone b) alcohol c) aldehyde d) carboxylic acid 2) A gas which has an offensive smell like rotten eggs. a) oxygen b) hydrogen c) hydrogen sulphide d) ammonia 3) On moving from left to right across a period of the periodic table, the non-metallic character of the elements: a) decreases b) increases c) remains the same d) depends on the period 4) The vapour density of carbon dioxide [C= 12, O= 16] is : a) 12 b) 16 c) 44 d) 22 5) The number of C H bonds in ethane molecule are: a) four b) six c) eight d) ten b) C2H5OH + CH3COOH c) C2H5OH + Na Cont d.... 1 www.testpaperz.com

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