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ICSE Class X Board Exam 2014 : Chemistry with Model Answers

19 pages, 88 questions, 88 questions with responses, 136 total responses,

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CHEMISTRY SCIENCE Paper - 2 II. ANALYSIS OF PERFORMANCE Question 1 (a) Choose the correct answer from the options given below: (i) Ionisation Potential increases over a period from left to right because the: (A) Atomic radius increases and nuclear charge increases (B) Atomic radius decreases and nuclear charge decreases (C) Atomic radius increases and nuclear charge decreases (D) Atomic radius decreases and nuclear charge increases. (ii) A compound X consists of only molecules. Hence X will have: (A) A crystalline hard structure (B) A low melting point and low boiling point (C) An ionic bond (D) A strong force of attraction between its molecules. (iii) When fused lead bromide is electrolysed we observe: (A) a silvery grey deposit at anode and a reddish brown deposit at cathode (B) a silver grey deposit at cathode and a reddish brown deposit at anode (C) a silver grey deposit at cathode and reddish brown fumes at anode (D) silver grey fumes at anode and reddish brown fumes at cathode. (iv) The main ore used for the extraction of iron is: (A) Haematite (B) Calamine (C) Bauxite (D) Cryolite (v) Heating an ore in a limited supply of air or in the absence of air at a temperature just below its melting point is known as: (A) smelting (B) ore dressing (C) calcination 153

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Additional Info : ICSE 2014 - Board Model Answers, Marking Scheme & Examiner Comments for CHEMISTRY
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