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ICSE Class IX Mid-term 2022 : Chemistry (The Frank Anthony Public School (FAPS), Bangalore)

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Aditya Chakraborti
The Frank Anthony Public School (FAPS), Bangalore
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THE FRANK ANTHONY PUBLIC SCHOOL, BENGALURU HALF YEARLY EXAMINATION, SEPTEMBER 2021 SUB: CHEMISTRY DURATION: 2 HRS + 15 MIN CLASS : 9 MARKS: 80 This question paper consists of 5 printed pages Class 9B and 9C to email the answer scripts to rageshchemfaps@gmail.com Class 9A to email the answer scripts to sheebabhaskar3@gmail.com Section A (Answer all the questions) Question 1 a. Choose the correct option from the following: (10) (i) In a double decomposition reaction, when an acid and base gives salt and water,2 there is an interchange ofA. Atoms B. Radicals C. Molecules D. None of these (ii) The product formed when sulphur dioxide dissolves in water A. Sulphuric acid B. Sulphurous acid C. Sulphur dioxide D. Pyrosulphuric acid (iii) Sodium hydroxide is a/an A. Acid B. Base C. Hydrocarbon D. Alcohol (iv) The chemical formula of Aluminium oxide is A. AlO B. Al3O4 C. Al2O3 Page | 1 D. AlO2 (v) 2AgCl 2Ag + Cl2 is an example of A. Electrolytic decomposition B. Thermal decomposition C. Photochemical decomposition D. Double decomposition (vi) Iron has a variable valency of A. 1 and 2 B. 1 and 3 C. 2 and 3 D. 2 and 4 (vii) Valency of carbonate is A. +1 B. -2 C. +2 D. -2 (viii) Molecular weight of sulphuric acid is ( H =1, S = 32, O = 16) A. 96 B. 46 C. 98 D. 100 (ix) At constant temperature, the volume of a gas is inversely proportional to its pressure A. Boyle's law B. Charles law C. Gas equation D. None of the above (x) The space occupied by a fixed mass of gas is called A. Pressure B. Temperature C. Volume Page | 2 D. Mass b. Write the chemical formula for the following: (5) 1. Zinc nitrate 2. Aluminium chloride 3. Magnesium sulphate 4. Iron (III) oxide 5. Potassium carbonate c. Fill in the blanks: (10) 1. Isotopes have same ________ and different ________ 2. Variable valency is due to loss of electrons from the _________ shell 3. The symbol of ammonium radical _____ , its valency is _______ 4. The isotopes of hydrogen are _______ , __________ and ______ 5. The valency of magnesium is Mg3N2 is _________ 6. 200K in (Celsius) is ___________ d. Give reasons for the following: (5) (i) Chest burn is relieved with antacid (ii) Atomic mass of chlorine is a fraction (iii) Isotopes have similar chemical properties (iv) Gases are highly compressible (v) Helium is chemically inert e. Match the following: List 1 A) Boron B) Potassium C) valency of Cu D) Argon E) Sulphur f. Give equations for the following: (5) List 2 1)non metal 2) noble gas 3) metal 4) Metalloid 5) 1 and 2 (5) 1. Zinc carbonate is heated 2. Carbon dioxide dissolves in water 3. Iron reacts with chlorine gas Page | 3 4. Ammonium chloride is heated 5. Sodium hydroxide reacts with hydrochloric acid Section B (Answer any 4 questions) Question 2 Differentiate between the following: (10) 1. Exothermic and endothermic reaction 2. Photochemical and electrochemical decomposition 3. Precipitation and neutralization reaction 4. Duplet and octet rule 5. Atomic number and mass number Question 3 a. Balance the following equations: 1. N2 + H2 (5) NH3 2. Br2 + H2S HBr + S 3. Fe + H2O Fe2O3 + H2 4. Na + H2O NaOH + H2 5. KOH + CO2 K2CO3 + H2O b. Define isotopes? Explain taking chlorine as an example. (4) c. What is absolute zero? (1) Question 4 Copy and complete the table. Element Sodium Fluorine Aluminium Mass number 23 19 27 (10) Atomic number Number Number of of protons electrons 11 11 13 13 Number of neutrons Electronic configuration 10 Page | 4 Question 5 (3+3+4) 1. 450 ml of oxygen gas is taken at 27 . If the volume is reduced to one third find the temperature of the gas keeping pressure constant. 2. A certain mass of chlorine gas is taken at a pressure of 1200mm of mercury. When the pressure of the gas is doubled the volume is found to be 500 cm3 . Find the initial volume of the gas (temperature constant) 3. A gas occupies a volume of 700 ml at STP. Find the volume of the gas at 400 mm of Hg pressure kept at 15 Question 6 a. Name the gas evolved in the following: (5) 1. Magnesium reacts with hydrochloric acid 2. Zinc carbonate is heated 3. Potassium nitrate is heated 4. Nitrogen gas reacts with hydrogen gas 5. Sulphur reacts with oxygen gas b. Mention any two-information provided by the chemical equation and three limitations of a chemical equation (2+3) ********************************************************************* Page | 5

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