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ICSE Class IX Sample / Model Paper 2026 : Biology

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Bangabasi College, Kolkata
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ICSE Class 9 Chemistry Examination Question Paper Time: 1 Hour Marks: 35 Section I (20 Marks) Question 1 Choose the correct answer from the options given: [1 10 = 10] (a) The symbol for the sulphate radical is: (i) SO (ii) SO (iii) S (iv) SO (b) Atomic number of an element is equal to the number of: (i) protons (ii) neutrons (iii) electrons + protons (iv) electrons + neutrons (c) The electronic configuration of sodium (atomic number 11) is: (i) 2,8,1 (ii) 2,7 (iii) 2,8,2 (iv) 2,9 (d) Isotopes differ in the number of: (i) protons (ii) electrons (iii) neutrons (iv) nucleons (e) The bond formed by sharing of electrons is: (i) electrovalent (ii) covalent (iii) coordinate (iv) metallic (f) According to Boyle's law, at constant temperature: (i) PV = constant (ii) V/T = constant (iii) P/T = constant (iv) V T (g) The absolute temperature of 27 C is: (i) 200 K (ii) 273 K (iii) 300 K (iv) 373 K (h) STP conditions are: (i) 0 C and 1 atm (ii) 273 K and 760 mm Hg (iii) 25 C and 760 torr (iv) 298 K and 1 bar (i) Fractional atomic mass of chlorine is due to: (i) isotopes (ii) isobars (iii) isotones (iv) isomers (j) In Charles' law graph (V vs T), the line passes through: (i) origin (ii) -273 C (iii) 0 K (iv) 273 K Question 2 (a) Write the chemical formula of: (i) magnesium nitrate (ii) aluminium sulphate (b) State Dalton's atomic theory in two points. (c) Define valence electrons. (d) What is the nature of charge on cathode rays? (e) Convert 37 C to Kelvin scale. (f) State Gay-Lussac's law of gases. (g) Draw electron dot structure for NaCl. (h) Calculate volume of gas at 2 atm if at 1 atm it is 5 L (constant T). Section II (15 Marks) Question 3 (a) Explain symbols in a balanced equation with examples (s, l, g, aq). (b) State three postulates of Bohr's model of atom. (c) An element has atomic number 13 and mass number 27. Find: protons, neutrons, electrons. Electronic configuration? (d) Differentiate electrovalent and covalent bonds with one example each. Draw orbit structure for MgCl . Question 4 (a) What observation in Rutherford's experiment led to nucleus discovery? (b) Explain why isotopes have same chemical properties but different physical. Give chlorine example ( Cl and Cl). (c) Atom X (2,8,7) + Y (2,1). Name bond type, write formula, reason. [1 ] (d) Draw atomic structure of O and O ion. Question 5 (a) State Charles' law. What is absolute zero? (b) A gas occupies 300 ml at 27 C. Find volume at 127 C (constant P). (c) Explain Boyle's law with graph. (d) 500 ml gas at STP. Find volume at 27 C, 1 atm. (e) Correct the statement: "Volume is inversely proportional to pressure at constant volume."

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