9th Class Chemistry Past Paper 2022 Evening
Note: Chemistry 2nd Time Paper of 9th Class.
Group-II (Subjective) 48 Marks
Part– I
Q.2 Write short answers to any FIVE (5) questions: (10 Marks)
(i) Differentiate between organic and inorganic chemistry.
(ii) Define physical and nuclear chemistry.
(iii) Which gases are most abundant in the air? Write any four names.
(iv) How was it proved that the whole mass of an atom is located in its center?
(v) How are anode rays formed from the gas present in the discharge tube?
(vi) How did Newlands arrange the elements?
(vii) Define atomic radius. What are the SI units of atomic radius?
(viii) What are transition metals?
Q.3 Write short answers to any FIVE (5) questions: (10 Marks)
(i) How is a coordinate covalent bond formed in NH₄⁺ ion?
(ii) Define intermolecular forces and give an example.
(iii) Write two differences between polar and non-polar compounds.
(iv) Convert 750°C to K and 100 K to °C.
(v) State Charles’ law.
(vi) What is the difference between evaporation and condensation?
(vii) Write two important chemical properties of platinum.
Q.4 Write short answers to any FIVE (5) questions: (10 Marks)
(i) Differentiate between solute and solvent.
(ii) What is the mass/mass %?
(iii) What are colloidal solutions?
(iv) How does a saturated solution become a supersaturated solution?
(v) Define an oxidation reaction.
(vi) Which are strong electrolytes?
(vii) What is the basic function of a salt bridge?
(viii) What is alloying?
PART-II
Note: Attempt any TWO (2) questions.
Q.5
(a) Write down any five properties of cathode rays. (5 Marks)
(b) Write a note on any four branches of chemistry. (4 Marks)
Q.6
(a) Explain hydrogen bonding with an example. (5 Marks)
(b) Describe the experimental verification of Charles’ law. (4 Marks)
Q.7
(a) Write any three rules for assigning oxidation numbers. (5 Marks)
(b) Write four physical properties of metals and non-metals. (4 Marks)