9th Class Chemistry Past Paper 2022
Note: Chemistry 1st Time Paper of 9th Class.
Group-I (Subjective) 48 Marks
Part– I
Q.2 Write short answers to any FIVE (5) questions: (10 Marks)
(i) Define nuclear chemistry
(ii) Define the chemical formula
(iii) What is a polyatomic molecule? Give an example
(iv) Describe the electronic configuration of chlorine.
(v) Write any two properties of neutron particles.
(vi) Differentiate between groups and periods.
(vii) Why does ionization energy decrease in groups?
(viii) Define atomic radius.
Q.3 Write short answers to any FIVE (5) questions: (10 Marks)
(i) Define double covalent bond and give an example.
(ii) Write any two properties of ionic compounds.
(iii) What are synthetic adhesives?
(iv) Define pressure and write its unit.
(v) write tye name of two factors with affect on the boiling point of the liquid.
(vi) Why does evaporation increase with the increase of temperature?
(vii) what are hydrogen. write their name?
(viii) What is meant by “24-carat gold”?
Q.4 Write short answers to any FIVE (5) questions: (10 Marks)
(i) Write the formula used for the preparation of a molar solution.
(ii) Define solubility.
(iii) What type of solution is an alloy? Give an example.
(iv) Why does a test tube become cold when KNO₃ is dissolved in water?
(v) What is tin coating? Write its use.
(vi) Differentiate between an oxidizing and a reducing agent.
(vii) Name the by-products produced in Nelson’s cell.
(viii) What happens at the cathode in a galvanic cell?
PART-II
Note: Attempt any TWO (2) questions.
Q.5
(a) Describe Bohr’s Model in detail. (5 Marks)
(b) Describe any four properties of a compound. (4 Marks)
Q.6
(a) Define metallic bond. Explain it along with Diagram? (5 Marks)
(b) State Charles’ Law. Describe its with a mathematical expression. (4 Marks)
Q.7
(a) How will you prepare NaOH from brine in Nelson Cell. (5 Marks)
(b) Write four important chemical Properties of non-metals? (4 Marks)