9th Class Chemistry Past Paper 2024
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. Differentiate free radical and molecular ion.
ii. Soft drink is a mixture and water is a compound. Justify.
iii. What are the defects of Rutherford’s atomic model?
iv. Write down any two properties of cathode rays.
v. Define electronegativity. Which element has the highest value of electronegativity?
vi. Why are the elements called S and P block elements?
vii. Why does the size of atoms decrease in a period?
viii. What is meant by effective nuclear charge?
Q.3 Write short answers to any FIVE (5) questions: (10 Marks)
i. Write the importance of electronic configuration of noble gases.
ii. What is the effect of intermolecular forces on boiling point?
iii. Write the electronegativity values of H and Cl atoms.
iv. Differentiate diffusion and effusion.
v. How is boiling point related to vapour pressure of a liquid?
vi. Define molarity. Write its formula.
vii. Define endothermic reaction.
viii. Why do colloids show the Tyndall effect?
Q.4 Write short answers to any FIVE (5) questions: (10 Marks)
i. Define reducing agent with an example.
ii. Calculate the oxidation state of nitrogen in Cu(NO₃)₂.
iii. What is the advantage of galvanizing?
iv. Justify that the given reaction is a redox reaction:
2Na + Cl₂ → 2NaCl
v. Write down any two uses of magnesium.
vi. Why is gold not used in pure form?
vii. Write down the name of any four halogens.
viii. How does methane react with chlorine in bright sunlight?
PART-II
Note: Attempt any TWO (2) questions.
Q.5
(a) Write five differences between a mixture and a compound. (5 Marks)
(b) How is a coordinate covalent bond formed? Explain it with the help of two examples. (4 Marks)
Q.6
(a) What are isotopes? Describe isotopes of carbon, hydrogen, and chlorine. (5 Marks)
(b) Write down any four typical properties of gases. (4 Marks)
Q.7
(a) Explain the construction and working of the Daniel Cell. Draw a diagram also. (5 Marks)
(b) Discuss the effect of temperature on solubility. (4 Marks)