9th Class Chemistry Past Paper 2024 Evening
Note: Chemistry 2nd 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. What is the scope of industrial chemistry?
ii. Which two elements exist in the liquid state? Write their names.
iii. How can isotopes be used for the treatment of cancer?
iv. Define a shell and a sub-shell.
v. Write any two salient features of the long form of the periodic table.
vi. What is meant by the law of octaves? Who put it forward?
vii. Write two objectives of Alchemy.
viii. Define ionization energy with an example.
Q.3 Write short answers to any FIVE (5) questions: (10 Marks)
i. Why do atoms react?
ii. Write two properties of ionic compounds.
iii. Differentiate lone pair and bond pair of electrons.
iv. Why are gases compressible?
v. Evaporation causes cooling. Give reason.
vi. What is the difference between a saturated and an unsaturated solution?
vii. What do you mean by v/v % concentration unit?
viii. Why do suspensions and solutions not show the Tyndall effect?
Q.4 Write short answers to any FIVE (5) questions: (10 Marks)
i. Define alloy with an example.
ii. Write two methods for the prevention of corrosion.
iii. How does electroplating of tin take place?
iv. Define oxidation number.
v. Name four least reactive metals.
vi. How are non-metals essential for the existence of life?
vii. Write any two uses of sodium.
viii. What is the difference between alkali and alkaline earth metals?
PART-II
Note: Attempt any TWO (2) questions.
Q.5
(a) How to write a chemical formula? Explain with suitable examples. (5 Marks)
(b) Write a note on the dative covalent bond with one example. (4 Marks)
Q.6
(a) Give five differences between Rutherford’s atomic theory and Bohr’s atomic theory. (5 Marks)
(b) State Charles’ law. Explain it along with a mathematical expression. (4 Marks)
Q.7
(a) Discuss the rules for assigning oxidation numbers. (5 Marks)
(b) What is a supersaturated solution? How is it prepared? (4 Marks)