9th Class Chemistry Past Paper 2018 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) Define physical chemistry.
(ii) Write the chemical formula of water and sugar.
(iii) Define mixture with an example.
(iv) What is the nature of charge on the cathode?
(v) How is U-235 used for power generation?
(vi) Define electronegativity with an example.
(vii) Define Shielding Effect.
(viii) What is the trend of electron affinity in a group and period?
Q.3 Write short answers to any FIVE (5) questions: (10 Marks)
(i) Differentiate between donor atom and acceptor atom.
(ii) Define a single covalent bond with an example.
(iii) What is meant by coordinate covalent compounds?
(iv) Define a melting point.
(v) Evaporation causes cooling, why?
(vi) Identify as colloids and suspensions from the following: Paints, jelly, milk, and chalk in water.
(vii) Define an unsaturated solution.
(viii) Write the name of two non-polar solvents.
Q.4 Write short answers to any FIVE (5) questions: (10 Marks)
(i) Define reduction on the basis of electron and give an example.
(ii) Define non-electrolytes and give examples.
(iii) Where do the electrons flow from Zn electrode in Daniel Cell?
(iv) Write the redox reaction taking place during the electroplating of chromium.
(v) Write down any two physical properties of metals.
(vi) Write down the names of Nobel metals.
(vii) Describe the non-metallic character in a group and period of the periodic table.
(viii) In bright sunlight, how does Clâ‚‚ and CHâ‚„ react?
PART-II
Note: Attempt any TWO questions.
Q.5
(a) Write five differences between Rutherford’s atomic theory and Bohr’s atomic theory. (4 Marks)
(b) Describe four types of molecules with examples. (5 Marks)
Q.6
(a) What is a chemical bond? Why do atoms form chemical bonds? (4 Marks)
(b) State Charles’s Law. Derive its mathematical formula. (5 Marks)
Q.7
(a) What is oxidation state or oxidation number? Write its any four rules. (4 Marks)
(b) Write any four characteristics of suspension. (5 Marks)