9th Class Chemistry Past Paper 2019 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 organic chemistry.
(ii) Write the names of two elements discovered in early ages.
(iii) What is a homoatomic molecule? Give an example.
(iv) What are canal rays?
(v) What is meant by quantum and quanta?
(vi) How did Newlands arrange the elements?
(vii) Write down the names of the elements of the first period.
(viii) What is electron affinity? Give an example.
Q.3 Write short answers to any FIVE (5) questions: (10 Marks)
(i) Why does a covalent bond become polar?
(ii) Describe at least two necessary conditions for the formation of a covalent bond.
(iii) Differentiate between lone pair and bond pair of electrons.
(iv) What do you mean by volume/volume %? Also, give one example.
(v) Define the term allotropy with examples.
(vi) Define suspension with an example.
(vii) Why is water called a universal solvent?
(viii) Define true solution with an example.
Q.4 Write short answers to any FIVE (5) questions: (10 Marks)
(i) What is meant by strong electrolytes? Give one example.
(ii) Why is galvanizing done?
(iii) What is the difference between valency and oxidation state?
(iv) Define oxidation in terms of electrons. Give an example.
(v) Give any two uses of sodium.
(vi) Define redox reaction.
(vii) What is meant by electropositive character? Give one example.
(viii) Write the chemical equation for the reaction between methane and chlorine.
PART-II
Note: Attempt any TWO (2) questions.
Q.5
(a) How was the neutron discovered? Write its properties. (5 Marks)
(b) Write four differences between a compound and a mixture. (4 Marks)
Q.6
(a) Write down five properties of metals. (5 Marks)
(b) Define evaporation and list the factors it depends on. (4 Marks)
Q.7
(a) Define corrosion and rusting. Describe any three methods for the prevention of corrosion. (5 Marks)
(b) Write down four characteristics of colloids. (4 Marks)