9th Class Chemistry Past Paper 2017 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) How does a homogeneous mixture differ from a heterogeneous mixture?
(ii) Calculate the molecular mass of nitric acid (HNO₃).
(iii) State the Plum Pudding Theory.
(iv) Write two properties of neutron particles.
(v) How is goitre in the thyroid gland detected?
(vi) What are triads? Give an example.
(vii) What is meant by periodic functions?
(viii) Define atomic radius. Give its units.
Q.3 Write short answers to any FIVE (5) questions: (10 Marks)
(i) Why are metals good conductors of electricity?
(ii) What do you mean by hydrogen bonding?
(iii) Define metallic bond.
(iv) Differentiate between diffusion and effusion.
(v) What do you know about the mobility of gases?
(vi) Why do raindrops fall downward?
(vii) Why does ice float on water?
Q.4 Write short answers to any FIVE (5) questions: (10 Marks)
(i) What do you mean by volume/volume %?
(ii) What is molarity? Give its formula.
(iii) What is the function of a salt bridge?
(iv) Define oxidation in terms of electrons. Give an example.
(v) Which force drives a non-spontaneous reaction to take place?
(vi) Why is copper used for making electrical wires?
(vii) What do you mean by 24-carat gold?
(viii) Give the applications of silver.
PART-II
Note: Attempt any TWO (2) questions.
Q.5
(a) Differentiate between a compound and a mixture. (5 Marks)
(b) What is an isotope? Describe the isotopes of hydrogen with a diagram. (4 Marks)
Q.6
(a) Define a covalent bond. Explain its types with one example each. (4 Marks)
(b) State Charles’s Law and write down its experimental verification. (5 Marks)
Q.7
(a) Write down any five properties of colloids. (4 Marks)
(b) Describe in detail the electrolysis of fused NaCl in the Downs cell. (5 Marks)