9th Class Chemistry Past Paper 2019
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) Define empirical formula with an example.
(ii) Give symbols of arsenic and silver.
(iii) Differentiate between cation and anion.
(iv) What do you mean by the plum pudding theory?
(v) Define isotopes and give an example.
(vi) Define Dobereiner’s triads.
(vii) What is meant by the shielding effect?
(viii) Why are noble gases not reactive?
Q.3 Write short answers to any FIVE (5) questions: (10 Marks)
(i) Define duplet rule and octet rule.
(ii) Write any two properties of ionic compounds.
(iii) What do you mean by malleability?
(iv) Define standard atmospheric pressure. Also write its unit.
(v) Convert 30°C to K unit.
(vi) Give two examples of suspension.
(vii) What do you mean by volume/mass %? Give an example.
Q.4 Write short answers to any FIVE (5) questions: (10 Marks)
(i) Why is oxygen necessary for rusting?
(ii) What solution is used as an electrolyte in Nelson’s cell?
(iii) Define redox reactions.
(iv) What is a salt bridge? What is its basic function?
(v) What is meant by malleable and ductile metals?
(vi) Write two uses of calcium.
(vii) Why is HF a weak acid?
(viii) Write down the chemical reaction of sodium with Hâ‚‚ and Clâ‚‚.
PART-II
Note: Attempt any TWO (2) questions.
Q.5
(a) Write down five results of Rutherford’s atomic model. (5 Marks)
(b) Define element and explain the kinds of elements with examples. (4 Marks)
Q.6
(a) Define coordinate covalent bond and explain it with an example. (5 Marks)
(b) Write down any four typical properties of gases. (4 Marks)
Q.7
(a) Explain the manufacture of sodium metal from fused NaCl. (5 Marks)
(b) Write any four characteristics of colloid. (4 Marks)