9th Class Chemistry Past Paper 2016
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 organic chemistry.
(ii) What is a mole?
(iii) What do you mean by carbon dating?
(iv) Write the isotopes of chlorine.
(v) Define Avogadro’s Number.
(vi) What is the difference between Mendeleev’s Periodic Law and Modern Periodic Law?
(vii) Define electron affinity.
(viii) What is the trend of atomic radius in a period and a group?
Q.2 Write short answers to any FIVE (5) questions: (10 Marks)
(i) Write two properties of covalent compounds.
(ii) Ionic compounds are solid. Explain.
(iii) Define a non-polar covalent bond and give one example.
(iv) Define hydrogen bonding and give one example.
(v) Does the density of gases increase on cooling? Explain.
(vi) Define standard atmospheric pressure.
(vii) Define diffusion and give one example.
(viii) What is meant by the freezing point?
Q.2 Write short answers to any FIVE (5) questions: (10 Marks)
(i) Write two differences between colloid and suspension.
(ii) What do you mean by % mass/mass?
(iii) Identify a strong and weak electrolyte among the following compounds:
- CuSOâ‚„
- Ca(OH)â‚‚
- HCl
- HNO₃
(iv) Write two differences between electrolytic and galvanic cells.
(v) Define corrosion.
(vi) Write at least two physical properties of magnesium.
(vii) Complete and balance the given chemical equation: Na + H₂ → ?
(viii) Write down the names of four least reactive metals.
PART-II
Note: Attempt any TWO (2) questions.
Q.5
(a) Define the following: (5 Marks)
(i) Physical chemistry
(ii) Biochemistry
(iii) Element
(iv) Radical
(v) Atomic number
(b) Write four properties of Cathode Rays. (4 Marks)
Q.6
(a) How is a coordinate covalent bond formed? Explain with examples. (4 Marks)
(b) Define evaporation. How is it affected by different factors? (5 Marks)
Q.7
(a) Define dilute solution and concentrated solution. How is a dilute solution prepared from a concentrated solution? (5 Marks)
(b) Discuss the electrolysis of water and write down the chemical reactions. (4 Marks)