9th Class Chemistry Past Paper 2023 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 industrial chemistry and analytical chemistry.
ii. Explain why hydrogen and oxygen are considered as elements whereas water as a compound?
iii. Write two properties of neutron.
iv. How many maximum electrons can be accommodated in K, L, M, N shells?
v. What is the trend of ionization energy in period and why?
vi. Define electronegativity. Which one halogen has the highest electronegativity value?
vii. Write names of elements of the first period.
viii. Write down the name of elements of group-I (any two).
Q.3 Write short answers to any FIVE (5) questions: (10 Marks)
i. Define duplet and octet rule.
ii. Why does ice float over water?
iii. Define metallic bond.
iv. What is meant by standard atmospheric pressure?
v. Define dynamite.
vi. What is diffusion? Explain with an example.
vii. How is a molar solution prepared?
viii. Why are colloids quite stable?
Q.4 Write short answers to any FIVE (5) questions: (10 Marks)
i. Define oxidation number.
ii. What is meant by electrolysis?
iii. What are weak electrolytes? Give at least one example.
iv. Define rusting. Write its important condition.
v. What do you mean by 22 carat gold?
vi. Write down the chemical reaction of Mg with O2 and N2.
vii. What is the trend of electropositivity in a group and a period?
viii. Write any two physical characteristics of metals.
PART-II
Note: Attempt any TWO (2) questions.
Q.5
(a) List five differences between compound and mixture.
(b) Describe four properties of canal rays.
Q.6
(a) Describe types of covalent bonds.
(b) Define evaporation. Explain factors affecting evaporation.
Q.7
(a) How can we prepare sodium hydroxide (NaOH) on a commercial scale? Discuss its chemistry along with a diagram.
(b) What is a saturated solution and how is it prepared?