9th Class Chemistry Past Paper 2018
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 nuclear chemistry.
(ii) Differentiate between physical properties and chemical properties.
(iii) Define symbols of elements.
(iv) Explain the treatment of cancer by radiotherapy.
(v) Explain the use of U-235 in power generation.
(vi) Define atomic radius and give an example.
(vii) Why does ionization energy increase from left to right in a period?
(viii) Write down the names of elements found in the second period.
Q.3 Write short answers to any FIVE (5) questions: (10 Marks)
(i) Why do atoms react?
(ii) Why does ice float on water?
(iii) Ionic compounds are solids. Justify.
(iv) In which form does sulfur exist at 100°C?
(v) What is diffusion in gases? Give an example.
(vi) Why do we stir paints thoroughly before using?
(vii) What do you mean by % Volume/Volume?
(viii) How will you test whether a given solution is a colloidal solution or not?
Q.4 Write short answers to any FIVE (5) questions: (10 Marks)
(i) What are redox reactions?
(ii) What is meant by a reducing agent?
(iii) Define oxidation.
(iv) Calculate the oxidation number of “N” in AgNO₃ and HNO₃.
(v) Write two applications of gold.
(vi) Give the occurrence of alkali metals and alkaline earth metals.
(vii) Write any two chemical properties of non-metals.
(viii) What is the trend of electropositive character of metals in groups and periods?
PART-II
Note: Attempt any TWO (2) questions.
Q.5
(a) Write five properties of cathode rays. (5 Marks)
(b) Write four differences between a molecule and a molecular ion. (4 Marks)
Q.6
(a) Write the properties of covalent compounds. (4 Marks)
(b) What is allotropy? What are its reasons? Explain transition temperature also. (5 Marks)
Q.7
(a) Discuss the electrolysis of water. (4 Marks)
(b) Give the four characteristics of colloids. (5 Marks)