Chemistry Important Questions for 9th Class – Punjab Board, Pakistan

By: Prof. Dr. Fazal Rehman | Last updated: March 10, 2024

Chemistry Class 9^th  – Objective (2019) (1) The empirical formula of Glucose is: (A) H₂O (B) CH₂O (C) CH (D) C₆H₁₂O₆ (2) Which one of the following shells consists of three sub-shells? (A) O shell (B) N shell (C) L shell (D) M shell   (3) Second group elements of periodic table are called: (A) Alkali metals (B) Alkaline earth metals (C) Noble gases (D) Carbon family   (4) Number of elements in sixth period of Periodic Table are: (A) 8 (B) 18 (C) 32 (D) 23   (5) A good example of ionic compound is: (A) H₂S0₄ (B) CH₂ (C) CO₂ (D) NaCl   (6) Transfer of electrons between atoms results in: (A) lonic Bonding (B) Metallic Bonding (C) Covalent Bonding (D) Coordinate Covalent Bonding   (7) How many times are the liquids denser than gases? (A) 100 (B) 1000 (C) 10000 (D) 100000   (8) Which one of the following is not a colloid? (A) Starch (B) Soap solution (C) Blood (D) Milk of Magnesia   (9) Mist is an example of a solution: .   (A) Liquid in gas (B) Gas in liquid (C) Solid in gas (D) Gas in solid   (10) Oxidation number of “N” in HNO3 is: (A) +2 (B) +3 (C) +4 (D) +5   (11) Which one of the following is a non-electrolyte? (A) Sugar solution (B) Sulphuric Acid solution (C) Lime solution (D) Sodium Chloride solution   (12) Which metal burn with brick red flame in air? (A) Calcium (B) Sodium (C) Barium (D) Potassium Subjective (2019) Short Questions

1. Write any two applications of Nuclear Chemistry.
2. Define Atomic number and Molecular mass.
3. Differentiate between homoatomic molecule and heteroatomic molecule.
4. What is “Plum pudding” theory?
5. White down the electronic configuration(subshelll) of Al .
6. Give the trends of shielding effect in a period and in a group.
7. Write down the names of elements of first Period with their symbols
8. Write down the atomic radii (pm) of Li and Be.
9. Define Duplet rule.
10. Define Covalent bond and give an example.
11. What is Dative Covalent Bond? Show it with one example.
12. in which form Sulphur exists at 100°C ?
13. Why are the densities of gases lower than that of liquids?
14. What do you mean by “Like dissolves Like”? Explain with examples.
15. Why does the suspension not form a homogeneous mixture?
16. Define Tyndall effect.
17. Define Reduction with an example.
18. What ls Oxidation number? Give an example.
19. \Write down the names of two types of Electrochemical cells.
20. Define non-electrolytes and give an example.
21. Write down the names of two soft metals.
22. Write down any two physical properties of Calcium.
23. What are any two uses of Magnesium?
24. Complete and balance the following chemical equations:

(i) Na+H₂—>                                      (ii) Na+Cl2 —> Long Questions

1. Write down the five properties of Canal rays.
2. Define lon. Write its two types with examples.
3. Define lonic Bond. Explain it with one example.
4. What Is Boyle’s Law? Explain it with experimental verification.
5. Define Redox reaction; also give comparison of electrolytic call and galvanic call.
6. Define Solubility. Write down three different possibilities under the general principle of solubility.

 

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