9th Class Chemistry Important Short Questions

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Important Short Questions (Chapter-Wise)

Chapter 1:

1. Define physical properties with two examples.
2. Define compound give example.
3. Define empirical formula with an example.
4. Define elements.
5. Define mixture with example.
6. Define relative atomic mass and its unit.
7. Differentiate between molecular mass and formula mass.
8. How does homogeneous mixture differ from heterogenous mixture?
9. What is difference between atomic no and mass no?
10. Define Avogadro’s Number.
11. Which one has more molecules. 9 g of water or 9 g of sugar.
12. Differentiate between homoatomic and heteroatomic molecules.

Chapter 2:

1. Differentiate between shell and sub shell with example.
2. Defects of Rutherford model.
3. Define Electronic Configuration.
4. An element has an Atomic no 17 how many electron are present in K, L, M shell of the atom.
5. Any two postulate of Bohra’s Atomic theory.
6. What is meant by quantum and quanta?
7. Write down the electronic configuration of Al3+. How many electron are present in its valance shell?
8. Give Two observation of Rutherford Experiment.
9. Electronic Configuration of P, Cl1- Na1+ Mg2+

Chapter 3:

1. Why shielding effect of electrons makes cation formation easy?
2. Why and how are element arranged in 4th periods.
3. Define atomic radius.
4. Trend of Ionization in group and period.
5. Define Electron affinity.
6. Give the trend of ionization in period.
7. Why are Nobel gases not reactive?
8. Why the elements are called s and p block elements.
9. What do you mean periodic functions.
10. Differentiate between modern and Mendeleev Periodic law?
11. Define group and period in a periodic table.
12. What are transition metals.
13. Give the reason for the increase electron affinity in period.
14. Define electronegativity.

Chapter 4:

1. What type of covalent bond is formed in N molecule.
2. Difference Between polar and non-polar covalent bond.
3. What is coordinate covalent bond.
4. Difference between Lone pair and bond pair of electron.
5. Define ionic and covalent.
6. Why HCl has dipole-dipole forces of attraction.
7. Covalent in H2 is nonpolar. Why?
8. What is dative covalent bond.
9. Types of Covalent Bond are all very important.
10. Relation between electronegativity and polarity.
11. Metals are good conductor of electricity why?
12. Difference between inter and intra molecular forces.
13. Why is the bond between an electropositive and electronegative atoms is ionic in nature?

Chapter 5:

1. What do you mean by evaporation and how it is affected by surface area?
2. What are affect of temperature on evaporation/
3. What is the affect of external pressure on boiling point.
4. Define Boyle’s and Charles’s Law.
5. Define vapor pressure.
6. Difference Between evaporation and boiling point?
7. Define Absolute Zero
8. Define Melting, freezing and boiling point.
9. Define condensation.

Chapter 6:

1. Difference between solution and mixture.
2. Diff between solvent and solute.
3. Define Molarity and its unit and formula.
4. Define Molar solution
5. Define solution with Example
6. Define aqueous, dilute, concentrated, saturated, unsaturated solutions.
7. Define solubility.
8. Explain Like dissolve Like.
9. How molar of NaOH is prepared.

Chapter 7:

1. Define Oxidation and reduction. (In all term)
2. Define Redox reaction with example
3. Differentiate between valency and oxidation no
4. Define Oxidizing and Define reducing agent
5. Define electrolyte, strong, weak and non.
6. Define electrolysis.
7. Define spontaneous and nonspontaneous reactions.
8. What is electro chemical cell and its types.
9. Define Corrasion and its perversion.
10. Why is galvanizing done?
11. Why is O2 is necessary for rusting?
12. Define electroplating.
13. Define Alloy.

Chapter 8:

1. Why reactivity of metal increase down the group.
2. What do you mean electro positivity or metallic character.
3. Why are Physical properties of metal.
4. Why the 2nd of Mg is greater than the 1st one?
5. Why is Cu used for making electrical wires?
6. Name of moderate reactive metals.
7. Why are Four uses of Platinum.
8. Why are Application of silver.
9. Why are Uses of Gold
10. Name of any four reactive metals.
11. Why are Physical properties of nonmetal.
12. Why HF is weak acid than HCl.

This article is posted for helping students to enhance their grades in their exams as well as learning skills in the field of chemistry. 

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