9th Class Chemistry Guess Paper on Chemistry 2020

Important Short Questions

What was the concept of Empedocles and Aristotle regarding matter.

Differentiate between Empirical Formula and Molecular Formula.

Define Free Radical and Formula Unit.

Write the Formation of NA+ ion.

Explain Auf Bau Principal.

Write down the electronic configuration of Potassium 19K39.

Explain Rutherford Experiment and discovery of nucleus. Also write its defects.

Write down the uses of Iodine-131, Iodine-123, Cobalt-60, Carbon-14 and Sulphur-35.

What is the difference and similarity between 17Cl35 and 17Cl37.

Write down the postulates of Bohr’s atomic theory.

Why “Na” has higher ionization energy than “K”?

Write down the valance shell electronic configuration of Alkali Metals, Alkaline Earth Metals, Halogens and Nobel Gases.

Explain Normal and Transition elements with examples.

Write down the concept of Newland’s and Mendeleev.

Explain Periodicity of Properties.

What is Shielding Effect. Write down its trend in periodic table.

What is Ionization Energy. Write down its trend in periodic table.

What is Electron Affinity. Write down its trend in periodic table.

What is Electro-negativity. Write down its trend in periodic table.

State Octet and Duplet Rules.

How does Al form cations?

How does O form anions?

Draw the Electron Dot and Electron Cross structure of H2O.

Write down the types of covalent bond with examples.

Explain the formation of Sr+2 and Ba+2.

Write equations with dot and cross structures of i) K and Cl ii) Al and N

Is there a need for more adhesives? What is the importance of glues and adhesives?

Why do the atoms react together and how?

What is hydrogen bonding? Explain dipole dipole interactions.

Is evaporation a cooling process?

Differentiate between diffusion and effusion.

Define and explain Boyle’s Law and Charles Law.

When you put nail polish on your palm, you will feel a sensation of coldness. Why?

Write down the names of allotropic forms of sulphur.

Explain Redox reaction in photography.

What are uses of Down’s cell and Nelson’s cell?

Write process of electrolytic refining of copper.

Differentiate between Electrolytic cell and Galvanic cell.

Write down the importance of Mg.

What do you know about application of platinum.

What is Aqua Regia?

Why it is advised not to pick Sodium metal with fingers?

Can Iodine displaces Cl2 or Br2 from their salts?

Why non-metals are electro-negative in nature?

Write about the Strontium-90.

What do you know about Inertness of Nobel Gases?

Rolled Gold?

What do you know about halogens?

What are hallides?

Explain Saturated, unsaturated and super saturated solutions.

What do you know about Ozone?

Define Alloys.

Define Molarity.

Write the usage of Potassium dichromate (K2Cr2O7)

What is Colloid and Suspension

Element and types


Homo and Hetero mixing

A n Z

Emp form

Exercise 1.3


Free Rad

Mol ion

Exercise # 1,2,3,5,12,18,10

Elec conf

Isotopes of U, Cl

Carbon dating

 Iso in poer equation

Exercise # 2,4,9,11


Periodic law

Preiodic period at radius



Shioeld ing effect



Trend at radius

Trans element

Define electro negativity?

Define electroplating. ?


Define empirical formula with example. ?

Define freezing point. ?

physical chemistry and biochemistry?

Define reducing agent. ?

pressure and write its unit?

Define relative atomic mass. ?

Give the applications of silver.

scope of Bio Chemistry.

Give the difference between electrolytic cell electrochemical cells.

How can you define atomic radius?

Give two postulates of Bohr’s atomic theory.

Define solubility?

supersaturated solution?

Define standard atmosphere pressure?

Define the empirical formula an example?

Explain the relationship between mass and mole of substance?

Define the term allotropy with examples?

Explain the term absolute zero?

How can you justify the milk is colloid?

How oxygen reacts with group II A metals?

sodium forma chemical bound with chloride?

Why ionic compounds are easily soluble in water?

Why have water polar covalent bonds?

Write down the names of elements of group 1 with their symbols?

Why magnesium is harder than sodium?

Important long Questions

  1. Briefly describe the electrolysis of water.
  2. Briefly describe the electrolytic refining of copper.
  3. Define hydrogen bonding. Explain how these properties affect the physical properties of compound.
  4. Describe different types of molecules.
  5. Describ different ways of expressing the percentage composition of a solution.
  6. Describe Nelson’s Cell for the manufacture of Caustic soda from brine solution.Differentiate between dilute
  7. solution and concentrated solutions with a common example.
  8. Discuss the construction and working of a cell in which electricity is produced.
  9. Discus the important features of modern periodic table.
  10. Discuss the working of Daniel cell.
  11. What is a coordinate covalent bond? Explain it with example.
  12. What is an isotope? Describe the isotope of hydrogen with diagram.Write a short note on Allotropy.
  13. Write down the important chemical reactions of halogens.

Chapter-wise MCQs, Short Questions and Long Questions Scheme of Studies

S. NoChapter NameWeightage
Marks DistributionMCQ(s)Short Answer Question(s)Long Question Answer(s)
1Fundamentals of Chemistry2012131
2Structure of Atoms159121
3Periodic Table and Periodicity of Properties13823
4Structure of Molecules2213231
5Physical States of Matter159121
8Chemical Reactivity15914
Marks:MCQs                            12Short                              30Long                              18Total                              60

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