9th Atoms and Molecules Question bank By KV For CBSE Board

CHAPTER - 3 “Atoms and Molecules”

1. Laws of Chemical Combination

2. John Dalton's Atomic Theory

3. Atoms, ions & Chemical Formula

4. Mole Concept

5. Molar Mass & Avogadro constant

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1 Mark Questions:

1. Who gave law of conservation of mass ?

2. What term is used to represent the mass of 1 mole molecules of a substance?

3. What name is given to the number 6.023 x 1023 ?

4. What is molecular mass?

5. Give Latin names for sodium & mercury.

6. *How many atoms are there in exactly 12 g of carbon ?

7. Define mole.

8. Calculate formula unit mass of CaCl2. [ At. Mass : Ca = 40 u , Cl = 35.5 u ]

9. Name a diatomic gas.

10. How many atoms are present in H2SO4.

2 Marks Questions:

1. Give the chemical symbols for the following elements: Gold, Copper , Potassium & Iron.

2. What do the following symbols represent - i) 1 H & i) H2

3. Neon gas consists if single atoms , what mass of neon contain 6.022 x 1023 atoms.

4. What elements do the following compounds contain ?   i) Water ii) Lead nitrate

5. State the differences between an atom or a molecule.

6. Molar Mass of water is 18 g mol-1 , what is the mass of 1 mole of water? .

7. The number of atoms in 1 mole of hydrogen is twice the number of atoms in one mole of helium. Why?

8. Write the chemical formulas for the following:

i) Silver oxide ii) Iron (III) sulphate

9. Calculate molar mass of H2O2 & HNO3.

10. What is the mass of 0.2 moles of oxygen molecules?

3 Marks Questions:

1. State the main postulates of John Dalton’s atomic theory.

2. What are polyatomic ions ? Give two examples.

3. State the following

i) Law of conservation of mass. ii) Law of constant proportion

4. What is the mass of :

i) 1 mol of N atoms. ii) 4 mol of Al atoms.

5. What is meant by the term atomicity ? State the atomicity of

i) Phosphorous  ii) Sulphur

5 Marks Questions:

1. i) What is molecular formula ? State with example what information can be derived from a molecular formula .

ii) Write the names of the compounds represented by the following formulas:

a) Mg(NO3)2 b) K2SO4 c )Ca3N2

2. i) What is gram molecular mass?

ii) Write the formulas & names of the compounds formed between:

a) Ferrous and sulphide ions b) Aluminium and sulphate ions

c) Potassium and chlorate ions d) Barium and chloride ions

3. i) Calculate the number of moles for the following:

a) 52 g of He b) 17 g of H2O

ii) How many molecules are present in 34 g of ammonia ?

iii) Calculate the mass of 0.5 mole of sugar (C12H22O11).

Other Download study links:  Chap 3 Atoms and Molecules class9

Class 9 Atoms and molecules NCERT Solutions-1
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Solved Problems (based on mole concept)
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Chapter based Multiple Choice Questions
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