Atoms and Molecules MCQ Questions for Class 9 Science Chapter 3 with Answers

We have completed the NCERT/CBSE chapter-wise Multiple Choice Questions for Class 9 Science book Chapter 3 Atoms and Molecules with Answers by expert subject teacher for latest syllabus and examination. You can Prepare effectively for the exam taking the help of the Class 9 Science Objective Questions PDF free of cost from here. Students can take a free test of the Multiple Choice Questions of Atoms and Molecules. Each Questions has four options followed by the right answer. Download the Science Quiz Questions with Answers for Class 9 free Pdf and prepare to exam and help students understand the concept very well.

MCQ Questions for Class 9 Science with Answers: Chemistry

Q1. The radius of a hydrogen atom is:

(i) 10-2
(ii) 10-4
(iii) 10-9
(iv) 10-10

(iv)

Q2. Which of the following is correct pair of elements and its symbol?

(i) Silver – Si
(ii) Sodium – So
(iii) Potassium – Pt
(iv) Sulphur – S

(iv) Sulphur – S

Q3. The chemical symbol for sodium is

(i) So
(ii) Sd
(iii) NA
(iv) Na

(iv) Na

Q4. 1 u or 1 amu means

(i) 1/12th mass of C-12 atoms
(ii) Mass of C-12 atom
(iii) Mass of O-16 atom
(iv) Mass of Hydrogen molecule

(i) 1/12th mass of C-12 atoms

Q5. The atomic mass of carbon is:

(i) 12
(ii) 14
(iii) 16
(iv) 23

(i) 12

Q6. How many moles are present in 40 g of He?

(i) 10 moles
(ii) 11 moles
(iii) 13 moles
(iv) 12 moles

(i) 10 moles

Q7. Which of the following has maximum number of atoms?

(i) 18 g of H2O
(ii) 18 g of O2
(iii) 18 g of CO2
(iv) 18 g of CO4

(iv)

Q8. A sample of NH3 molecule irrespective of source contains 82.35% Nitrogen and 17.65% of Hydrogen by mass. This data supports:

(i) Law of Conservation of Mass
(ii) Las of Multiple Proportions
(iii) Law of Definite Proportions
(iv) Avogadro’s Law

(iii) Law of Definite Proportions

Q9. The word “mole” was introduced around 1896 by:

(i) Wilhelm Ostwald
(ii) John Dalton
(iii) Avogadro
(iv) Vergilious

(i) Wilhem Ostwald

Q10. Which of the following is the major drawback of Dalton’s atomic theory?

(i) Atoms of an element have exactly the same mass.
(ii) Atoms are indivisible.
(iii) Atoms of different elements have different masses.
(iv) All of the above

(ii) Atoms are indivisible.

Q11. A change in the physical state can be brought about

(i) only when energy is given to the system
(ii) only when energy is taken out from the system
(iii) when energy is either given to, or taken out from the system
(iv) without any energy change

(iii) when energy is either given to, or taken out from the system

Q12. 3.42 g of sucrose are dissolved in 18 g of water in a beaker. The numbers of oxygen atoms in the solution are:

(i) 6.68 ×1023
(ii) 6.09 ×1022
(iii) 6.022 ×1023
(iv) 6.022 ×1021

(i)

Q13. Which of the following has a maximum number of atoms?

(i) 18 g of H2O
(ii) 18 g of O2
(iii) 18 g of CO2
(iv) 18 g of CH4

(iv)

Q14. 9 grams of water decompose to give:

(i) 4g oxygen and 16g hydrogen
(ii) 2g hydrogen and 1g oxygen
(iii) 8g oxygen and 1g hydrogen
(iv) none

(iii) 8g oxygen and 1g hydrogen

Q15. The relative molecular mass of Na2S2O3.5H2O is

(i) 250 amu
(ii) 250 g
(iii) 248 amu
(iv) 248 g

(iii) 248 amu

Q16. The atomic mass of sodium is 23. The number of moles in 46g of sodium is

(i) 4
(ii) 2
(iii) 0
(iv) ½

(ii) 2

Q17. Who coined the term ‘Parmanu’ for the smallest indivisible particles?

(i) Leucippus
(ii) L. Lavoisier
(iii) Kanad
(iv) None of them

(iii) Kanad

Q18. What is the mass of 0.5 mole of Hydrogen atom

(i) 2.0 g
(ii) 1.5 g
(iii) 1 g
(iv) 0.5 g

(iv) 0.5 g

Q19. Percentage of calcium in calcium carbonate is

(i) 40
(ii) 30
(iii) 48
(iv) 36

(i) 40

Q20. What is the formula mass unit of ZnO?

(i) 18 u
(ii) 81 u
(iii) 88 u
(iv) 188 u

(ii) 81 u

Q21. Calculate the formula unit mass of ZnCl2?

(i) 137 u
(ii) 124 u
(iii) 123 u
(iv) 111 u

(i) 137 u

Q22. How many times an atom of sulphur is heavier than an atom of carbon?

(i) 32 times
(ii) 12 times
(iii) 8/3 times
(iv) 12/32 times

(iii) 8/3 times

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