MCQ Atoms and Molecules | NCERT Class 9 Science

#1. A change in the physical state can be brought about

a) only when energy is given to the system

b) only when energy is taken out from the system

c) when energy is either given to or taken out from the system

d) without any energy change

#2. The atomic mass of Cl is

a) 35.5

b) 17

c) 51

d) None of these

#3. Mass of one atom of oxygen is

a) 16/(6.022x10²³) g

b) 32/(6.022x10²³) g

c) 1/(6.022x10²³) g

d) 8 u

#4. Which one of the following represents a correct chemical formula?

a) CaCl

b) BiPO₄

c) NaSO₄

d) NaS

#5. Given that- CH₄(16 g) + 2O₂(64 g) ⇒ CO₂(X g) + H₂O(36 g). Find the value of X.

a) 28 g

b) 32 g

c) 44 g

d) 40 g

#6. 3.42 g of sucrose (C₁₂H₂₂O₁₁) is dissolved in 18 gram of water in a beaker. The number of oxygen atoms in the solution

a) 6.022x10²¹

b) 6.022x10²³

c) 6.09x10²²

d) 6.68x10²³

#7. Which of the following has maximum no. of atoms

a) 18 g of H₂O

b) 18 g of O₂

c) 18 g of CO₂

d) 18 g of CH₄

#8. Which element is used as standard atomic mass scale

a) Sulphur 12

b) Carbon 15

c) Oxygen 16

d) Carbon 12

#9. Which statement is correct

a) an atom has equal nos. of proton, electron & neutron

b) an atom has equal nos. of proton & neutron

c) an atom has equal nos. of proton & electron

d)an atom has equal nos. of electron & neutron

#10. Which of the following contains maximum number of molecule

a) 1 g CO₂

b) 1 g N₂

c) 1 g CH₄

D) 1 g H₂

#11. The formula unit mass of calcium chloride is

a) 108

b) 109

c) 110

d) 111

#12. Which represents 360 g of water – a) 2 moles of H₂O, b) 20 moles of H₂O, c) 6.022×10²³ molecules of H₂O, d) 1.2044×10²⁵ molecules of H₂O?

a & d

b & c

b & d

#13. The chemical symbol of nitrogen gas

a) Ni

b) N₂

c) N⁺

d) N

#14. Which of the following would weigh highest

a) 0.2 moles of CaCO₃

b) 10 moles of H₂O

c) 0.2 moles of sucrose (C₁₂H₂₂O₁₁)

d) 2 moles of CO₂

#15. Which statement is not true?

a) Atoms are not able to exist independently

b) Atoms are the basic units from which molecules & ions are formed

c) Atoms are always neutral in nature

d) Atoms aggregate in large numbers to form the matter that we can see, feel or touch

#16. The chemical symbol for sodium is

a) NA

b) Na

c) So

d) Sd

#17. In an experiment to verify the law of conservation of mass in a chemical reaction, weighing of flask with its content is done carefully

a) only after the experiment

b) only before the experiment

c) both before & after the experiment

d) weighing is not required

Finish

Results

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MCQ & Online Test – Atoms and Molecules – NCERT Class 9 Science Chapter 3

Online Test | MCQ Atoms and Molecules | NCERT Class 9 Science Chapter 3 | CBSE Syllabus

#1. A change in the physical state can be brought about

#2. The atomic mass of Cl is

#3. Mass of one atom of oxygen is

#4. Which one of the following represents a correct chemical formula?

#5. Given that- CH₄(16 g) + 2O₂(64 g) ⇒ CO₂(X g) + H₂O(36 g). Find the value of X.

#6. 3.42 g of sucrose (C₁₂H₂₂O₁₁) is dissolved in 18 gram of water in a beaker. The number of oxygen atoms in the solution

#7. Which of the following has maximum no. of atoms

#8. Which element is used as standard atomic mass scale

#9. Which statement is correct

#10. Which of the following contains maximum number of molecule

#11. The formula unit mass of calcium chloride is

#12. Which represents 360 g of water – a) 2 moles of H₂O, b) 20 moles of H₂O, c) 6.022×10²³ molecules of H₂O, d) 1.2044×10²⁵ molecules of H₂O?

#13. The chemical symbol of nitrogen gas

#14. Which of the following would weigh highest

#15. Which statement is not true?

#16. The chemical symbol for sodium is

#17. In an experiment to verify the law of conservation of mass in a chemical reaction, weighing of flask with its content is done carefully

Results

Online Test | MCQ Atoms and Molecules | NCERT Class 9 Science Chapter 3 | CBSE Syllabus

#1. A change in the physical state can be brought about

#2. The atomic mass of Cl is

#3. Mass of one atom of oxygen is

#4. Which one of the following represents a correct chemical formula?

#5. Given that- CH4(16 g) + 2O2(64 g) ⇒ CO2(X g) + H2O(36 g). Find the value of X.

#6. 3.42 g of sucrose (C12H22O11) is dissolved in 18 gram of water in a beaker. The number of oxygen atoms in the solution

#7. Which of the following has maximum no. of atoms

#8. Which element is used as standard atomic mass scale

#9. Which statement is correct

#10. Which of the following contains maximum number of molecule

#11. The formula unit mass of calcium chloride is

#12. Which represents 360 g of water – a) 2 moles of H2O, b) 20 moles of H2O, c) 6.022×1023 molecules of H2O, d) 1.2044×1025 molecules of H2O?

#13. The chemical symbol of nitrogen gas

#14. Which of the following would weigh highest

#15. Which statement is not true?

#16. The chemical symbol for sodium is

#17. In an experiment to verify the law of conservation of mass in a chemical reaction, weighing of flask with its content is done carefully

Results

#5. Given that- CH₄(16 g) + 2O₂(64 g) ⇒ CO₂(X g) + H₂O(36 g). Find the value of X.

#6. 3.42 g of sucrose (C₁₂H₂₂O₁₁) is dissolved in 18 gram of water in a beaker. The number of oxygen atoms in the solution

#12. Which represents 360 g of water – a) 2 moles of H₂O, b) 20 moles of H₂O, c) 6.022×10²³ molecules of H₂O, d) 1.2044×10²⁵ molecules of H₂O?