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CBSE Class-9 Chemistry (Demo)

By Swathi T / 23/02/2025

CBSE CLASS 9 (PCMB) (Demo) CBSE Class-9 Chemistry (Demo)

Marking Scheme: +1 for correct answers, 0 for incorrect answers, 0 for unattempted questions. Option deselection is not available.

-Prepared by C Mohan, MSc, BEd.

Time limit: 0

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Question 1 of 25

1. Question
1 point(s)
Which of the following is NOT a subatomic particle?
- Neutron
- Proton
- Electron
- ion
Correct

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Question 2 of 25

2. Question
1 point(s)
What is the smallest particle of an element that retains its properties?
- Atom
- Molecule
- Ion
- Neutron
Correct

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Question 3 of 25

3. Question
1 point(s)
Who proposed the plum pudding model of an atom?
- J.J. Thomson
- Ernest Rutherford
- Niels Bohr
- James Chadwick
Correct

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Question 4 of 25

4. Question
1 point(s)
The atomic number of an element is determined by the number of:
- Protons
- Electrons
- Neutrons
- Nucleons
Correct

Incorrect
Question 5 of 25

5. Question
1 point(s)
Which of the following is NOT a compound?
- Water ( H 2 O )
- Oxygen (O2)
- Carbon dioxide (CO2)
- Hydrochloric acid ( HCl )
Correct

Incorrect
Question 6 of 25

6. Question
1 point(s)
The mass number of atom is equal to total number of:
- Protons and neutrons
- Protons and electrons
- Neutrons and electrons
- Electrons only
Correct

Incorrect
Question 7 of 25

7. Question
1 point(s)
Who proposed the planetary model of an atom?
- J.J. Thomson
- Ernest Rutherford
- Niels Bohr
- James Chadwick
Correct

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Question 8 of 25

8. Question
1 point(s)
Which of the following is NOT a chemical reaction?
- Rusting of iron
- Burning of magnesium
- Dissolving sugar in water
- Melting of ice
Correct

Incorrect
Question 9 of 25

9. Question
1 point(s)
Which scientist’s experiment led to the discovery of the nucleus of an atom?
- J.J. Thomson
- Ernest Rutherford
- Niels Bohr
- Niels Bohr
Correct

Incorrect
Question 10 of 25

10. Question
1 point(s)
Which of the following statements best describes an atom?
- Atoms are the smallest particles of matter that can exist independently.
- Atoms are composed of protons and electrons only.
- Atoms cannot be broken down further by chemical means.
- Atoms of different elements have the same mass number.
Correct

Incorrect
Question 11 of 25

11. Question
1 point(s)
What is the significance of the atomic number of an element?
- It represents the number of protons in the nucleus of an atom.
- It indicates the number of electrons in the outermost shell of an atom.
- It determines the mass of the atom.
- It reflects the number of neutrons in the nucleus.
Correct

Incorrect
Question 12 of 25

12. Question
1 point(s)
Which model of the atom states that electrons are distributed in various energy levels or shells?
- Rutherford's model
- Bohr's model
- Dalton's model
- Thomson's model
Correct

Incorrect
Question 13 of 25

13. Question
1 point(s)
What is the term used to describe atoms of the same element having different numbers of neutrons?
- Isotopes
- ion
- Molecules
- Compounds
Correct

Incorrect
Question 14 of 25

14. Question
1 point(s)
Which subatomic particle has negligible mass?
- Proton
- Electron
- Neutron
- Nucleus
Correct

Incorrect
Question 15 of 25

15. Question
1 point(s)
The mass of an atom is mainly attributed to the combined masses of its components.
- Protons and neutrons
- Protons and electrons
- Neutrons and electrons
- Protons, neutrons, and electrons
Correct

Incorrect
Question 16 of 25

16. Question
1 point(s)
What is the charge of an alpha particle?
- Positive
- Negative
- Neutral
- Variable
Correct

Incorrect
Question 17 of 25

17. Question
1 point(s)
Which of the following represents a molecular formula?
- H
- O 2
- NaCl
- Fe
Correct

Incorrect
Question 18 of 25

18. Question
1 point(s)
Which of the following particles has the least mass?
- Proton
- Nuetron
- Electron
- Positron
Correct

Incorrect
Question 19 of 25

19. Question
1 point(s)
The number of molecules present in one mole of any substance is
- $$6.022 \times 10^{23}$$
- $$6.002 \times 10^{23}$$
- $$6.022 \times 10^{22}$$
- $$6.002 \times 10^{22}$$
Correct

Incorrect
Question 20 of 25

20. Question
1 point(s)
What is the mass of one atom of carbon-12 in grams?
- 12 g
- 1g
- $$1 / 12 \mathrm{~g}$$
- 6 g
Correct

Incorrect
Question 21 of 25

21. Question
1 point(s)
The formula unit mass of a compound is:
- Molecular mass $$\times$$ Avogadro's number
- Molecular mass $$\times$$ Molar mass
- Molecular mass $$\times 1$$ /Avogadro's number
- Molar mass $$\times 1$$ /Avogadro's number
Correct

Incorrect
Question 22 of 25

22. Question
1 point(s)
The empirical formula of a compound is $$\mathrm{CH}_{2}$$ and its molecular mass is 56 . The molecular formula will be:
- $$\mathrm{C}_{2} \mathrm{H}_{4}$$
- $$\mathrm{C}_{4} \mathrm{H}_{8}$$
- $$\mathrm{C}_{3} \mathrm{H}_{6}$$
- $$\mathrm{C}_{5} \mathrm{H}_{10}$$
Correct

Incorrect
Question 23 of 25

23. Question
1 point(s)
Which of the following is NOT a diatomic molecule?
- Oxygen $$\left(\mathrm{O}_{2}\right)$$
- Nitrogen $$\left(\mathrm{N}_{2}\right)$$
- Hydrogen $$\left(\mathrm{H}_{2}\right)$$
- Carbon dioxide $$\left(\mathrm{CO}_{2}\right)$$
Correct

Incorrect
Question 24 of 25

24. Question
1 point(s)
The number of atoms present in $$\mathbf{1 1 . 5}$$ grams of sodium is approximately:
- $$6.022 \times 10^{23}$$
- $$3.011 \times 10^{23}$$
- $$1.806 \times 10^{24}$$
- $$3.706 \times 10^{24}$$
Correct

Incorrect
Question 25 of 25

25. Question
1 point(s)
Which of the following contains the maximum number of molecules?
- 19 CO2
- 1 g N2
- 1 g H2
- 1 g CH4
Correct

Incorrect

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