MCQ Questions for Class 9 Science Chapter 4 Structure of the Atom with Answers
Q1. Which of the following has largest number of particles?
8g of `CH_{4}`
4.4g of `CO_{2}`
34.2g of `C_{12}H_{22}C_{11}`
2g of `H_{2}`
8g of `CH_{4}`
4.4g of `CO_{2}`
34.2g of `C_{12}H_{22}C_{11}`
2g of `H_{2}`
Q2. The number of molecules in 16.0g of oxygen is:
6.02 `\times 10^{23}`
6.02 `\times 10^{-23}`
3.01 `\times 10^{-23}`
3.01 `\times 10^{23}`
6.02 `\times 10^{23}`
6.02 `\times 10^{-23}`
3.01 `\times 10^{-23}`
3.01 `\times 10^{23}`
Q3. The percentage of hydrogen in `\H_{2}`O is
8.88
11.12
20.60
80.0
8.88
11.12
20.60
80.0
Q4. Find the mass of oxygen contained in 1 kg of potassium nitrate `\KNO_{3}`
475.5g
485.5g
475.2g
485.2g
475.5g
485.5g
475.2g
485.2g
Q5. How many moles of electron weight one kilogram?
6.023 `\times 10^{23}`
6.023 `\times 10^{8}`
9.108 `\times 10^{54}`
6.023 `\times 10^{23}`
6.023 `\times 10^{8}`
9.108 `\times 10^{54}`
1.82 `\times 10^{8}`
Q6. 25.4g of iodine and 14.2g of chlorine are made to react completely to yield a mixture of `\ICl` and `\ICl_{3}`. Calculate the ratio of moles of `\ICl` and `\ICl_{3}`
1:1
2:1
3:1
1:2
2:1
3:1
1:2
Q7. The mass of sodium in 11.7 g of sodium chloride is:
2.3g
4.6g
6.9g
7.1g
2.3g
4.6g
6.9g
7.1g
Q8. The formula of a chloride of a metal M is `\MCl_{3}`. The formula of the phosphate of metal M will be:
`\MPO_{4}`
`\M_{2}PO_{4}`
`\M_{3}PO_{4}`
`\M_{2}(PO_{4})_{3}`
`\MPO_{4}`
`\M_{2}PO_{4}`
`\M_{3}PO_{4}`
`\M_{2}(PO_{4})_{3}`
Q9. Which of the following contains the largest number of molecules?
0.2 mol 0f `\H_{2}`
8.0 g of `\H_{2}`
17 g of `\H_{2}O`
6.0 g of `\CO_{2}`
0.2 mol 0f `\H_{2}`
8.0 g of `\H_{2}`
17 g of `\H_{2}O`
6.0 g of `\CO_{2}`
Q10. One gram of which of the following contains largest number of oxygen atoms?
`\O`
`\O_{2}`
`\O_{3}`
All contain same
`\O`
`\O_{2}`
`\O_{3}`
All contain same
Q11. The percentage by weight of `\O_{2}` in `\CaSO_{4}` (O = 16, S = 32, Ca = 40) is:
64
28.2
47.2
16.2
64
28.2
47.2
16.2
Q12. The percentage by weight of Zn in white vitriol, `\ZnSO_{4}.7H_{2}O` (Zn = 65, S = 32. O = 16, H = 1) is approximately:
23
33
43
13
23
33
43
13
Q13. The formation of `\SO_{2}` and `\SO_{3}` explain:
The law of conservation of mass
The law of multiple proportions
The law of definite properties
Boyle's law
The law of conservation of mass
The law of multiple proportions
The law of definite properties
Boyle's law
Q14. The law of definite proportions was given by:
John Dalton
Humphry davy
Proust
Michael Faraday
John Dalton
Humphry davy
Proust
Michael Faraday
Q15. Molecular mass is defined as the:
Mass of one atom compared with the mass of one molecule
Mass f one atom compared with the mass of one atom of hydrogen
Mass of one molecule of any substance compared with the mass of one atom of C – 12
None of the above
Mass of one atom compared with the mass of one molecule
Mass f one atom compared with the mass of one atom of hydrogen
Mass of one molecule of any substance compared with the mass of one atom of C – 12
None of the above
Q16. 0.001 g of C is required t write a letter with a graphite pencil. The total number of C atoms used in writing the letter is:
5.00 `\times 10^{12}`
5 `\times 10^{19}`
5.0 `\times 10^{24}`
6.023 `\times 10^{23}`
5.00 `\times 10^{12}`
5 `\times 10^{19}`
5.0 `\times 10^{24}`
6.023 `\times 10^{23}`
Q17. One mole of a gas occupies a volume of 22.4 L. This is derived from:
Berzelius’s hypothesis
Gay- Lussac’s law
Avogadro’s law
Dalton’s law
Berzelius’s hypothesis
Gay- Lussac’s law
Avogadro’s law
Dalton’s law
Q18. The mass of one C atom is:
6.023 `\times 10^{23}`
1.99 `\times 10^{-23}`
2.00 g
12 g
6.023 `\times 10^{23}`
1.99 `\times 10^{-23}`
2.00 g
12 g
Q19. The chemical symbol for barium is:
B
Ba
Be
Bi
B
Ba
Be
Bi
Q20. The chemical symbol P stands for:
Phosphorus
Potassium
Polonium
Promethium
Phosphorus
Potassium
Polonium
Promethium
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Class 9 Science