10 - Science - 10. Chemistry – Atoms And Molecules
6 Questions
| Attempts: 1755
Questions and Answers
- 1.From the given examples, form the pair of isotopes. 18 Ar 40, 17 Cl 35, 20 Ca 40, 17 Cl 37
- A.
18 Ar 40, 20 Ca 40
- B.
17 Cl 35, 17 Cl 37
- 2.From the given examples, form the pair of isobars. 18 Ar 40, 17 Cl 35, 20 Ca 40, 17 Cl 37
- A.
17 Cl 35, 17 Cl 37
- B.
18 Ar 40, 20 Ca 40
- 3.Molecular mass of nitrogen is 28. Its atomic mass is 14. Find the atomicity of nitrogen.
- A.
28
- B.
14
- C.
2
- D.
3
- 4.Gram molecular mass of oxygen is 32g. Density of oxygen is 1.429g/cc. Find the gram molecular volume of oxygen.
- A.
1.429g/cc
- B.
32g
- C.
1 lit
- D.
22.4 lit
- 5.Calculate the gram molecular mass of water from the values of gram atomic mass of hydrogen and of oxygen.
- A.
1
- B.
16
- C.
18
- D.
19
- 6.One mole of any substance contains 6.023 x 1023 particles. If 3.0115 x 1023 particles are present in CO2. Find the number of moles.
- A.
1
- B.
2
- C.
.05
- D.
0.25
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