| 1 |
Which statement is incorrect about Dempster's mass spectrometer. |
- A. Solid sample can be used in this mass spectrometer
- B. Ions are detected on the basis of mass to charge ratio
- C. Atoms or molecules are ionized with beam of electron.
- D. This spectrometer work at one atmospheric pressure.
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| 2 |
One mole of CH<sub>3</sub>OH and one mole of C<sub>2</sub>H<sub>5</sub>OH have |
- A. Equal number of atoms
- B. Equal number of molecules
- C. Equal number of electrons
- D. Equal number of protons
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| 3 |
Bromine has isotopes |
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| 4 |
Which is not a molecular ion. |
- A. He+
- B. CH3+
- C. NH3-
- D. CO+
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| 5 |
Tin has Isotopes |
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| 6 |
What has a mass equal to that of one mole of water. |
- A. 22.4 dm3 of water
- B. One mole of steam
- C. One molecule of water
- D. Two moles of hydrogen molecules and one mole of oxygen molecules.
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| 7 |
The total number of protons and neutrons present in the nucleus of an atom is called. |
- A. Mass number
- B. Atomic number
- C. Molecular mass
- D. Relative atomic mass
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| 8 |
Cadmium has isotopes. |
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| 9 |
How many moles of CO are present having 12.04 x 10<sup>23</sup>molecules of CO2. |
- A. 0.5 mol
- B. 1.0 mol
- C. 1,5 mol
- D. 2.0 mol
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| 10 |
A limiting reactant is that one which |
- A. Gives greatest number of moles of products
- B. Gives least number of moles of products
- C. Is left behind after the completion of reaction
- D. Is mostly a cheaper substance as compared to other reactants
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