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Q. No.Which of the following statement is not correct about the characteristics of cathode rays?
| 1. | They start from the cathode and move towards the anode |
| 2. | They travel in straight line in the absence of an external electrical or magnetic field |
| 3. | Characteristics of cathode rays do not depend upon the material of electrodes in cathode ray tube |
| 4. | Characteristics of cathode rays depend upon the nature of gas present in the cathode ray tube |
Subtopic: Introduction of Atomic Structure |
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Determine the mass of the atom for which the unipositive cation has a mass-to-charge ratio (m/e) of 1.5 × 10–8 kg/C :
1. 2.4 ×10–19 g
2. 2.4 ×10–27 g
3. 2.4 ×10–24 g
4. None of the above.
1. 2.4 ×10–19 g
2. 2.4 ×10–27 g
3. 2.4 ×10–24 g
4. None of the above.
Subtopic: Introduction of Atomic Structure |
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Which of the following statements about the electron is incorrect?
| 1. | It is a negatively charged particle. |
| 2. | The mass of electron is equal to the mass of neutron. |
| 3. | It is a basic constituent of all atoms. |
| 4. | It is a constituent of cathode rays. |
Subtopic: Number of Electron, Proton & Neutron |
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Correct statement about the properties of the atom explained by the Thomson
model of an atom is:
| 1. | Overall neutrality of atom |
| 2. | Spectra of a hydrogen atom |
| 3. | Position of electrons, protons, and neutrons in an atom |
| 4. | Stability of atom |
Subtopic: Introduction of Atomic Structure |
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Which of the following conclusions could not be derived from Rutherford's -particle scattering experiment?
| 1. | Most of the space in the atom is empty. |
| 2. | The radius of the atom is about 10-10 m while that of a nucleus is 10–15 m. |
| 3. | Electrons move in circular path of fixed energy called orbits. |
| 4. | Electrons and the nucleus are held together by electrostatic forces of attraction. |
Subtopic: Introduction of Atomic Structure |
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Chlorine exists in two isotopic forms, Cl-37 and Cl-35, but its atomic mass is 35.5. This indicates the ratio of Cl-37 and Cl-35 is approximately:
1. 1:2
2. 1:1
3. 1:3
4. 3:1
Subtopic: Number of Electron, Proton & Neutron |
64%
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Identify the pairs which are not of isotopes?
(a)
(b)
(c)
(d)
| 1. | (a), (d) | 2. | (b), (c) |
| 3. | (c), (d) | 4. | (b), (d) |
Subtopic: Number of Electron, Proton & Neutron |
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Two atoms are said to be isobars if:
| 1. | They have the same atomic number but different mass numbers. |
| 2. | They have the same number of electrons but a different number of neutrons. |
| 3. | They have the same number of neutrons but different numbers of electrons. |
| 4. | Sum of the number of protons and neutrons is the same but the number of protons is different. |
Subtopic: Number of Electron, Proton & Neutron |
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| Assertion (A): | All isotopes of a given element show the same type of chemical behaviour. |
| Reason (R): | The chemical properties of an atom are controlled by the number of electrons in the atom. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Number of Electron, Proton & Neutron |
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Isotope of an element contains \(19.23 \%\) more neutrons as compared to protons. The correct element along with its mass number is:
(Given Atomic number \(\mathrm{Fe: 26, Co: 27}\) )
1. \(\mathrm {^{56}Fe }\)
2. \({ }^{57} \mathrm{Fe}\)
3. \({ }^{57} \mathrm{Co}\)
4. \({ }^{60} \mathrm{Co}\)
(Given Atomic number \(\mathrm{Fe: 26, Co: 27}\) )
1. \(\mathrm {^{56}Fe }\)
2. \({ }^{57} \mathrm{Fe}\)
3. \({ }^{57} \mathrm{Co}\)
4. \({ }^{60} \mathrm{Co}\)
Subtopic: Number of Electron, Proton & Neutron |
58%
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