- 1(current)
Q. No.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 |
90%
Level 1: 80%+
Hints
What property identifies two atoms as isobars?
| 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. | The sum of the number of protons and neutrons is the same but the number of protons is different. |
Subtopic: Number of Electron, Proton & Neutron |
72%
Level 2: 60%+
Hints
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 |
63%
Level 2: 60%+
Hints
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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 |
66%
Level 2: 60%+
Hints
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 |
90%
Level 1: 80%+
Hints
- 1(current)
Q. No.
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