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Q. No.Subtopic: Nature of Compound |
83%
Level 1: 80%+
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First ionisation enthalpy of oxygen is less than that of nitrogen because of:
| 1. | More shielding of paired electrons in 2p orbital of oxygen. |
| 2. | Half-filled stable configuration of nitrogen. |
| 3. | More Z effective of oxygen. |
| 4. | Small atomic size of oxygen. |
Subtopic: Ionization Energy (IE) |
87%
Level 1: 80%+
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The correct order of radii is:
1. N < Be < B
2. \(\mathrm{F}^{-}<\mathrm{O}^{2-}<\mathrm{N}^{3-} \)
3. Na < Li < K
4. \(\mathrm{Fe}^{3+}<\mathrm{Fe}^{2+}<\mathrm{Fe}^{4+} \)
1. N < Be < B
2. \(\mathrm{F}^{-}<\mathrm{O}^{2-}<\mathrm{N}^{3-} \)
3. Na < Li < K
4. \(\mathrm{Fe}^{3+}<\mathrm{Fe}^{2+}<\mathrm{Fe}^{4+} \)
Subtopic: Atomic Size |
91%
Level 1: 80%+
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Which of the following will have a positive value of electron gain enthalpy?
1. N
2. Be
3. He
4. All of the above
1. N
2. Be
3. He
4. All of the above
Subtopic: Electron Affinity (EA) |
78%
Level 2: 60%+
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Incorrect statement related to the modern periodic table is:
| 1. | The p-block has 6 columns because a maximum of 6 electrons can occupy all the orbitals in a p-shell. |
| 2. | The d-block has 8 columns because a maximum of 8 electrons can occupy all the orbitals in a d-subshell. |
| 3. | Each block contains a number of columns equal to the number of electrons that can occupy that subshell. |
| 4. | The block indicates a value of azimuthal quantum number (l) for the last subshell that received electrons in building up the electronic configuration. |
Subtopic: Modern Periodic Table & Periodicity |
85%
Level 1: 80%+
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The element having atomic number 55 is a member of:
1. Group 1
2. Group 3
3. Group 15
4. Group 17
1. Group 1
2. Group 3
3. Group 15
4. Group 17
Subtopic: Modern Periodic Table & Periodicity |
82%
Level 1: 80%+
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The correct order of increasing metallic character is given by:
1. P < Si < Be < Na
2. Na < Be < Si < P
3. Be < Na < P < Si
4. Si < P < Na < Be
1. P < Si < Be < Na
2. Na < Be < Si < P
3. Be < Na < P < Si
4. Si < P < Na < Be
Subtopic: Modern Periodic Table & Periodicity |
79%
Level 2: 60%+
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Subtopic: Modern Periodic Table & Periodicity |
82%
Level 1: 80%+
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| Assertion (A): | Na+ and Al3+ are isoelectronic but the magnitude of ionic radius of Al3+ is less than that of Na+. |
| Reason (R): | The magnitude of effective nuclear charge of the outer shell electrons in Al3+ is greater than that in Na+. |
| 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 and (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Atomic Size |
87%
Level 1: 80%+
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| Assertion (A): | The ionic size of Mg2+>Al3+. |
| Reason (R): | In isoelectronic species, the greater the nuclear charge, the smaller the size. |
| 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: Atomic Size |
85%
Level 1: 80%+
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