- 1(current)
Q. No.| Assertion (A): | Melting point of gallium is lesser than aluminum. |
| Reason (R): | Due to the inert pair effect, increased effective nuclear charge holds ns-electrons tightly. |
| 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: Boron Family- Preparations, Properties & Uses |
Level 3: 35%-60%
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Given below are two statements:
| Statement I: | Gallium (Ga) has a low melting point, so it is used in thermometers. |
| Statement II: | A substance having a melting point of 253 K can be measured by a Gallium thermometer. |
| 1. | Statement I is false but Statement II is true. |
| 2. | Both Statement I and Statement II are false. |
| 3. | Both Statement I and Statement II are true. |
| 4. | Statement I is true but Statement II is false. |
Subtopic: Boron Family- Preparations, Properties & Uses |
Level 3: 35%-60%
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The protective film of oxide on the surface of Al metal may be strengthened by:
1. galvanizing
2. cathodizing
3. sheradizing
4. anodizing
Subtopic: Boron Family- Preparations, Properties & Uses |
Level 4: Below 35%
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Subtopic: Boron Family- Preparations, Properties & Uses |
69%
Level 2: 60%+
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Among the following, the correct statement(s) is/are:
1. a, b and d
2. b and c
3. d and a
4. None of the above
| a. | \(\mathrm{Al}\left(\mathrm{CH}_3\right)_3\) has three–centre two-electron bonds in its dimeric structure. |
| b. | \(\mathrm{BH}_3\) has three–centre two-electron bonds in its dimeric structure. |
| c. | \(\mathrm{AlCl}_3\) has three–centre two-electron bonds in its dimeric structure. |
| d. | The Lewis acidity of \(\mathrm{BCl}_3\) is greater than that of \(\mathrm{AlCl}_3\). |
1. a, b and d
2. b and c
3. d and a
4. None of the above
Subtopic: Boron Family- Preparations, Properties & Uses |
54%
Level 3: 35%-60%
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Choose the correct set of elements X, Y, and Z, which belong to groups 13, 14, and 15, respectively, from the options below.
1. X = Th, Y = Pb, Z= Bi
2. X = In, Y = Sn, Z= At
3. X = Th, Y = Sn, Z= Sb
4. X = Tl, Y = Pb, Z= Bi
Subtopic: Boron Family- Preparations, Properties & Uses | Carbon Family - Preparations, Properties & Uses |
71%
Level 2: 60%+
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Arrange 1st ionization enthalpy of group 13 elements in increasing order:
\((Tl , In, Ga, Al) \)
\((Tl , In, Ga, Al) \)
| 1. | \(Tl < In < Ga < Al \) |
| 2. | \(In < Ga < Al < Tl \) |
| 3. | \( In < Al < Ga < Tl \) |
| 4. | \(Tl < In < Al < Ga \) |
Subtopic: Boron Family- Preparations, Properties & Uses |
64%
Level 2: 60%+
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- 1(current)
Q. No.
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