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Q. No.Given below are the atomic numbers of some group 14 elements. The atomic number of the element with lowest melting point is :
1. 14
2. 6
3. 82
4. 50
Subtopic: Compounds of Carbon, Preparations, Properties & Uses |
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Subtopic: Boron Family- Preparations, Properties & Uses |
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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 |
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Among the following, the correct statement(s) is(are):
1. a, b, d
2. b, c
3. d, 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 \(\mathrm{AlCl}_3\). |
2. b, c
3. d, a
4. None of the above
Subtopic: Boron Family- Preparations, Properties & Uses |
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| Assertion (A): | Carbon forms two oxides \(CO\) and \(CO_2\) where \(CO\) is neutral whereas \(CO_2\) is acidic. |
| Reason (R): | \(CO_2\) will combine with water to give carbonic acid and \(CO\) is soluble in water. |
| 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. | Both (A) and (R) are False. |
Subtopic: Compounds of Carbon, Preparations, Properties & Uses |
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The element among the following that forms dioxide and evolves
hydrogen on treatment with steam is:
1. C
2. Si
3. Sn
4. Pb
hydrogen on treatment with steam is:
1. C
2. Si
3. Sn
4. Pb
Subtopic: Carbon Family - Preparations, Properties & Uses |
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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 |
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The correct option for the increasing order of 1st ionization enthalpy:\(Pb, Sn, Ge, Si \) is:
| 1. | \(Pb < Sn < Ge < Si \) |
| 2. | \(Sn < Pb < Si < Ge \) |
| 3. | \(Sn < Pb < Ge < Si\) |
| 4. | \( Pb <Sn < Si < Ge \) |
Subtopic: Carbon Family - Preparations, Properties & Uses |
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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 |
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Given below are two statements:
| Statement I: | In group 14, a significant increase in covalent radius is observed from carbon to silicon and thereafter, a small increase in covalent radius is observed from silicon to germanium. |
| Statement II: | A considerable difference in the values of electronegativity from silicon to lead is observed. |
| 1. | Both Statement I and Statement II are correct. |
| 2. | Both Statement I and Statement II are incorrect. |
| 3. | Statement I is correct but Statement II is incorrect. |
| 4. | Statement I is incorrect but Statement II is correct. |
Subtopic: Carbon Family - Preparations, Properties & Uses |
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