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Q. No.Among the elements In, Tl, Al, Pb, Sn, and Ge, what are the most stable oxidation states for the element with the highest first ionisation enthalpy and the element with the lowest first ionisation enthalpy, respectively?
1.
+2 and +3
2.
+4 and +3
3.
+4 and +1
4.
+1 and +4
Subtopic: Boron Family- Preparations, Properties & Uses | Carbon Family - Preparations, Properties & Uses |
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Subtopic: Boron Family- Preparations, Properties & Uses |
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Which of the following is the correct order ?
1. \(\mathrm{B}<\mathrm{Ga}<\mathrm{Al}<\mathrm{In}<\mathrm{Tl}\) (Atomic radius)
2. \(\mathrm{B}>\mathrm{Ga}>\mathrm{Tl}>\mathrm{In}\) (First Ionisation enthalpy)
3. \(\mathrm{Tl}>\mathrm{In}>\mathrm{Ga}>\mathrm{B}>\mathrm{Al}\) (Density)
4. \(\mathrm{B}<\mathrm{Ga}<\mathrm{Al}<\mathrm{In}<\mathrm{Tl}\) (EN order)
1. \(\mathrm{B}<\mathrm{Ga}<\mathrm{Al}<\mathrm{In}<\mathrm{Tl}\) (Atomic radius)
2. \(\mathrm{B}>\mathrm{Ga}>\mathrm{Tl}>\mathrm{In}\) (First Ionisation enthalpy)
3. \(\mathrm{Tl}>\mathrm{In}>\mathrm{Ga}>\mathrm{B}>\mathrm{Al}\) (Density)
4. \(\mathrm{B}<\mathrm{Ga}<\mathrm{Al}<\mathrm{In}<\mathrm{Tl}\) (EN order)
Subtopic: Boron Family- Preparations, Properties & Uses |
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Given below are two statements:
| Statement I: | Atomic radius of \(\mathrm{Al}\) is less than that of \(\mathrm{Ga}\). |
| Statement II: | The ionic radius of \(\mathrm{Al}^{3+}\) is less than \(\mathrm{Ga}^{3+}\). |
| 1. | Both Statement are correct. |
| 2. | Statement I is correct but Statement II is incorrect. |
| 3. | Statement I is incorrect but Statement II is correct. |
| 4. | Both Statement are incorrect. |
Subtopic: Boron Family- Preparations, Properties & Uses |
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Given below are the atomic numbers of some group 14 elements. Find out the atomic number of the element with the lowest melting point :
1. 14
2. 6
3. 82
4. 50
1. 14
2. 6
3. 82
4. 50
Subtopic: Compounds of Carbon, Preparations, Properties & Uses |
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The outermost electronic configuration of a group 13 element, E, is \(4s^2 , 4p^1 .\) Determine the electronic configuration of an element of the p-block from period five, placed diagonally to element E:
1. \(\mathrm{[Xe]5d^{10}6s^26p^2}\)
2. \(\mathrm{[Ar]3d^{10}4s^24p^2}\)
3. \(\mathrm{[Kr]3d^{10}4s^24p^2}\)
4. \(\mathrm{[Kr]4d^{10}5s^25p^2}\)
1. \(\mathrm{[Xe]5d^{10}6s^26p^2}\)
2. \(\mathrm{[Ar]3d^{10}4s^24p^2}\)
3. \(\mathrm{[Kr]3d^{10}4s^24p^2}\)
4. \(\mathrm{[Kr]4d^{10}5s^25p^2}\)
Subtopic: Boron Family- Preparations, Properties & Uses | Carbon Family - Preparations, Properties & Uses |
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Given below are two statements:
| Assertion (A): | Aluminium is extracted from bauxite by the electrolysis of a molten mixture of \(Al_2O_3\) with cryolite. |
| Reason (R): | The oxidation state of Al in cryolite is \(+3\) |
| 1. | (A) is false but (R) is true. |
| 2. | (A) is true but (R) is false. |
| 3. | Both (A) and (R) are correct and (R) is the correct explanation of (A). |
| 4. | Both (A) and (R) are correct and (R) is not the correct explanation of (A). |
Subtopic: Boron Family- Preparations, Properties & Uses |
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In which one of the following molecules is the strongest back donation of an electron pair from halide to boron expected?
| 1. | \(BI_3\) | 2. | \(BBr_3\) |
| 3. | \(BCl_3\) | 4. | \(BF_3\) |
Subtopic: Boron Family- Preparations, Properties & Uses |
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Which of the following options is incorrect:
1. Carbon can have negative oxidation state in its compounds.
2. \(CO_2\) is most acidic oxide among oxides of group-14 elements.
3. Maximum covalency of carbon is four.
4. Carbon has least catenation property in group 14.
1. Carbon can have negative oxidation state in its compounds.
2. \(CO_2\) is most acidic oxide among oxides of group-14 elements.
3. Maximum covalency of carbon is four.
4. Carbon has least catenation property in group 14.
Subtopic: Boron Family- Preparations, Properties & Uses | Carbon Family - Preparations, Properties & Uses |
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Identify the three salts X, Y, and Z respectively when salt (X) is soluble in water, salt (Y) is sparingly soluble in water and salt (Z) is soluble in hot water only:
1. \(AgCl, Hg_2Cl_2 , PbCl_2 \)
2. \(AlCl_3 , AgCl, PbCl_2\)
3. \(BaCl_2 , PbCl_2 , Hg_2Cl_2\)
4. \( MgCl_2 , Hg_2Cl_2 , CaCl_2 \)
1. \(AgCl, Hg_2Cl_2 , PbCl_2 \)
2. \(AlCl_3 , AgCl, PbCl_2\)
3. \(BaCl_2 , PbCl_2 , Hg_2Cl_2\)
4. \( MgCl_2 , Hg_2Cl_2 , CaCl_2 \)
Subtopic: Boron Family- Preparations, Properties & Uses | Carbon Family - Preparations, Properties & Uses |
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