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Q. No.Identify the incorrect statement from the following :
| 1. | Carbon has the ability to form pπ-pπ multiple bond with itself. |
| 2. | \(\mathrm{EC}_3\) (E = B and Al) is a monomer when E = B and a dimer when E = Al. |
| 3. | Oxygen exhibits only 2 oxidation states. |
| 4. | The order of catenation property of Group 14 elements is C>> Si > Ge ≈ Sn. |
Subtopic: Carbon Family - Preparations, Properties & Uses | Structure & Properties of Allotropes of C |
71%
Level 2: 60%+
NEET - 2026
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The correct statement is:
| 1. | Aluminium has five valence orbitals. |
| 2. | Boron has a maximum covalency of four. |
| 3. | Beryllium has three valence orbitals. |
| 4. | Magnesium has a maximum covalency of four. |
Subtopic: Boron Family- Preparations, Properties & Uses |
52%
Level 3: 35%-60%
NEET - 2026
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Identify the Incorrect statement:
| 1. | Carbon has the tendency to form chains and rings with itself. |
| 2. | Silicon and Germanium are useful in semiconductor industry. |
| 3. | Boron trifluoride is a Lewis acid. |
| 4. | Common oxidation states of group 14 elements are +1 and +3. |
Subtopic: Structure & Properties of Allotropes of C |
80%
Level 1: 80%+
NEET - 2024
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Identify the incorrect statement:
| 1. | The relative stability of group 13 elements in +1 oxidation state varies as: Al < Ga < In < Tl. |
| 2. | Boron trioxide is acidic; aluminium and gallium trioxides are amphoteric, while indium and thallium trioxides are basic. |
| 3. | The hybridisation of Al in \(\left[\mathrm{Al}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}\) is \(\text{d}^2\text{ sp}^3.\) |
| 4. | Two isotopes of Boron, namely \(^{10}\!\mathrm{~B}(19 \%)\) and , \(^{11}\! \mathrm{~B}(81 \%)\) are known. |
Subtopic: Boron Family- Preparations, Properties & Uses |
72%
Level 2: 60%+
NEET - 2024
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Match the allotropes of carbon given in List I with the respective characteristics given in List II:
| List-I | List-II | ||
| A. | Coke | I. | Carbon atoms are sp3 hybridised. |
| B. | Diamond | II. | Used as a dry lubricant |
| C. | Fullerene | III. | Used as a reducing agent |
| D. | Graphite | IV. | Cage like molecules |
Choose the correct answer from the options given below:
| Options: | (A) | (B) | (C) | (D) |
| 1. | III | IV | I | II |
| 2. | II | IV | I | III |
| 3. | IV | I | II | III |
| 4. | III | I | IV | II |
Subtopic: Compounds of Carbon, Preparations, Properties & Uses |
75%
Level 2: 60%+
NEET - 2023
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Identify the correct relationship of stability from the options provided:
| 1. | \(\mathrm{TlI > TlI_3}\) | 2. | \(\mathrm{TlCl_3 > TlCl}\) |
| 3. | \(\mathrm{InI_3 > InI }\) | 4. | \(\mathrm{AlCl > AlCl_3 }\) |
Subtopic: Compounds of Boron- Preparations, Properties & Uses |
76%
Level 2: 60%+
NEET - 2023
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The \(E^{\ominus}\) values for
\(\begin{aligned} & \mathrm{Al}^+ / \mathrm{Al}=+0.55 \mathrm{~V} \text { and } \mathrm{Tl}^{+} / \mathrm{Tl}=-0.34 \mathrm{~V} \\ & \mathrm{Al}^{3+} / \mathrm{Al}=-1.66 \mathrm{~V} \text { and } \mathrm{Tl}^{3+} / \mathrm{Tl}=+1.26 \mathrm{~V} \end{aligned} \)
The incorrect statement among the following is:
1. Al is more electropositive than TI.
2. Tl3+ is a good reducing agent than Tl1+.
3. Al+ is unstable in solution.
4. Tl can be easily oxidized to Tl+ as compared to Tl3+.
\(\begin{aligned} & \mathrm{Al}^+ / \mathrm{Al}=+0.55 \mathrm{~V} \text { and } \mathrm{Tl}^{+} / \mathrm{Tl}=-0.34 \mathrm{~V} \\ & \mathrm{Al}^{3+} / \mathrm{Al}=-1.66 \mathrm{~V} \text { and } \mathrm{Tl}^{3+} / \mathrm{Tl}=+1.26 \mathrm{~V} \end{aligned} \)
The incorrect statement among the following is:
1. Al is more electropositive than TI.
2. Tl3+ is a good reducing agent than Tl1+.
3. Al+ is unstable in solution.
4. Tl can be easily oxidized to Tl+ as compared to Tl3+.
Subtopic: Boron Family- Preparations, Properties & Uses |
65%
Level 2: 60%+
NEET - 2023
Hints
Select the element (M) whose trihalides cannot be hydrolysed to form [M(H2O)6]3+.
| 1. | Ga | 2. | In |
| 3. | Al | 4. | B |
Subtopic: Boron Family- Preparations, Properties & Uses |
74%
Level 2: 60%+
NEET - 2023
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Which of the following statements is not correct about diborane?
| 1. | Both the boron atoms are sp2 hybridised. |
| 2. | There are two 3-centre-2-electron bonds. |
| 3. | The four terminal B-H bonds are 2-centre-2-electron bonds. |
| 4. | The four terminal hydrogen atoms and the two boron atoms lie in one plane. |
Subtopic: Compounds of Boron- Preparations, Properties & Uses |
62%
Level 2: 60%+
NEET - 2022
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Which of the following statements is correct regarding the structure and properties of diamond and graphite?
| 1. | Both diamond and graphite are used as dry lubricants. |
| 2. | Diamond and graphite have a two-dimensional network. |
| 3. | Diamond is covalent, and graphite is ionic. |
| 4. | Diamond is sp³ hybridised, and graphite is sp² hybridized. |
Subtopic: Structure & Properties of Allotropes of C |
83%
Level 1: 80%+
NEET - 2022
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