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 strong Lewis acid.
4.
Common oxidation states of group 14 elements are +1 and +3.
Subtopic: Structure & Properties of Allotropes of C |
82%
Level 1: 80%+
NEET - 2024
Hints
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 |
74%
Level 2: 60%+
NEET - 2024
Hints
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 |
66%
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 |
75%
Level 2: 60%+
NEET - 2023
Hints
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
Hints
Match the allotropes of cabon 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 |
76%
Level 2: 60%+
NEET - 2023
Hints
In the reaction given below, the product "X" is :
\(\mathrm{Na_2B_4O_7\xrightarrow{\text{ heat }~~}X+NaBO_2 }\)
\(\mathrm{Na_2B_4O_7\xrightarrow{\text{ heat }~~}X+NaBO_2 }\)
| 1. | H3BO3 | 2. | B2O3 |
| 3. | Na2B2O5 | 4. | NaB3O5 |
Subtopic: Compounds of Boron- Preparations, Properties & Uses |
65%
Level 2: 60%+
NEET - 2022
Hints
Match List-I with List-II:
Choose the correct answer from the options given below :
| List-I (Compounds) |
List-II (Molecular formula) |
||
| (a) | Borax | (i) | NaBO2+B2O3 |
| (b) | Kernite | (ii) | Na2B4O7.4H2O |
| (c) | Orthoboric acid | (iii) | H3BO3 |
| (d) | Borax bead | (iv) | Na2B4O7.10H2O |
Choose the correct answer from the options given below :
| (a) | (b) | (c) | (d) | |
| 1. | (iv) | (ii) | (iii) | (i) |
| 2. | (ii) | (iv) | (iii) | (i) |
| 3. | (iii) | (i) | (iv) | (ii) |
| 4. | (i) | (iii) | (iv) | (ii) |
Subtopic: Compounds of Boron- Preparations, Properties & Uses |
82%
Level 1: 80%+
NEET - 2022
Hints
The chain length of silicones can be controlled by adding:
| 1. | \(\mathrm{CH_3SiCl_3}\) | 2. | \(\mathrm{SiCl_4}\) |
| 3. | \(\mathrm{(CH_3)_2SiCl_2}\) | 4. | \(\mathrm{(CH_3)_3SiCl}\) |
Subtopic: Properties of Structure of SiO2 & Other Compounds |
67%
Level 2: 60%+
NEET - 2022
Hints
Which of the following is the correct statement?
1. Ga+ is more stable than ln+.
2. Al+ is more stable than ln+.
3. Ga+ is more stable than Al+.
4. Al+ is more stable than Ga+.
Subtopic: Boron Family- Preparations, Properties & Uses |
81%
Level 1: 80%+
NEET - 2022
Hints
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