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Q. No.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 |
| 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 |
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Identify the correct relationship of stability from the options provided.
1. \(TlI > TlI_3\)
2. \(TlCl_3 > TlCl\)
3. \(InI_3 > InI \)
4. \(AlCl > AlCl_3 \)
1. \(TlI > TlI_3\)
2. \(TlCl_3 > TlCl\)
3. \(InI_3 > InI \)
4. \(AlCl > AlCl_3 \)
Subtopic: Compounds of Boron- Preparations, Properties & Uses |
69%
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NEET - 2023
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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 |
72%
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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 |
62%
From NCERT
NEET - 2023
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Which of the following statement 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 two centre two-electron bonds. |
| 4. | The four terminal Hydrogen atoms and the two Boron atoms lie in one plane. |
Subtopic: Compounds of Boron- Preparations, Properties & Uses |
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Choose the correct statement:
| 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 |
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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 |
79%
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The chain length of silicones can be controlled by adding:
1. \(CH_3SiCl_3\)
2. \(SiCl_4\)
3. \((CH_3)_2SiCl_2\)
4. \((CH_3)_3SiCl\)
Subtopic: Properties of Structure of SiO2 & Other Compounds |
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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 |
| (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 |
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\(Na_2B_4O_7\xrightarrow{\text{ heat }~~}X+NaBO_2 \)
in the above reaction the product "X" is :
in the above reaction the product "X" is :
| 1. | H3BO3 | 2. | B2O3 |
| 3. | Na2B2O5 | 4. | NaB3O5 |
Subtopic: Compounds of Boron- Preparations, Properties & Uses |
65%
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