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Q. No.Given below are two statements:
Assertion A :
Boric acid is a weak acid
Reason R :
Boric acid is not able to release \(\mathrm{H^+}\) ion on its own. It receives \(\mathrm{OH^-}\) ion from water and releases \(\mathrm{H^+}\) ion.
1.
Both A and R are correct and R is the correct explanation of A.
2.
Both A and R are correct but R is NOT the correct explanation of A
3.
A is correct but R is not correct
4.
A is not correct but R is correct
Subtopic: Compounds of Boron- Preparations, Properties & Uses |
88%
Level 1: 80%+
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Among the following, basic oxide is:
1. \(\mathrm{SO}_3\)
2. \(\mathrm{SiO}_2\)
3. \(\mathrm{CaO}\)
4. \(\mathrm{Al}_2 \mathrm{O}_3\)
1. \(\mathrm{SO}_3\)
2. \(\mathrm{SiO}_2\)
3. \(\mathrm{CaO}\)
4. \(\mathrm{Al}_2 \mathrm{O}_3\)
Subtopic: Compounds of Boron- Preparations, Properties & Uses |
86%
Level 1: 80%+
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Match List-I with List-II.
Choose the most appropriate answer from the options given below:
1. (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
2. (A)-(IV), (B)-(III), (C)-(II), (D)-(I)
3. (A)-(II), (B)-(III), (C)-(IV), (D)-(I)
4. (A)-(I), (B)-(IV), (C)-(II), (D)-(III)
| List-I (Metal) |
List-II (Application) |
||
| A. | \(\text{Cs}\) | I. | High-temperature thermometer |
| B. | \(\text{Ga}\) | II. | Water repellent sprays |
| C. | \(\text{B}\) | III. | Photoelectric cells |
| D. | \(\text{Si}\) | IV. | Bulletproof vest |
Choose the most appropriate answer from the options given below:
1. (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
2. (A)-(IV), (B)-(III), (C)-(II), (D)-(I)
3. (A)-(II), (B)-(III), (C)-(IV), (D)-(I)
4. (A)-(I), (B)-(IV), (C)-(II), (D)-(III)
Subtopic: Anomalous Behaviour of B & C |
69%
Level 2: 60%+
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements, choose the correct answer from the options given below:
| Assertion (A): | Boron is unable to form \(\mathrm{BF}_6^{3-}\). |
| Reason (R): | The size of B is very small. |
In the light of the above statements, choose the correct answer from the options given below:
| 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. | (A) is False but (R) is True |
Subtopic: Compounds of Boron- Preparations, Properties & Uses |
Level 3: 35%-60%
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The metal that has very low melting point and its periodic position is closer to a metalloid is:
1. \(\mathrm {Al}\)
2. \(\mathrm {Ga}\)
3. \(\mathrm {Se}\)
4. \(\mathrm {In}\)
1. \(\mathrm {Al}\)
2. \(\mathrm {Ga}\)
3. \(\mathrm {Se}\)
4. \(\mathrm {In}\)
Subtopic: Carbon Family - Preparations, Properties & Uses |
70%
Level 2: 60%+
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Given below are two statements:
| Statement I: |
The chlorides of beryllium and aluminium have bridged chloride structures, are soluble in organic solvents, and act as Lewis bases. |
| Statement II: |
The hydroxides of beryllium and aluminium dissolve in excess alkali to form beryllate and aluminate ions, respectively. |
| 1. | Both Statement I and Statement II are true |
| 2. | Both Statement I and Statement II are false |
| 3. | Statement I is true but Statement II is false |
| 4. | Statement I is false but Statement II is true |
Subtopic: Anomalous Behaviour of B & C |
Level 3: 35%-60%
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Identify the correct statements for \(\text{B}_2\text{H}_6\) from those given below:
1. (A) and (E) only
2. (B), (C) and (E) only
3. (C) and (D) only
4. (C) and (E) only
| (A) | In \(\text{B}_2\text{H}_6,\) all B-H bonds are equivalent. |
| (B) | In \(\text{B}_2\text{H}_6,\) there are four 3-centre-2-electron bonds. |
| (C) | \(\text{B}_2\text{H}_6\) is a Lewis acid. |
| (D) | \(\text{B}_2\text{H}_6\) can be synthesized from both \(\text{BF}_3\) and \(\text{NaBH}_4.\) |
| (E) | \(\text{B}_2\text{H}_6\) is a planar molecule. |
1. (A) and (E) only
2. (B), (C) and (E) only
3. (C) and (D) only
4. (C) and (E) only
Subtopic: Boron Family- Preparations, Properties & Uses |
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Level 3: 35%-60%
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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 |
69%
Level 2: 60%+
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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 |
73%
Level 2: 60%+
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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 |
75%
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