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Q. No.Among the following statements, the correct set of statements are:
| a. | \(B_2H_6 \) is Lewis acid. |
| b. | \(B_2H_6 \) has a planar structure. |
| c. | All B-H Bond lengths are equal in \(B_2H_6 \). |
| d. | In \(B_2H_6,\) four \(3C-2e^- \) bonds are present. |
| e. | \(B_2H_6 \) can be prepared by the reaction of \(BF_3 \) and \(NaBH_4 \). |
| 1. | a, b, c, d, e | 2. | a, e |
| 3. | a, b | 4. | d, e |
Subtopic: Compounds of Boron- Preparations, Properties & Uses |
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Level 3: 35%-60%
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The correct statement about B2H6 is:
| 1. | The terminal B–H bonds have less p-character when compared to bridging bonds. |
| 2. | The two B–H–B bonds are not of the same length. |
| 3. | All B–H–B angles are 120°. |
| 4. | Its fragment, BH3, behaves as a Lewis base. |
Subtopic: Compounds of Boron- Preparations, Properties & Uses |
54%
Level 3: 35%-60%
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Subtopic: Compounds of Boron- Preparations, Properties & Uses |
74%
Level 2: 60%+
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The structure of diborane (B2H6) contains:
| 1. | four 2C-2e- bonds and four 3C-2e- bonds |
| 2. | two 2C-2e- bonds and two 3C-3e- bonds |
| 3. | two 2C-2e- bonds and four 3C-2e- bonds |
| 4. | four 2C-2e- bonds and two 3C-2e- bonds |
Subtopic: Compounds of Boron- Preparations, Properties & Uses |
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Level 2: 60%+
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How many of the following are electron-deficient compounds?
\(\mathrm{B}_{2} \mathrm{H}_{6}, \mathrm{PH}_{3}, \mathrm{LiH}_{}, \mathrm{BCl}_{3}, \mathrm{NH}_{3} \)
1. Zero (0)
2. One (1)
3. Two (2)
4. Three (3)
\(\mathrm{B}_{2} \mathrm{H}_{6}, \mathrm{PH}_{3}, \mathrm{LiH}_{}, \mathrm{BCl}_{3}, \mathrm{NH}_{3} \)
1. Zero (0)
2. One (1)
3. Two (2)
4. Three (3)
Subtopic: Compounds of Boron- Preparations, Properties & Uses |
58%
Level 3: 35%-60%
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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 |
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Level 1: 80%+
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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 |
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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 |
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Two elements of p-block can form following halides \( XF_3\) & \(YF_3 .\) If \(XF_3\) can act as Lewis acid and \(YF_3\) can act as Lewis base. Then determine the hybridization of ‘X’ & ‘Y’ in \(XF_3 ~\& ~YF_3\) respectively:
1. \(sp^2 , sp^ 2\)
2. \( sp^3 , sp^ 2 \)
3. \( sp^2 , sp^ 3 \)
4. \( sp^3 , sp^ 3\)
1. \(sp^2 , sp^ 2\)
2. \( sp^3 , sp^ 2 \)
3. \( sp^2 , sp^ 3 \)
4. \( sp^3 , sp^ 3\)
Subtopic: Boron Family- Preparations, Properties & Uses | Compounds of Boron- Preparations, Properties & Uses |
81%
Level 1: 80%+
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