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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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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 |
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Level 3: 35%-60%
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The Correct order of stability of the +1 oxidation state for the following is:
1. \(Al^+>Ga^+>ln^+>Tl^+ \)
2. \(Tl^+>ln^+>Ga^+>Al^+ \)
3. \(Tl^+>ln^+>Al^+>Ga^+\)
4. \(Tl^+>Ga^+>ln^+>Al^+\)
1. \(Al^+>Ga^+>ln^+>Tl^+ \)
2. \(Tl^+>ln^+>Ga^+>Al^+ \)
3. \(Tl^+>ln^+>Al^+>Ga^+\)
4. \(Tl^+>Ga^+>ln^+>Al^+\)
Subtopic: Carbon Family - Preparations, Properties & Uses |
90%
Level 1: 80%+
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Borazine, also known as inorganic benzene, can be prepared by the reaction of 3-equivalents of "X" with 6-equivalents of "Y". "X" and "Y", respectively are:
1. B(OH)3 and NH3
2. B2H6 and NH3
3. B2H6 and HN3
4. NH3 and B2O3
1. B(OH)3 and NH3
2. B2H6 and NH3
3. B2H6 and HN3
4. NH3 and B2O3
Subtopic: Boron Family- Preparations, Properties & Uses |
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Level 2: 60%+
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When borax is heated with CoO on a platinum loop, blue coloured bead formed is:
1. B2O3
2. Co(BO2)2
3. CoB4O7
4. Co[B4O5(OH)4]
1. B2O3
2. Co(BO2)2
3. CoB4O7
4. Co[B4O5(OH)4]
Subtopic: Boron Family- Preparations, Properties & Uses |
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| Assertion (A): | Carbon forms two oxides \(CO\) and \(CO_2\) where \(CO\) is neutral whereas \(CO_2\) is acidic. |
| Reason (R): | \(CO_2\) will combine with water to give carbonic acid and \(CO\) is soluble in water. |
| 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. | Both (A) and (R) are False. |
Subtopic: Compounds of Carbon, Preparations, Properties & Uses |
Level 3: 35%-60%
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The correct order of bond strength of
C- C, Si -Si ,Ge – Ge, Sn – Sn is:
1. C-C > Si-Si > Ge-Ge > Sn-Sn
2. C-C > Si- Si > Ge- Ge ≈ Sn - Sn
3. C- C > Si -Si < Ge – Ge < Sn – Sn
4. C- C > Si – Si > Sn – Sn > Ge - Ge
C- C, Si -Si ,Ge – Ge, Sn – Sn is:
1. C-C > Si-Si > Ge-Ge > Sn-Sn
2. C-C > Si- Si > Ge- Ge ≈ Sn - Sn
3. C- C > Si -Si < Ge – Ge < Sn – Sn
4. C- C > Si – Si > Sn – Sn > Ge - Ge
Subtopic: Carbon Family - Preparations, Properties & Uses |
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Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behavior is that graphite :
| 1. | is a non-crystalline substance. |
| 2. | is an allotropic form of diamond. |
| 3. | has molecules of variable molecular masses like polymers. |
| 4. | has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interplate bonds. |
Subtopic: Structure & Properties of Allotropes of C |
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Level 1: 80%+
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Aluminium chloride exists as dinner, Al2Cl6 in the solid state as well as in the solution of non-polar solvents such as benzene. When dissolved in acidified aqueous solution, it gives:
1. \(\mathrm{Al}^{3+}+3 \mathrm{Cl}^{-}\)
2. \(\left[\mathrm{Al}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}+3 \mathrm{Cl}^{-} \)
3. \(\left[\mathrm{Al}(\mathrm{OH})_{6}\right]^{3-}+3 \mathrm{HCl}\)
4. \(\mathrm{Al}_{2} \mathrm{O}_{3}+6 \mathrm{HCl}\)
Subtopic: Boron Family- Preparations, Properties & Uses |
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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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