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Q. No.Given below are two statements:
Statement I:
Gallium (Ga) has a low melting point, so it is used in thermometers.
Statement II:
A substance having a melting point of 253 K can be measured by a Gallium thermometer.
1.
Statement I is false but Statement II is true.
2.
Both Statement I and Statement II are false.
3.
Both Statement I and Statement II are true.
4.
Statement I is true but Statement II is false.
Subtopic: Boron Family- Preparations, Properties & Uses |
Level 3: 35%-60%
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Given below are two statements:
| Statement I: | The stability of \(+1\) oxidation state increases down the group in Group-13. |
| Statement II: | The atomic radius of \(Ga~\) is greater than that of \(Al\). |
| 1. | Statement I is incorrect but Statement II is correct. |
| 2. | Both Statement I and Statement II are incorrect. |
| 3. | Both Statement I and Statement II are correct. |
| 4. | Statement I is correct but Statement II is incorrect. |
Subtopic: Boron Family- Preparations, Properties & Uses |
66%
Level 2: 60%+
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Given below are two statements:
| Statement -I | Blood acts as a buffer solution, and its pH is maintained at 7.4 by an acidic buffer. |
| Statement -II | The pH of blood is regulated by the presence of bicarbonate ions (\(\text{HCO}_3^-\)) and carbonic acid (\(\text{H}_2\text{CO}_3\)). |
| 1. | Statement I is false but Statement II is true. |
| 2. | Both Statement I and Statement II are false. |
| 3. | Both Statement I and Statement II are true. |
| 4. | Statement I is true but Statement II is false. |
Subtopic: Compounds of Carbon, Preparations, Properties & Uses |
70%
Level 2: 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 |
53%
Level 3: 35%-60%
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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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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 |
52%
Level 3: 35%-60%
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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 |
86%
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 |
67%
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 |
79%
Level 2: 60%+
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In the structure of silicon dioxide:
| 1. | There are double bonds between silicon and oxygen atoms. |
| 2. | Silicon atom is bonded to two oxygen atoms. |
| 3. | Each silicon atom is surrounded by two oxygen atoms and each oxygen atom is bonded to two silicon atoms. |
| 4. | Each silicon atom is surrounded by four oxygen atoms and each oxygen atom is bonded to two silicon atoms. |
Subtopic: Properties of Structure of SiO2 & Other Compounds |
73%
Level 2: 60%+
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