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Q. No.| Assertion (A): | Melting point of gallium is lesser than aluminum. |
| Reason (R): | Due to the inert pair effect, increased effective nuclear charge holds ns-electrons tightly. |
| 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: Boron Family- Preparations, Properties & Uses |
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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 |
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The protective film of oxide on the surface of Al metal may be strengthened by:
(1) galvanizing
(2) cathodizing
(3) sheradizing
(4) anodizing
Subtopic: Boron Family- Preparations, Properties & Uses |
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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 |
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From NCERT
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Given below are two statements:
| Assertion (A): | Boric acid is considered a weak acid. |
| Reason (R): | Boric acid is not able to release H+ ions on its own. |
| 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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Subtopic: Compounds of Boron- Preparations, Properties & Uses |
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Consider the given two statements:
Options:
| Assertion (A): | Sn4+ ion is more stable than Sn+2. |
| Reason (R): | The inert pair effect dominates down the groups. |
| 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: Carbon Family - Preparations, Properties & Uses |
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Given below are two statements:
| Statement I: | In group 14, a significant increase in covalent radius is observed from carbon to silicon and thereafter, a small increase in covalent radius is observed from silicon to germanium. |
| Statement II: | A considerable difference in the values of electronegativity from silicon to lead is observed. |
| 1. | Both Statement I and Statement II are correct. |
| 2. | Both Statement I and Statement II are incorrect. |
| 3. | Statement I is correct but Statement II is incorrect. |
| 4. | Statement I is incorrect but Statement II is correct. |
Subtopic: Carbon Family - Preparations, Properties & Uses |
From NCERT
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The element among the following that forms dioxide and evolves
hydrogen on treatment with steam is:
1. C
2. Si
3. Sn
4. Pb
hydrogen on treatment with steam is:
1. C
2. Si
3. Sn
4. Pb
Subtopic: Carbon Family - Preparations, Properties & Uses |
From NCERT
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Subtopic: Carbon Family - Preparations, Properties & Uses |
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