- 1(current)
Q. No.Me3SiCl is used during polymerization of organ silicones because
| a. | Chain length of organic silicone polymers can be controlled by adding |
| b. | blocks the end terminal of silicone polymer. |
| c. | improves the quality and yield of the polymer. |
| d. | acts as a catalyst during polymerization. |
Choose the correct option:
| 1. | (a, b) | 2. | (b, c) |
| 3. | (c, d) | 4. | (a, d) |
Subtopic: Â Properties of Structure of SiO2 & Other Compounds |
 82%
Level 1: 80%+
Hints
Match the species in Column-I with their corresponding hybridisation in Column-II:
| Column-I (Species) | Column-II (Hybridisation) | ||
| A. | Boron in | i. | sp2 |
| B. | Aluminium in | ii. | sp3 |
| C. | Carbon in Buckminsterfullerene | iii. | sp3d2 |
| D. | Germanium in |
Codes:
| A | B | C | D | |
| 1. | ii | iii | i | iii |
| 2. | i | i | iii | ii |
| 3. | iii | ii | ii | i |
| 4. | i | iii | ii | iii |
Subtopic: Â Structure & Properties of Allotropes of C |Â Properties of Structure of SiO2 & Other Compounds |
 84%
Level 1: 80%+
Hints
Given below are two statements:
| Assertion (A): | If aluminium atoms replace a few silicon atoms in three-dimensional network of silicon dioxide, the overall structure acquires a negative charge. |
| Reason (R): | Aluminium is trivalent while silicon is tetravalent. |
| 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: Â Properties of Structure of SiO2 & Other Compounds |
 64%
Level 2: 60%+
Hints
Silicon has a strong tendency to form polymers like silicones. The chain length of silicone polymer can be controlled by adding
| 1. | 2. | ||
| 3. | 4. |
Subtopic: Â Properties of Structure of SiO2 & Other Compounds |
 88%
Level 1: 80%+
Hints
Subtopic: Â Properties of Structure of SiO2 & Other Compounds |
 85%
Level 1: 80%+
Hints
Given below are two statements:
| Assertion (A): | Silicones are water-repelling in nature. |
| Reason (R): | Silicones are organosilicon polymers, which have ( - R2SiO - ) as repeating units. |
| 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: Â Properties of Structure of SiO2 & Other Compounds |
 57%
Level 3: 35%-60%
Hints
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- 1(current)
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