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) |
Match the species given in Column I with the hybridisation given in Column II.
Column I | Column II |
A. Boron in | i. sp2 |
B. Aluminium in | ii. sp3 |
C. Carbon in Buckminsterfullerene | iii. sp3d2 |
D. Germanium in |
Codes:
Options: | A | B | C | D |
1. | ii | iii | i | iii |
2. | i | i | iii | ii |
3. | iii | ii | ii | i |
4. | i | iii | ii | iii |
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. |
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. |
Quartz is extensively used as a piezoelectric material, it contains-
1. | Pb | 2. | Si |
3. | Ti | 4. | Sn |
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. |