- 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
4. 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.
| 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.
Cement, the important building material is a mixture of oxides of several elements. Besides calcium, iron, and sulphur oxides of elements of which of the group(s) are present in the mixture?
1. Group 2
2. Groups 2, 13, and 14
3. Groups 2, and 13
4. Groups 2, and 14
Given below are two statements:
| Assertion (A): | Silicones are water-repelling in nature. |
| Reason (R): | Silicones are organosilicon polymers, which have ( - R 2 SiO - ) 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. |
- 1(current)
Q. No.
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