The correct statement regarding polymeric silicon dioxide is -
1. | Each silicon atom is surrounded by four oxygen atoms and each oxygen atom is bonded to two silicon atoms. |
2. | Each silicon atom is surrounded by two oxygen atoms and each oxygen atom is bonded to two silicon atoms. |
3. | Silicon atom is bonded to two oxygen atoms. |
4. | These are double bonds between silicon and oxygen atoms. |
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A compound among the following that is used in cosmetic surgery is -
1. | Silica | 2. | Silicates |
3. | Silicones | 4. | Zeolites |
When silicon is boiled with caustic soda solution, the gas is evolved is-
1.
2.
3.
4. None of the above
Compound (A) is -
1. | A linear silicone | 2. | A chlorosilane |
3. | A linear silane | 4. | A network silane |
A compound among the following that is not a monomer for a high molecular mass silicone polymer is-
1.
2.
3.
4.
Silicon carbide is used as:
1. | Dehydrating agent | 2. | Abrasive |
3. | Solvent | 4. | Catalyst |
on complete hydrolysis forms:
1.
2.
3.
4. None of the above.
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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. |
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An anion present in the chain structure silicate is -
1.
2.
3.
4.
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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. |
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