Which of the following are true about Silicones?

They are formed by the hydrolysis of

R_{2} {S i C l}_{2}

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They are polymer made by

R_{2} {S i O}_{2}

units

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They are made up of

R_{2} {S i O}_{2}

units

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They are macromolecules

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Solution

The correct options are
A They are formed by the hydrolysis of $R_{2} {S i C l}_{2}$
B They are polymer made by $R_{2} {S i O}_{2}$ units
D They are macromolecules
Silicones are the macromolecular polymers formed by the hydrolysis of $R_{2} {S i C l}_{2}$ .
The hydrolysis of $R_{2} {S i C l}_{2}$ will give dialkyl silanediol which on polymerization will give a linear polymer.
These polymers are made by $R_{2} {S i O}_{2}$ units.
Thus, the options A, B, and D are correct.

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When resistors $R_{1}$ and $R_{2}$ are connected in series across a battery of potential difference $V,$ the power dissipated by the resistors are $P_{1}$ and $P_{2}$ respectively. When they are connected in parallel across a battery of potential difference $E,$ the power dissipated is $P_{3}$ and $P_{4}$ respectively. Which one of the following is true?