Home
Class 12
CHEMISTRY
The monomer unit of silicon, a water rep...

The monomer unit of silicon, a water repellant, acid resistantl,and heat resistant,polymer,is:

A

Si

B

`SiO_(2)`

C

`R_(2)SiO`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
C
The mono unit of .Si. a water repellant, acid resistance and heat resistance, polymer is `R_(2)SiO`
Promotional Banner

Similar Questions

Explore conceptually related problems

Silicones are water repelling in nature due to.

Silicones repel water due to:

Silicones are synthetic polymers containing repeated R_2 SiO units . Since the empirical formula is that of a ketone (R_2 CO) , the name Silicone has been given to these materials . Silicone can be made into oils , rubbery elastomers and resins . They find a variety of applications because of their chemical inertness , water repelling nature, heat resistance and good electrical insulating property . Commerically silicon polymers are usually synthesised by the hudrolysis of R_2 SiCl_2 [R = Methyl (Me ) or phenyl ( phi)] . If we start with SiMeCl_3 as the starting material silicones formed is :

A conductor of length L is placed along the x - axis , with one of its ends at x = 0 and the other at x = L. If the rate of flow of heat energy through the conduct is constant and its thermal resistance per unit length is also constant , then Which of the following graphs is/are correct ?

Assertion (A) : Silicones are water repelling in nature Reason (R) : Silicones are organosilicon polymers, which have (-R_(2)SiO-) as repeating unit.

Silicones are sunthetic polyners conitainging repeated R_2 SiO units . Since the empirical formula is that of a ketone (R_2 CO) , the name Silicone has eeen given to these materils . Siliconse can be makde intio oils , rubbery eleastomers and resins . They find a varely of appoications because of their chemical inctness , water repelling nature m heat resistance and good electical insulationg property . Commerical silicon polumers are usuallly metghly synthesised by the hudroluysis of R_2 SiCl_2 [R = Methyl (Me ) or phenyl ( phi)] . If we mix SiMe_3Cl with SiMe_2Cl_2 , we get silicones of the type .

Given below is the process to separate the contents of a living tissue by acid treatment and a list of certain observations . Segregate the observations under filtrate (A) and retentate (B) and select the correct combination . 1. Molecular weight ranging from 18 - 800 daltons approx. 2. Proteins, nucleic acids , polysaccharides and lipids 3. Chemicals more than 800 daltons molecular weight 4. Has monomers 5. Generally has polymers

Once there was heavy downpour for about 3 hours in the early morning. Irfan and his family were finding it difficulat to carry out their daily morning chores as the sewer water was flowing back into the toilits, th road in front of their house was flooded with water and they could not move out. On this very serious problem Irfan called a meeting of all the residents. In the meeting Irfan discussed th problem and said that we as using too much polythene bags and other plastic items which we throw here and there. All these move into the drains and sewer lines which get choked and do not allow flow of water. As these are non-biodegradable, they remain as such for a long time. So to overcome this problem, we should use bags made up of cloth or jute which are biodegradable. (i) Answer the following questions : (i) Name a polymer which is biodegradable. Write the sturctures of monomers and the repeating unit. (ii) Write two uses of this polymer. (iii) Write any two values shown by Irfan.

When a strong acid, strong base or their salt are dissolved in water, they are completely ionised. If a strong acid is added to a strong base, H^(+) ions from the former combine with OH^(-) ions of the latter forming water. The formation of each water molecule liberates a certain quantity of energy and the reaction is exothermic. The heat liberated when one mole of water is formed by combining hydrochloric acid sodium hydroxide is 13.7 kcal. The heat liberated when one mole of water is formed by combining sulphuic acid and sodium hydroxide is

0.5 g of benzoic acid was subjected to combustion in a bomb calorimeter at 15^(@)C when the temperature of the calorimeter system (including water) was found to rise by 0.55^(@)C . Calculate the heat of combustion of benzoic acid (i) at constant volume and (ii) at constant pressure. the thermal capacity of the calorimeter including water was found to be 23.85 kJ.