1. : Which of the following is the bond energy of the Si-O bond?
(A) 502 kJ/mol
(B) 37 kJ/mol
(C) 248 kJ/mol
(D) 115 kJ/mol
2. : _______ is incorrect.
(A) The boiler before the water enters into the boiler internal treatment is carried out outside
(B) By blow-down operations, internal treatment methods are followed
(C) In low-pressure boilers internal treatment is required
(D) A corrective method of internal treatment is
3. : Which of the following is the catalyst used in the preparation of poly-siloxanes?
(A) Benzoyl peroxide
(B) Cumene hydroperoxide
(C) Lewis acid
(D) Grignard reagent
4. : ____________ is tri-functional.
(A) Trimethyl silicon chloride
(B) Momethyl silicon chloride
(C) Tetramethyl silicon chloride
(D) Dimethyl silicon chloride
5. : Potable water treatment does not involve which one?
(A) Disinfection
(B) Demineralisation
(C) Coagulation
(D) Sedimentation
6. : Which of the following is the configuration from the ligand of highest priority to the ligand of lowest priority if our eyes travel in a counter-clockwise direction?
(A) R-Configuration
(B) S-Configuration
(C) E-Configuration
(D) C-Configuration
7. : _______ is not a priority rule for R, S-Configuration.
(A) To the chiral centre are all different, priority depends on the atomic number if the four atoms attached, with the atom of lower atomic numbers getting lower priority
(B) To chiral centre are same if the two atoms attached, the atoms attached to every one of these first atoms are compared
(C) To the chiral centre are all different if the four atoms attached, priority depends on atomic number, with the atom of higher atomic numbers getting lower priority
(D) Both atoms are considered to be duplicated or triplicated when there is a double bond or triple bond
8. : By working with which one the exhausted anion exchangers can be regenerated?
(A) Acid solution
(B) Alcohol solution
(C) Alkali solution
(D) Water
9. : _____ gives linear chain silicones on polymerisation by controlled hydrolysis.
(A) Tetramethyl silicon chloride
(B) Trimethyl silicon chloride
(C) Momethyl silicon chloride
(D) Dimethyl silicon chloride
10. : Which of the following is the external treatment of water does not include?
(A) Lime-soda process
(B) Zeolites
(C) Sequestration
(D) Ion-exchange process
11. : In the main backbone, chain silicones are called inorganic polymers due to the absence of which one?
(A) Nitrogen atom
(B) Oxygen atom
(C) Carbon atom
(D) Hydrogen atom
12. : In having a high % of which silicones resemble inorganic polymers?
(A) Controlled hydrolysis
(B) Organic groups on silicon atoms
(C) Solubility
(D) Ionic character of Si-O bond
13. : Which of the following is the according to the selection rules, the decreasing order of preference?
-CH(CH₃)₂ > -C₆H₅ > -H” onclick=”checkAnswer(‘q13’, ‘–NH₂ > -C₆H₅ > -CH(CH₃)₂ > -H’)”> (A) –NH₂ > -CH(CH₃)₂ > -C₆H₅ > -H
-C₆H₅ > -H > -NH₂” onclick=”checkAnswer(‘q13’, ‘–NH₂ > -C₆H₅ > -CH(CH₃)₂ > -H’)”> (B) –CH(CH₃)₂ > -C₆H₅ > -H > -NH₂
-CH(CH₃)₂ > –NH₂ > -H” onclick=”checkAnswer(‘q13’, ‘–NH₂ > -C₆H₅ > -CH(CH₃)₂ > -H’)”> (C) -C₆H₅ > -CH(CH₃)₂ > –NH₂ > -H
-C₆H₅ > -CH(CH₃)₂ > -H” onclick=”checkAnswer(‘q13’, ‘–NH₂ > -C₆H₅ > -CH(CH₃)₂ > -H’)”> (D) –NH₂ > -C₆H₅ > -CH(CH₃)₂ > -H
14. : ______ conditioning method is not used in internal treatment.
(A) Calgon
(B) Bicarbonate
(C) Carbonate
(D) Colloidal
15. : The viscosity of polysiloxanes which one on increasing the temperature?
(A) Decreases
(B) Remain constant
(C) Increases
(D) First increases then decrease
16. : ________ is mono-functional.
(A) Dimethyl silicon chloride
(B) Momethyl silicon chloride
(C) Trimethyl silicon chloride
(D) Tetramethyl silicon chloride